CN118090125B - Blowing flap type high-speed wind tunnel gust generator and generating method - Google Patents
Blowing flap type high-speed wind tunnel gust generator and generating method Download PDFInfo
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- CN118090125B CN118090125B CN202410496545.XA CN202410496545A CN118090125B CN 118090125 B CN118090125 B CN 118090125B CN 202410496545 A CN202410496545 A CN 202410496545A CN 118090125 B CN118090125 B CN 118090125B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
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- B64F5/60—Testing or inspecting aircraft components or systems
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Abstract
A blowing flap type high-speed wind tunnel gust generator and a generating method belong to the technical field of wind tunnel tests. The wing-shaped mechanism comprises a driving mechanism assembly and a wing-shaped assembly, wherein the driving mechanism assembly drives the wing-shaped assembly to swing periodically, each transmission part in the driving mechanism assembly is fixed on a mounting seat, a motor drives an eccentric wheel to rotate through a speed reducer, the eccentric wheel drives a rack to generate periodic reciprocating movement through a rack connecting piece, the rack drives a gear to realize periodic reciprocating rotation, the gear drives a gear shaft to rotate, the gear shaft drives a wing flap in the wing-shaped assembly to rotate through a wing flap coupler, and the wing flap generates periodic reciprocating rotation under the action of the driving mechanism assembly. The air supply in the air supply pipeline flows out from the air blowing groove at the rear edge of the main wing through the deep hole at the front edge of the main wing in the wing-shaped component and the circulation cavity along the chord direction of the air supply pipeline, and the gust generator generates gust in the vertical direction under the coupling action of the periodic deflection of the flap and the air blowing of the rear edge of the main wing, so that the reasonable simulation of gust disturbance in the atmosphere is realized.
Description
Technical Field
The invention relates to a blowing flap type high-speed wind tunnel gust generator and a generating method, and belongs to the technical field of wind tunnel tests.
Background
Aircraft flying in the atmosphere are often disturbed by gusts and atmospheric turbulence, which will create additional aerodynamic loads and cause the wings to vibrate in elastic modes, which will seriously affect the handling characteristics of the aircraft and the comfort of the aircraft occupants. In addition, the pulsating load caused by gust response has great influence on the ultimate load and fatigue life of the aircraft structure, and in extreme cases, the safe take-off and landing of the aircraft are influenced, and even the consequences of the death of the aircraft are caused. Therefore, wind gust load prediction and wind gust alleviation active control technology research are required to be carried out in the aircraft design stage, and the reasonable determination of the wind gust load and alleviation of the wind gust influence are of great significance in ensuring the safe flight of the aircraft.
Accurate prediction of gust loads is an important task that must be performed in modern aircraft design, and gust wind tunnel testing is an important means of performing this task. Aircraft gust wind tunnel tests have specific requirements for wind farms, generally requiring that the incoming flow in front of the aircraft be a non-constant and time-varying non-uniform flow. In order to realize the required gust environment in a wind tunnel test, a specific gust generating device is usually arranged at a wind tunnel port, a tail edge blowing type gust generator and a swinging blade type gust generator are mostly used in the existing gust generating device, the on-off condition of a plurality of groups of electromagnetic valves in the tail edge blowing type gust generator needs to be controlled according to the required working condition, a control system is complex, and the on-off of each electromagnetic valve possibly has different degrees of hysteresis due to different control signals, so that the influence on an gust field is generated; in the swinging vane type gust generator, a plurality of complete vanes are symmetrically arranged on the side wall of the wind tunnel, the rotational inertia of the vanes is large, the requirement on a driving system is high, the installation form of the vanes causes that a more obvious gust field is only generated near the side wall of the wind tunnel, and the gust field in the core flow field area of the wind tunnel is not obvious. Based on the above situation, it is needed to provide a blowing flap type high-speed wind tunnel gust generator and a generating method.
Disclosure of Invention
The invention aims to solve the problems of complex control system, high requirement on a driving system and uneven wind field of a wind tunnel flow field of the conventional wind gust generating device, and provides a blowing flap type high-speed wind tunnel wind gust generator and a generating method. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention.
