CN219262531U

CN219262531U - Tube plate type mixer for exhaust system of turbofan engine

Info

Publication number: CN219262531U
Application number: CN202320699961.0U
Authority: CN
Inventors: 周辉; 朱盛; 王勇; 朱迪; 张驹瑶
Original assignee: Hefei Huaqing Aero Engine Technology Co ltd
Current assignee: Hefei Huaqing Aero Engine Technology Co ltd
Priority date: 2023-03-31
Filing date: 2023-03-31
Publication date: 2023-06-27
Anticipated expiration: 2033-03-31

Abstract

The utility model discloses a tube plate type mixer for an exhaust system of a turbofan engine, which comprises a flow guiding piece and a plurality of mixed flow pipes, wherein the outer side surface of the flow guiding piece is a round table side surface or is formed by sequentially connecting a plurality of round table side surfaces, the diameter of the outer side surface of the flow guiding piece gradually increases from front to back, a flow guiding channel penetrating front to back is arranged on the flow guiding piece, the flow guiding channel is consistent with the outer side surface of the flow guiding piece, m fan-shaped through holes which are uniformly and alternately distributed in the circumferential direction are formed in the middle of the side wall of the flow guiding piece, each fan-shaped through hole gradually increases from front to back, m mixed flow pipes are fixedly arranged in the m fan-shaped through holes in a one-to-one correspondence manner, no gap exists between one mixed flow pipe and one fan-shaped through hole which are opposite, and the m mixed flow pipes are not connected with each other and do not interfere with each other and are independent of each other; the advantage is firm with the inside wall fixed mode of outer duct, does not have the clearance with the outer duct, can improve the blending rate, and pressure loss is less, and simple manufacturing process, the processing degree of difficulty is little, and machining efficiency is high.

Description

Tube plate type mixer for exhaust system of turbofan engine

Technical Field

The present utility model relates to a mixer for a turbofan engine exhaust system, and more particularly to a tube sheet mixer for a turbofan engine exhaust system.

Background

In turbofan engine applications, the mixer of the exhaust system thereof has a crucial role. The high-pressure cold air of the outer duct of the turbofan engine and the high-pressure hot air of the inner duct are mixed, so that the exhaust temperature of the turbofan engine is balanced. After the exhaust temperature of the turbofan engine is balanced, a plurality of beneficial aspects can be brought to the working of the turbofan engine, firstly, the thrust of the turbofan engine can be increased; secondly, the thermal load of the tail pipe is reduced; finally, the highest temperature of the exhaust gas is reduced due to the mixing of the exhaust gas, so that the thermal insulation and stealth of the aircraft are facilitated.

Conventional mixers for turbofan engine exhaust systems typically employ a petal configuration, commonly referred to as petal mixers. The rear end of the petal mixer is of a petal type structure, the front end of the petal mixer is arranged on the inner side wall of the outer duct, a plurality of fan-shaped sections are arranged inside and outside the petal type structure, the inner duct air is divided by the fan-shaped sections inside the petal type structure under the guidance of the petal type structure, the outer duct air is divided by the fan-shaped sections outside the petal type structure, therefore, the inner duct air and the inner duct air form staggered sectors after passing through the petal mixer, the tail nozzle blending section arranged behind the petal mixer blends the inner duct air and the outer duct air in the staggered sectors to form mixed air, and finally the mixed air is accelerated and sprayed out through the tail nozzle accelerating section.

However, the conventional mixer for the exhaust system of the turbofan engine has the following problems: 1. the front end of the petal mixer is positioned in a ring shape and is weaker than the outer side wall of the outer duct in a fixed mode, and if the petal mixer is reinforced by the rib plates, the weight is increased and the pneumatic performance is affected; 2. the petal mixer, the inner welding bead and the outer duct are provided with clear gaps, and air flowing through the gaps cannot participate in blending, so that the blending rate is not high; 3. the petal mixer can stagger part of the inner duct and the outer duct up and down, so that the phenomenon of air flow staggering can occur in the inner duct and the outer duct, and the pressure loss of the petal mixer is higher; 4. the petal mixer needs to strictly control the area of an outlet, and the petal structure is complex in bending process, so that the processing difficulty is high, and the processing efficiency is reduced.