The technical scheme of the invention is as follows:
Scheme one, a high-speed wind tunnel gust generator of blowing flap type: including actuating mechanism subassembly and wing section subassembly, actuating mechanism subassembly drive wing section subassembly carries out periodic oscillation, actuating mechanism subassembly includes motor, eccentric wheel crank bearing, mount pad, rack connecting piece, rack bush seat, rack bush, gear shaft bush, rack, fixed mounting has motor and rack bush seat on the mount pad, the output and eccentric wheel one side fixed connection of motor, the eccentric wheel opposite side has the eccentric wheel crank, be provided with the spout on the rack connecting piece, the eccentric wheel crank passes through eccentric wheel crank bearing to slide and sets up in the spout of rack connecting piece, rack both sides all establish sliding connection through rack bush and rack bush seat, rack one end and rack connecting piece fixed connection, the gear shaft passes through gear shaft bush and rotates to be installed on the mount pad, gear shaft one end fixed mounting has the gear, gear and rack meshing, the gear shaft other end and wing section subassembly fixed connection.
Preferably: the wing type assembly comprises a main wing front edge, a main wing rear edge, a wing flap, a main wing front and rear edge matching surface sealing ring, a wing flap coupler, a lower base and an air supply pipeline, wherein an air blowing groove is formed in the main wing rear edge, the air supply pipeline is communicated with the air blowing groove through the main wing front edge, the main wing front edge is fixedly connected with the main wing rear edge, rotating shafts are arranged at the end parts of two sides of the wing flap, the rotating shafts on one side of the wing flap penetrate through the rotating matching surfaces of the wing flap and the main wing rear edge to be assembled and then are in rotating fit with the lower base, the lower base is fixed on one side of the main wing front edge, and the rotating shafts on the other side of the wing flap penetrate through the rotating matching surfaces of the wing flap coupler and the main wing rear edge to be fixedly connected with a gear shaft.
Preferably: the main wing front edge is internally provided with a deep hole and a circulation cavity along the chord direction of the main wing front edge, the deep hole and the circulation cavity are mutually communicated, one end of an air supply pipeline is connected with the deep hole in the main wing front edge, the other end of the air supply pipeline is connected with an external air supply source, and the main wing front edge and the main wing rear edge are sealed by a main wing front edge and rear edge matching surface sealing ring, so that the circulation cavity is communicated with an air blowing groove.
Preferably: the opening width of the blowing groove is not more than 1mm.
Preferably: the driving mechanism assembly further comprises a speed reducer, an eccentric wheel coupler, an eccentric wheel bearing gland, an eccentric wheel bearing retainer ring, an eccentric wheel bearing seat and an eccentric wheel crank bearing retainer ring, wherein the speed reducer and the eccentric wheel bearing seat are fixedly arranged on the mounting seat, the eccentric wheel bearing is fixedly arranged in the eccentric wheel bearing seat through the eccentric wheel bearing gland and the eccentric wheel bearing retainer ring, the output end of the motor is connected with the input end of the speed reducer, the output end of the speed reducer passes through the eccentric wheel bearing and then is fixedly connected with one side of the eccentric wheel, and the eccentric wheel crank bearing is fixedly arranged on an eccentric wheel crank through the eccentric wheel crank bearing retainer ring.
The scheme II, a method for generating gusts of the high-speed wind tunnel of the air blowing flap type, is realized by the gust generator of the high-speed wind tunnel of the air blowing flap type according to the scheme I, comprising the following steps:
step 1, a motor drives an eccentric wheel to rotate through an eccentric wheel coupler by a speed reducer;
step 2, the eccentric wheel drives the rack to generate periodic reciprocating movement through the rack connecting piece, and then the rack drives the gear to realize periodic reciprocating rotation;
Step 3, the gear drives the gear shaft to rotate, the gear shaft drives the flap in the wing-shaped assembly to rotate through the flap coupler, and the flap generates periodic reciprocating rotation under the action of the driving mechanism assembly;
Step 4, air supply in the air supply pipeline flows out of the air blowing groove at the rear edge of the main wing after passing through the deep hole and the circulation cavity at the front edge of the main wing in the wing-shaped assembly, and generates gusts in the vertical direction under the coupling action of the periodic reciprocating rotation of the flap and the air blowing of the rear edge of the main wing, so that the reasonable simulation of the gust disturbance in the atmosphere is realized;
In the step 3, the amplitude of the rotation angle of the periodic reciprocating rotation of the flap is determined by the crank eccentric distance of the eccentric wheel, and the installation angle of the flap is adjusted by changing the relative position of the gear and the rack by changing the rack connecting piece, so that the flap generates periodic asymmetric deflection when the installation angle of the flap is pre-biased.
Preferably: the deflection frequency of the flap is determined by adjusting the rotation speed of the motor, and the air outlet flow of the air blowing groove in the rear edge of the main wing is determined by adjusting the air supply pressure in the air supply pipeline.
The invention has the following beneficial effects:
1. The driving mechanism component and the wing-shaped component in the blowing flap type high-speed wind tunnel gust generator are integrally installed, so that the difficulty in assembly is low, and the blowing flap type high-speed wind tunnel gust generator is convenient to connect with a wind tunnel;
2. according to the air blowing flap type high-speed wind tunnel gust generator, the air blowing of the rear edge of the main wing is beneficial to inhibiting the separation air flow of the flap, so that the effect of increasing the gust speed is achieved;
3. The method for generating the gust of the air blowing flap type high-speed wind tunnel has the advantages that the control mode is simple, a gust field with a wide frequency range and various forms can be generated, so that reasonable simulation of gust disturbance in the atmosphere is realized, controllable and adjustable periodic gust disturbance can be generated under the action of the method, and the gust environment required in a gust wind tunnel test is realized.
Drawings
FIG. 1 is a perspective view of a high speed wind tunnel gust generator of the present invention;
FIG. 2 is an exploded view of a high speed wind tunnel gust generator of the present invention;
FIG. 3 is a schematic diagram of the assembly of the drive mechanism assembly in a high speed wind tunnel gust generator of the present invention;
FIG. 4 is a schematic diagram of the assembly of a wing-type assembly in a high speed wind tunnel gust generator of the present invention;
FIG. 5 is an exploded view of a wing-type assembly in a high speed wind tunnel gust generator of the present invention;
FIG. 6 is a schematic structural view of a main wing leading edge deep hole and flow cavity in a wing assembly in a blowing flap type high speed wind tunnel gust generator of the present invention;
FIG. 7 is a schematic view of the structure of the main wing trailing edge blow slot in the wing assembly of the high speed wind tunnel gust generator of the present invention;
FIG. 8 is a schematic diagram of the assembly of a rack connector and an eccentric crank bearing in a high speed wind tunnel gust generator of the present invention;
FIG. 9 is a graph showing a comparison of "speed versus time" of a wind farm generated in the presence or absence of blowing at the trailing edge of a primary airfoil in accordance with one embodiment of the present invention;
FIG. 10 is a graph showing the comparison of "speed versus time" of a wind farm generated by the trailing edge of a main wing corresponding to different air slot widths under air blowing conditions in accordance with a first embodiment of the present invention.
In the figure: 1-motor, 2-reducer, 3-eccentric shaft coupling, 4-eccentric shaft bearing gland, 5-eccentric bearing retainer, 6-eccentric bearing, 7-eccentric bearing seat, 8-eccentric, 9-eccentric crank bearing, 10-eccentric crank bearing retainer, 11-mount, 12-rack connector, 13-connection fastener, 14-rack bushing seat, 15-rack bushing, 16-gear, 17-gear drive key, 18-gear shaft, 19-gear shaft bushing, 20-sleeve, 21-gear shaft bearing, 22-gear shaft bearing retainer, 23-gear shaft end key, 24-flap shaft coupling, 25-rack, 26-flap end key, 27-upper base bearing cover, 28-upper base bearing retainer, 29-upper base bearing, 30-flap, 31-main wing trailing edge, 32-main wing leading and trailing edge mating face seal ring, 33-main wing leading edge, 34-lower base bearing, 35-lower base bearing retainer, 36-lower base bearing cover, 37-lower base, 38-supply air line, 39-deep hole, 40-deep hole ventilation channel, 41-deep hole ventilation channel.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention is described below by means of specific embodiments shown in the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The connection mentioned in the invention is divided into a fixed connection and a detachable connection, wherein the fixed connection is a conventional fixed connection mode such as a non-detachable connection including but not limited to a hemmed connection, a rivet connection, an adhesive connection, a welded connection and the like, the detachable connection is a conventional detachable mode such as a threaded connection, a snap connection, a pin connection, a hinge connection and the like, and when a specific connection mode is not limited explicitly, at least one connection mode can be found in the conventional connection mode by default, so that the function can be realized, and a person skilled in the art can select the device according to needs. For example: the fixed connection is welded connection, and the detachable connection is hinged connection.