In order to solve the problems, the turbofan engine needs to be matched with a brand new mixer, the mixer not only needs to solve the problems of complex shape of petals and high difficulty in structural design, reduces the process difficulty, but also needs to improve the mixing performance, shorten the part length and improve the performance of the engine from the mixer part.

Disclosure of Invention

The utility model aims to solve the technical problem of providing the tube plate type mixer for the exhaust system of the turbofan engine, which has the advantages of firm fixation mode with the inner side wall of the outer duct, no gap with the inner duct, capability of improving the mixing rate, small pressure loss, simple manufacturing process, small processing difficulty and high processing efficiency.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a tube sheet formula blender for turbofan engine exhaust system, includes guide piece and m mixed flow pipe, m is more than or equal to 12 and is less than or equal to 24 the whole number, the lateral surface of guide piece be a round platform side or by a plurality of round platform sides from front to back connect gradually and form, the diameter of the lateral surface of guide piece from front to back grow gradually, the cone angle of guide piece be 5 ~ 40, the guide piece on be provided with the water conservancy diversion passageway that runs through from front to back, and this water conservancy diversion passageway is unanimous with its lateral surface shape, the lateral wall middle part of guide piece seted up m circumference evenly spaced apart fan-shaped through-hole, every fan-shaped through-hole grow gradually from front to back, m mixed flow pipe one-to-one fixed mounting is in m fan-shaped through-hole, there is not the clearance between a mixed flow pipe and the fan-shaped through-hole for, m mixed flow pipe is not mutually connected, mutually independent, m mixed flow pipe is used for with the air in the water conservancy diversion passageway to the guide piece outside.

If the outer side surface of the flow guiding piece is a round table side surface, the diameter of the front end surface of the round table side surface is larger than the diameter of the rear end surface of the flow guiding piece, and if the outer side surface of the flow guiding piece is formed by sequentially connecting a plurality of round table side surfaces, the diameter of the front end surface of each round table side surface is larger than the diameter of the rear end surface of the flow guiding piece, and the diameters of the connecting positions of the two adjacent round table side surfaces are equal.

Each flow mixing pipe is fan-shaped along the radial section of the flow guiding piece, the included angles at two sides of the section of each flow mixing pipe are gradually reduced along the flow guiding direction, but the area of the section is gradually increased, and the edge angle of the outer edge of each flow mixing pipe is rounded to form an arc-shaped edge.

Every the mixed flow pipe all include bottom plate, left side board, right side board, arc and overcoat, the arc the bottom plate the left side board with right side board arrange and in proper order fixed connection according to the position of upper and lower control and enclose into the whole fan-shaped pipeline structure that is of cross-section, the arc the bottom plate the left side board with the junction of right side board form arc edge through the chamfer, along the water conservancy diversion direction, the cross-section both sides contained angle of pipeline structure reduce gradually, but the cross-section area increases gradually, the overcoat set up the pipeline structure outside, and with pipeline structure fixed connection.

Compared with the prior art, the utility model has the advantages that the front part of the flow guide piece is fixedly connected with the inner side wall of the outer duct, the rear part of the flow guide piece is fixedly connected with the tail pipe, the inner duct passes through the flow guide channel of the flow guide piece, the inlet end of the mixed flow pipe is connected with the inner duct outlet of the turbofan engine, the outlet end of the mixed flow pipe stretches into the middle part of the tail pipe of the turbofan engine, the cone angle of the flow guide piece is matched with the tail cone of the outer duct and the tail pipe, so that the flow loss of the air of the outer duct is reduced, the structural characteristics of the mixed flow pipe can know that the inner duct air 100% enters m mixed flow pipes, then the mixed flow pipe is sprayed into the tail pipe mixing section filled with the outer duct air, the outlet of the mixed flow pipe is positioned in the middle part of the tail pipe, according to the boundary layer principle in fluid mechanics, the outer duct air quantity on the wall surface of the tail pipe mixing section is small, the outer duct air quantity in the middle part is more, the inner duct air can be mixed with the outer duct air more fully, and the mixing rate is increased, and the outer duct air flows and the mixed flow loss is uniform along the flow direction of the tail pipe; the inner side wall of the inner duct of the turbofan engine and the mixed flow pipe can be connected through a flange, the guide piece can be connected with the inner side wall of the outer duct of the turbofan engine through a flange, the whole structure is firmly fixed with the inner side wall of the outer duct, the strength is high, in addition, the air outlet area is controlled through the section of the mixed flow pipe, the processing is easy, and the process is stable and easy to control.