The first embodiment is as follows: 1-10, a blowing flap type high-speed wind tunnel gust generator of the present embodiment includes a driving mechanism assembly and an airfoil assembly, wherein the driving mechanism assembly drives the airfoil assembly to swing periodically;
The driving mechanism assembly comprises a motor 1, a speed reducer 2, an eccentric coupler 3, an eccentric bearing gland 4, an eccentric bearing retainer 5, an eccentric bearing 6, an eccentric bearing seat 7, an eccentric 8, an eccentric crank bearing 9, an eccentric crank bearing retainer 10, a mounting seat 11, a rack connecting piece 12, a connecting fastener 13, a rack bushing seat 14, a rack bushing 15, a gear 16, a gear transmission key 17, a gear shaft 18, a gear shaft bushing 19, a sleeve 20, a gear shaft bearing 21, a gear shaft bearing retainer 22, a gear shaft end key 23 and a rack 25.
The output end of the motor 1 is fixedly connected with one side of the eccentric wheel 8, the other side of the eccentric wheel 8 is provided with an eccentric wheel crank, the rack connecting piece 12 is provided with a chute, the eccentric wheel crank is arranged in the chute of the rack connecting piece 12 in a sliding way through the eccentric wheel crank bearing 9, both sides of the rack 25 are in sliding connection with the rack bushing seat 14 through the rack bushing 15, one end of the rack 25 is fixedly connected with the rack connecting piece 12 through the connecting fastener 13, the gear shaft 18 is rotatably arranged on the mounting seat 11 through the gear shaft bushing 19, namely, the mounting seat 11 is sequentially provided with the gear shaft bushing 19, the sleeve 20 and the gear shaft bearing 21, the gear shaft 18 passes through the gear shaft bushing 19, the sleeve 20 and the gear shaft bearing 21, and is fixedly connected with the gear shaft bearing 21 through the gear shaft bearing retainer ring 22, one end of the gear shaft 18 is fixedly provided with the gear 16 through the gear transmission key 17, the gear 16 is meshed with the rack 25, and the other end of the gear shaft 18 is fixedly connected with the wing-shaped assembly through the gear shaft end key 23;
The speed reducer 2 and the eccentric wheel bearing seat 7 are fixedly arranged on the mounting seat 11, the eccentric wheel bearing 6 is fixedly arranged in the eccentric wheel bearing seat 7 through the eccentric wheel bearing gland 4 and the eccentric wheel bearing retainer ring 5, the output end of the motor 1 is connected with the input end of the speed reducer 2, the output end of the speed reducer 2 is fixedly connected with the eccentric wheel coupler 3, the eccentric wheel coupler 3 passes through the eccentric wheel bearing 6 and then is fixedly connected with one side of the eccentric wheel 8, and the eccentric wheel crank bearing 9 is fixedly arranged on an eccentric wheel crank of the eccentric wheel 8 through the eccentric wheel crank bearing retainer ring 10.
The working process of the driving mechanism assembly in the blowing flap type high-speed wind tunnel gust generator of the present embodiment is described with reference to fig. 3 and 8. The driving mechanism assembly is integrally installed on the installation seat 11 firstly, so that the assembly difficulty is reduced. The specific working process of the driving mechanism component is that the motor 1 transmits force to the eccentric wheel 8 through the speed reducer 2 so as to drive the eccentric wheel 8 to rotate, meanwhile, an eccentric wheel crank of the eccentric wheel 8 slides in a chute of the rack connecting piece 12 to drive the rack connecting piece 12 to move left and right, and then the rack connecting piece 12 drives the rack 25 to realize periodic reciprocating movement under the sliding limitation of the rack bushing seat 14 and the rack bushing 15, the periodic reciprocating movement of the rack 25 drives the gear 16 to realize periodic reciprocating rotation, the gear 16 is connected through the gear transmission key 17 to drive the gear shaft 18 to rotate, and the gear shaft 18 drives the flap 30 in the wing section component to rotate through the flap coupler 24, so that the periodic reciprocating rotation of the flap 30 in the air blowing flap type high-speed wind tunnel gust generator in the embodiment is finally realized.
The eccentric wheel crank bearing 9 is arranged at the position of the eccentric wheel crank of the eccentric wheel 8, so that the motion state between the eccentric wheel 8 and the rack connecting piece 12 is slidable and reliable, thereby ensuring the fluency in the operation process of the driving mechanism component. A planar fit is required between the rack 25 and the rack bushing 15 to radially position the rack, thereby ensuring that no rolling occurs during the mating movement of the rack 25 and the gear 16.
The eccentric wheels 8 with different crank eccentricities L rotate to enable the racks 25 to generate displacements with different magnitudes, the gears 16 rotate by corresponding angles, and finally the flaps 30 deflect by the required angle amplitude. When the angle deflection of the flap 30 in the wing assembly has an asymmetric deflection requirement, the flap 30 needs to have a corresponding pretilt angle before periodically and reciprocally rotating, and the installation angle of the flap 30 can be realized by changing the rack connecting piece 12 and adjusting the thickness H of the rack connecting piece 12 so as to change the relative position of the rack 25 and the gear 17. When the crank of the eccentric wheel 8 is in a vertically downward position, different thicknesses H of the rack connecting piece 12 correspond to different positions of racks and gears, namely, the flap 30 corresponds to different mounting angles, and when the mounting angle of the flap 30 is pre-biased, the flap 30 can generate periodic asymmetric deflection. Furthermore, the deflection frequency of the flap 30 can be achieved by adjusting the rotational speed of the motor 1.
The airfoil assembly includes a main wing leading edge 33, a main wing trailing edge 31, a flap 30, a main wing leading and trailing edge mating surface seal ring 32, a flap coupling 24, a flap end key 26, an upper base bearing cap 27, an upper base bearing retainer 28, an upper base bearing 29, a lower base bearing cap 36, a lower base bearing retainer 35, a lower base bearing 34, a lower base 37, and an air supply duct 38.
The main wing trailing edge 31 is provided with an air blowing groove 41, the air supply pipeline 38 is communicated with the air blowing groove 41 through the main wing leading edge 33, namely, a deep hole 39 and a circulation cavity 40 along the chord direction of the main wing leading edge 33 are arranged in the main wing leading edge 33, the deep hole 39 and the circulation cavity 40 are mutually communicated, one end of the air supply pipeline 38 is connected with the deep hole 39 in the main wing leading edge 33, the other end of the air supply pipeline 38 is connected with an external air supply source, the main wing leading edge 33 is fixedly connected with the main wing trailing edge 31, and the main wing leading edge 33 and the main wing trailing edge 31 are sealed through a main wing front and rear edge matching surface sealing ring 32, so that the circulation cavity 40 is communicated with the air blowing groove 41;
The two side ends of the flap 30 are provided with rotating shafts, the rotating shafts on one side of the flap 30 pass through the rotating fit surfaces of the flap 30 and the main wing trailing edge 31 to be assembled and then are in rotating fit with the lower base 37, namely, the lower base bearing 34 is fixedly arranged in the lower base 37 through the lower base bearing cover 36, the rotating shafts on one side of the flap 30 are fixedly connected with the lower base bearing 34 through the lower base bearing retainer ring 35, the lower base 37 is fixed on the side without a vent of the main wing leading edge 33 through screws, the rotating shafts on the other side of the flap 30 pass through the rotating fit surfaces of the flap 30 and the main wing trailing edge 31 to be assembled and then are fixedly connected with the gear shaft 18 through the flap end key 26 through the flap coupler 24, the rotating fit surface of the main wing trailing edge 31 is provided with the upper base bearing 29 through the upper base bearing cover 27, and the rotating fit surface of the flap 30 is fixedly connected with the upper base bearing 29 through the upper base bearing retainer ring 28.