Drawings

FIG. 1 is a perspective view of a tube sheet mixer for a turbofan engine exhaust system of the present utility model;

FIG. 2 is a front view of a tube sheet mixer for a turbofan engine exhaust system of the present utility model;

FIG. 3 is a cross-sectional view of a tube sheet mixer for a turbofan engine exhaust system of the present utility model;

FIG. 4 is a perspective view of a baffle of the tube sheet mixer for a turbofan engine exhaust system of the present utility model;

FIG. 5 is a schematic distribution of a draft tube of a tube sheet mixer for a turbofan engine exhaust system of the present utility model;

FIG. 6 is a perspective view of a draft tube of a tube sheet mixer for a turbofan engine exhaust system of the present utility model;

FIG. 7 is a schematic illustration of a tube sheet mixer for a turbofan engine exhaust system of the present utility model mounted on a turbofan engine exhaust system;

fig. 8 is a schematic diagram of a tube sheet mixer for a turbofan engine exhaust system of the present utility model mounted on a turbofan engine exhaust system.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

Embodiment one: as shown in fig. 1 to 6, a tube-plate mixer for an exhaust system of a turbofan engine comprises a flow guiding member 1 and m mixed flow pipes 2, m is an integer greater than or equal to 12 and less than or equal to 24, the outer side surface of the flow guiding member 1 is a round table side surface, the diameter of the outer side surface of the flow guiding member 1 gradually increases from front to back, the cone angle of the flow guiding member 1 is 5 degrees to 40 degrees, a flow guiding channel 3 penetrating from front to back is arranged on the flow guiding member 1, the flow guiding channel 3 is consistent with the outer side surface of the flow guiding member, m fan-shaped through holes 4 which are uniformly distributed at intervals are formed in the middle of the side wall of the flow guiding member 1, each fan-shaped through hole 4 gradually increases from front to back, m mixed flow pipes 2 are fixedly installed in the m fan-shaped through holes 4 in a one-to-one correspondence manner, no gap exists between the opposite one mixed flow pipe 2 and the fan-shaped through hole 4, the m mixed flow pipes 2 are not connected with each other and do not interfere with each other, and are mutually independent, and the m mixed flow pipes 2 are used for guiding air in the flow guiding channel 3 to the outside of the flow guiding member 1.

In this embodiment, the cross section of each mixed flow tube 2 along the radial direction of the flow guiding member 1 is in a fan shape, and the included angles at two sides of the cross section are gradually reduced along the flow guiding direction, but the cross section area is gradually increased, and the rounded corners at the edge angles of the outer edge of each mixed flow tube 2 form a circular arc edge.

In this embodiment, each flow mixing pipe 2 includes a bottom plate 21, a left side plate 22, a right side plate 23, an arc plate 24 and an outer sleeve 25, where the arc plate 24, the bottom plate 21, the left side plate 22 and the right side plate 23 are arranged according to the directions of up, down, left and right, and are sequentially and fixedly connected to form a pipeline structure with a fan-shaped cross section, and the connection parts of the arc plate 24, the bottom plate 21, the left side plate 22 and the right side plate 23 form an arc edge through rounded corners, so that the included angles at two sides of the cross section of the pipeline structure are gradually reduced along the flow guiding direction, but the area of the cross section is gradually increased, and the outer sleeve 25 is arranged outside the pipeline structure and is fixedly connected with the pipeline structure.

Embodiment two: this embodiment is substantially the same as embodiment one, except that: in this embodiment, the outer side surface of the flow guiding member 1 is formed by sequentially connecting a plurality of truncated cone side surfaces from front to back, the diameter of the front end surface of each truncated cone side surface is larger than that of the rear end surface of each truncated cone side surface, and the diameters of the connecting positions of two adjacent truncated cone side surfaces are equal.