The assembly and operation of the wing-shaped assembly in the high-speed wind tunnel gust generator of the present embodiment of the blowing flap type will be described with reference to fig. 4, 5, 6 and 7. The leading edge 33 of the main wing is positioned by the spigot and connected by countersunk screws when assembled with the trailing edge 31 of the main wing. The flap 30 and its rotation shaft are integrated, and after the rotation shaft of the flap 30 is assembled along its rotation mating surface with the main wing trailing edge 31, the lower base 37 is fixed to the non-ventilation port side of the main wing leading edge 33 by screws. The upper base bearing 29 and the lower base bearing 34 are respectively arranged at the two ends of the flap 30 for supporting the revolute pair, so that the smooth rotation process of the flap 30 is ensured. The main wing front edge 33 is connected with the inner wall of the wind tunnel spray pipe through screws, so that the air blowing flap type high-speed wind tunnel gust generator of the embodiment is positioned above the spray pipe, and the main air supply pipeline 38 is used for supplying air, and the cross section of the circulation cavity 10 comprises, but is not limited to, a rectangle. The supply air in the air supply line 38 flows out through the deep hole 39 of the main wing leading edge 33 and the flow-through chamber 40 in the chord-wise direction thereof, and finally through the air-blowing groove 41 of the main wing trailing edge 31.
Fig. 9 is a calculated "speed-time" comparison curve of the main wing trailing edge 31 blowing and the wind field generated under the condition that the main wing trailing edge 31 does not blow in the high-speed wind tunnel gust generator according to the present embodiment, fig. 10 is a calculated "speed-time" comparison curve of the wind field generated by the main wing trailing edge 31 corresponding to the width of the different blowing slots 41 in the high-speed wind tunnel gust generator according to the present embodiment, and as can be seen from the calculation results shown in fig. 9 and 10, the effect of increasing the wind speed can be achieved by blowing the main wing trailing edge 31 in the present embodiment, and the wind speed amplitude generated by the present embodiment increases with the increase of the width of the blowing slots 41.
Therefore, in order to make the blowing flap type high-speed wind tunnel gust generator of this embodiment generate a gust field with a larger gust speed, so as to enlarge the simulative gust test working condition, on the premise of meeting the processing technology requirement, the width of the blowing slot 41 is not more than 1mm, that is, the main wing trailing edge 31 is provided with the blowing slot 41 with a width not more than 1 mm.
The air supply pipeline 38 is sealed with the deep hole of the main wing front edge 33 and the main wing rear edge 31, and the sealing modes include but are not limited to sealing rings.
The motor 1 includes, but is not limited to, a servo motor.
The eccentric wheel coupler 3 is an elastic coupler.
The eccentric wheel bearing 6, the eccentric wheel crank bearing 9, the gear shaft bearing 21, the upper base bearing 29 and the lower base bearing 34 are one of deep groove ball bearings, self-aligning ball bearings and self-aligning roller bearings.
The eccentric wheel bearing retainer 5, the eccentric wheel crank bearing retainer 10, the gear shaft bearing retainer 22, the upper base bearing retainer 28 and the lower base bearing retainer 35 comprise, but are not limited to, elastic retainers for shafts.
The flap coupling 24 includes, but is not limited to, a rigid coupling with both ends keyed.
The gear drive keys 17, gear shaft end keys 23, flap end keys 26 include, but are not limited to, flat keys.
The rack bushing 15, gear shaft bushing 19 includes, but is not limited to, copper bushing, oil-free bushing.
The attachment fasteners 13 include, but are not limited to, screw connections.
The second embodiment is as follows: the embodiment is described with reference to fig. 1 to 10, and the method for generating a blowing flap type high-speed wind tunnel gust according to the embodiment is implemented by means of the blowing flap type high-speed wind tunnel gust generator according to the first embodiment, and includes the following steps:
step 1, a motor 1 drives an eccentric wheel 8 to rotate through a speed reducer 2 and an eccentric wheel coupler 3;
Step2, the eccentric wheel 8 drives the rack 25 to generate periodic reciprocating movement through the rack connecting piece 12, and then the rack 25 drives the gear 16 to realize periodic reciprocating rotation;
Step 3, the gear 16 drives the gear shaft 18 to rotate, the gear shaft 18 drives the flap 30 in the wing-shaped assembly to rotate through the flap coupler 24, and the flap 30 generates periodic reciprocating rotation under the action of the driving mechanism assembly;
step 4, air supply in the air supply pipeline 38 flows out from the air blowing groove 41 of the main wing trailing edge 31 after passing through the deep hole 39 and the circulation cavity 40 of the main wing leading edge 33 in the wing-shaped assembly, and generates gusts in the vertical direction under the coupling action of the periodic reciprocating rotation of the flap 30 and the air blowing of the main wing trailing edge 31, so that reasonable simulation of gust disturbance in the atmosphere is realized;
In the step 3, the amplitude of the rotation angle of the periodic reciprocating rotation of the flap 30 is determined by the crank eccentricities of the eccentric wheels 8, the eccentric wheels 8 with different crank eccentricities rotate to enable the racks 25 to generate displacement with different magnitudes, the gears 16 rotate by corresponding angles, and finally the flap 30 deflects by the required angle amplitude.
By changing the rack connecting piece 12, namely changing the relative positions of the gear 16 and the gear 25, the installation angle of the flap 30 is adjusted, and when the eccentric crank is in the plumb position and is connected with different rack connecting pieces 12, the relative positions of the gear 25 and the gear 16 are changed, namely the installation angle of the flap 30 is changed. When there is a pre-deflection of the mounting angle of the flap 30, the flap 30 is deflected asymmetrically periodically.
The deflection frequency of the flap 30 is determined by adjusting the rotational speed of the motor 1, and the air outlet flow of the air-blowing slot 41 in the trailing edge 31 of the main wing is determined by adjusting the air supply pressure in the air supply line 38.
It should be noted that, in the above embodiments, as long as the technical solutions that are not contradictory can be arranged and combined, those skilled in the art can exhaust all the possibilities according to the mathematical knowledge of the arrangement and combination, so the present invention does not describe the technical solutions after the arrangement and combination one by one, but should be understood that the technical solutions after the arrangement and combination have been disclosed by the present invention.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The utility model provides a high-speed wind tunnel gust generator of wing flap formula of blowing which characterized in that: comprises a driving mechanism component and a wing-shaped component, wherein the driving mechanism component drives the wing-shaped component to swing periodically, the driving mechanism component comprises a motor (1), an eccentric wheel (8), an eccentric wheel crank bearing (9), a mounting seat (11), a rack connecting piece (12), a rack bushing seat (14), a rack bushing (15), a gear (16), a gear shaft (18), a gear shaft bushing (19) and a rack (25), the motor (1) and the rack bushing seat (14) are fixedly arranged on the mounting seat (11), the output end of the motor (1) is fixedly connected with one side of the eccentric wheel (8), the other side of the eccentric wheel (8) is provided with an eccentric wheel crank, a chute is arranged on the rack connecting piece (12), the eccentric wheel crank is arranged in the chute of the rack connecting piece (12) in a sliding way through the eccentric wheel crank bearing (9), both sides of the rack (25) are in sliding connection with the rack bushing seat (14) through the rack bushing (15), one end of the rack (25) is fixedly connected with the rack connecting piece (12), the gear shaft (18) is rotatably arranged on the mounting seat (11) through the gear shaft bushing (19), one end of the gear shaft (18) is fixedly arranged on one end of the gear (16) and the gear (25) is meshed with the rack (25), the other end of the gear shaft (18) is fixedly connected with the wing-shaped assembly;
The wing type assembly comprises a main wing front edge (33), a main wing rear edge (31), a wing flap (30), a main wing front and rear edge matching surface sealing ring (32), a wing flap coupler (24), a lower base (37) and an air supply pipeline (38), wherein an air blowing groove (41) is formed in the main wing rear edge (31), the air supply pipeline (38) is communicated with the air blowing groove (41) through the main wing front edge (33), the main wing front edge (33) is fixedly connected with the main wing rear edge (31), rotating shafts are arranged at the end parts of two sides of the wing flap (30), one side of the rotating shaft of the wing flap (30) is in rotating fit with the lower base (37) after passing through the rotating matching surface of the main wing front edge (31), the rotating shaft of the other side of the wing flap (30) is fixedly connected with a gear shaft (18) through the coupler (24) after passing through the rotating matching surface of the main wing front edge (33);
The inside of the main wing front edge (33) is provided with a deep hole (39) and a circulation cavity (40) along the chord direction of the main wing front edge, the deep hole (39) and the circulation cavity (40) are communicated with each other, one end of an air supply pipeline (38) is connected with the deep hole (39) in the main wing front edge (33), the other end of the air supply pipeline (38) is connected with an external air supply source, and the main wing front edge (33) and the main wing rear edge (31) are sealed through a main wing front and rear edge matching surface sealing ring (32) so that the circulation cavity (40) is communicated with an air blowing groove (41); the opening width of the air blowing groove (41) is not more than 1mm.