As shown in fig. 7 and 8, when the tube plate type mixer for the exhaust system of the turbofan engine is used for the exhaust system of the turbofan engine, the front part of the guide piece 1 is fixedly connected with the inner side wall of the outer duct 5, the rear part of the guide piece 1 is fixedly connected with the tail pipe 6, the inner duct 7 passes through the guide channel 3 of the guide piece 1, the inlet end (i.e. the position with the smallest cross-section area) of the mixed flow tube 2 is connected with the outlet of the inner duct 7 of the turbofan engine, the outlet end (i.e. the position with the largest cross-section area) of the mixed flow tube 2 extends into the middle part of the tail pipe 6 of the turbofan engine, the cone angle of the guide piece 1 is matched with the tail cone of the outer duct 5 and the tail pipe 6, so as to reduce the flow loss of the air of the outer duct 5, the mixed flow tube 2 is connected with the inner side wall of the inner duct 7 of the turbofan engine through a flange, the inner side wall of the guide piece 1 is also connected with the inner side wall of the outer duct 5 through the flange, when the exhaust system of the turbofan engine works, the mixed flow tube 2 is 100% of air enters m mixed flow tubes 2 by the structural characteristics of the mixed flow tube 2, then the mixed flow tube 7 is filled with the m mixed flow tube 5, the mixed flow tube 6 is fully enters the tail pipe 5, the mixed flow 5 is mixed flow 5 by the mixed flow channel 5 according to the principle of the mixed flow channel 5, and the mixed flow channel 5 is fully enters the air channel 5, and the mixed flow channel 5 is fully enters the mixed flow channel 5, and the mixed flow channel 5 is fully enters the inner duct 5 through the inner duct 6 side of the mixed flow duct 6 and the mixed flow duct and the inner duct 6 through the inner duct and the inner duct through the mixed flow duct and the lower duct layer, whereby the pressure loss of the inner duct 7 is small. The utility model realizes the control of the air outlet area through the section of the mixed flow pipe 2, is easy to process, has stable and easy control process and high processing efficiency.

Claims

1. The utility model provides a tube sheet type blender for turbofan engine exhaust system, its characterized in that includes guide piece and m mixed flow pipe, m is the integer of 12 and less than or equal to 24, the lateral surface of guide piece be a round platform side or by a plurality of round platform sides from front to back in proper order connect formation, the diameter of the lateral surface of guide piece from front to back grow gradually, the cone angle of guide piece be 5 ~ 40, guide piece on be provided with the guide passageway that runs through from front to back, and this guide passageway is unanimous with its lateral surface shape, the lateral wall middle part of guide piece set up m circumference evenly spaced apart fan-shaped through-holes, every fan-shaped through-hole grow gradually from front to back, m mixed flow pipe one-to-one fixed mounting is in m fan-shaped through-holes, there is not the clearance between a mixed flow pipe and a fan-shaped through-hole relative, m mixed flow pipe is not continuous, mutually noninterfere, m mixed flow pipe is used for guiding the air in the guide passageway to outside the guide piece.

2. A tube-sheet mixer for exhaust system of turbofan engine according to claim 1, wherein if the outer side surface of the flow guiding member is a truncated cone side surface, the diameter of the front end surface of the truncated cone side surface is larger than the diameter of the rear end surface thereof, and if the outer side surface of the flow guiding member is formed by sequentially connecting a plurality of truncated cone side surfaces, the diameter of the front end surface of each truncated cone side surface is larger than the diameter of the rear end surface thereof, and the diameters of the junctions of the adjacent truncated cone side surfaces are equal.

3. A tube-sheet mixer for exhaust system of turbofan engine as defined in claim 1, wherein each of said flow-mixing tubes has a fan-shaped cross section along the radial direction of said flow-guiding member, and has a gradually decreasing included angle on both sides of the cross section along the direction of flow-guiding, but a gradually increasing cross-sectional area, and rounded corners at the corners of the outer edges of each of said flow-mixing tubes form circular arc-shaped edges.

4. A tube-sheet mixer for exhaust system of turbofan engine according to claim 3, wherein each of said mixing tubes comprises a bottom plate, a left side plate, a right side plate, an arc plate and a jacket, said arc plate, said bottom plate, said left side plate and said right side plate are arranged according to the directions of up, down, left and right and are fixedly connected in sequence to form a tube structure with a fan-shaped cross section, the connection parts of said arc plate, said bottom plate, said left side plate and said right side plate form an arc edge by rounding, the included angle of the two sides of the cross section of said tube structure is gradually reduced along the direction of diversion, but the cross section area is gradually increased, said jacket is arranged outside said tube structure and is fixedly connected with said tube structure.