2. A blowing flap type high speed wind tunnel gust generator according to claim 1, characterized in that: the driving mechanism assembly further comprises a speed reducer (2), an eccentric wheel coupling (3), an eccentric wheel bearing gland (4), an eccentric wheel bearing retainer ring (5), an eccentric wheel bearing (6), an eccentric wheel bearing seat (7) and an eccentric wheel crank bearing retainer ring (10), wherein the speed reducer (2) and the eccentric wheel bearing seat (7) are fixedly arranged on a mounting seat (11), the eccentric wheel bearing (6) is fixedly arranged in the eccentric wheel bearing seat (7) through the eccentric wheel bearing gland (4) and the eccentric wheel bearing retainer ring (5), the output end of the motor (1) is connected with the input end of the speed reducer (2), the output end of the speed reducer (2) penetrates through the eccentric wheel bearing (6) and then is fixedly connected with one side of the eccentric wheel (8), and the eccentric wheel crank bearing (9) is fixedly arranged on an eccentric wheel (8) crank through the eccentric wheel crank bearing retainer ring (10).
3. The method for generating the gust of the air blowing flap type high-speed wind tunnel is realized by the high-speed wind tunnel gust generator of claim 2, and is characterized by comprising the following steps:
Step 1, a motor (1) drives an eccentric wheel (8) to rotate through an eccentric wheel coupler (3) by a speed reducer (2);
step 2, the eccentric wheel (8) drives the rack (25) to generate periodic reciprocating movement through the rack connecting piece (12), and then the rack (25) drives the gear (16) to realize periodic reciprocating rotation;
Step 3, the gear (16) drives the gear shaft (18) to rotate, the gear shaft (18) drives the flap (30) in the wing-shaped assembly to rotate through the flap coupler (24), and the flap (30) generates periodic reciprocating rotation under the action of the driving mechanism assembly;
Step 4, air supply in the air supply pipeline (38) flows out from the air blowing groove (41) of the main wing trailing edge (31) after passing through the deep hole (39) and the circulation cavity (40) of the main wing leading edge (33) in the wing type assembly, and vertical gusts are generated under the coupling action of periodic reciprocating rotation of the flap (30) and air blowing of the main wing trailing edge (31), so that reasonable simulation of gust disturbance in the atmosphere is realized;
In the step 3, the amplitude of the rotation angle of the periodic reciprocating rotation of the flap (30) is determined by the crank eccentricity of the eccentric wheel (8), and the installation angle of the flap (30) is adjusted by changing the relative position of the gear (16) and the rack (25) through changing the rack connecting piece (12), so that the flap (30) is periodically and asymmetrically deflected when the installation angle of the flap (30) is pre-biased.
4. A method of generating a gust in a high speed wind tunnel of the blown-in flap type as claimed in claim 3, wherein: the deflection frequency of the flap (30) is determined by adjusting the rotational speed of the motor (1), and the air outlet flow of the air blowing groove (41) in the trailing edge (31) of the main wing is determined by adjusting the air supply pressure in the air supply line (38).
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| GB940815A (en) * | 1961-07-11 | 1963-11-06 | English Electric Co Ltd | Improvements in and relating to the control of blown flaps for aircraft |
| FR2770826B1 (en) * | 1997-11-07 | 2000-01-07 | Eurocopter France | ROTOR BLADE WITH ADJUSTABLE SHUTTER |
| CN105716827B (en) * | 2014-12-03 | 2018-04-24 | 中航通飞研究院有限公司 | Amphibious aircraft blown flap model in wind tunnel |
| CN109323842A (en) * | 2018-03-16 | 2019-02-12 | 陕西飞机工业（集团）有限公司 | A kind of wind tunnel test half module model |
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| US20230322412A1 (en) * | 2022-04-07 | 2023-10-12 | General Electric Company | System and method for testing aircraft engines |
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