CN118030341A - Blade based on bionic shark placoid scale structure and impeller with same - Google Patents

Abstract

The invention discloses a blade based on a bionic shark shield scale structure and an impeller with the same. According to the blade based on the bionic shark shield scale structure, the plurality of protrusions are arranged on the surface of the blade body, and the fluid grooves extending along the extending direction of the blade body are formed between two adjacent protrusions, so that fluid on the surface of the blade can flow in the fluid grooves along the extending direction of the fluid grooves, the stability of fluid flow can be improved, the turbulent flow characteristic of the surface of the blade can be improved, and the overall performance of the impeller can be improved.

Description

Blade based on bionic shark shield scale structure and impeller having the same

Technical Field

The invention relates to the technical field of hydraulic machinery, and in particular to a blade based on a bionic shark shield scale structure and an impeller having the same.

Background technique

In recent years, with the continuous deepening of human exploration of nature, bionic surface drag reduction technology has been rapidly developed and widely used. Among them, sharks have become an important research object in drag reduction bionics because of their rapidity and concealment in the water. The reason why sharks have fast and flexible swimming characteristics is closely related to the shield scales covering their body surface. The groove structure on the surface of this shield scale can improve the fluid structure and flow state of the turbulent boundary layer, thereby effectively reducing water resistance and obtaining extremely high swimming speeds. In related technologies, when the blades in the impeller rotate to do work, the fluid flow velocity on the blade surface increases, increasing the uncertainty of the fluid flow direction, causing turbulence to easily occur in the flow channel, increasing the flow resistance of the fluid, and increasing the flow noise of the fluid. Therefore, how to improve the turbulent characteristics of the blade surface has a certain research space.

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a blade based on a bionic shark shield scale structure, which can improve the turbulence characteristics of its surface and improve the overall performance of the impeller.

The present invention also provides an impeller having blades based on a bionic shark shield scale structure.

According to the blade based on the bionic shark shield scale structure of the first aspect of the embodiment of the present invention, the blade includes a blade body and a plurality of drag reduction modules, the plurality of drag reduction modules are arranged on at least one side of the blade body, the plurality of drag reduction modules are arranged in sequence along the extension direction of the blade body, and each of the drag reduction modules includes a plurality of drag reduction units, a plurality of protrusions are formed on the outer surface of each of the drag reduction units, a fluid groove is formed between two adjacent protrusions, and the fluid groove passes through the drag reduction unit along the extension direction of the blade body.

According to the blade based on the bionic shark shield scale structure of the embodiment of the present invention, a plurality of protrusions are arranged on the surface of the blade body, and a fluid groove extending along the extension direction of the blade body is formed between two adjacent protrusions, so that the fluid on the blade surface can flow in the fluid groove along the extension direction of the fluid groove, which can improve the stability of the fluid flow, is beneficial to improving the turbulent characteristics of the blade surface, and reduces the probability of turbulence in the flow channel, thereby reducing the flow resistance of the fluid, reducing the flow noise of the fluid, reducing the work loss of the blade, and improving the working efficiency of the blade, thereby improving the overall performance of the impeller.

According to some embodiments of the present invention, the protrusion has a first side and a second side arranged opposite to each other, the first side and the second side of each protrusion intersect, and the first side of one of two adjacent protrusions and the second side of the other of two adjacent protrusions intersect to form the fluid groove.

In some examples, the first side surface and the second side surface are both straight inclined surfaces.

In some examples, a plurality of planes are defined, each of the drag reduction units is symmetrical along one of the planes, and an intersection line of the first side surface and the second side surface of a protrusion is located on the plane, and the highest heights of the plurality of protrusions gradually decrease in a direction away from the plane.

According to some embodiments of the present invention, each of the drag reduction units includes a base and a plurality of the protrusions, the plurality of the protrusions are arranged on the base, and the height of the base is h ₀ ; the plurality of the protrusions include a first protrusion, two second protrusions and two third protrusions, the height of the first protrusion is h ₃ , the two second protrusions are symmetrically arranged and have a height of h ₂ , the two third protrusions are symmetrically arranged and have a height of h ₁ , the second protrusion is located between the first protrusion and the third protrusion, and the lowest height of the fluid groove between the second protrusion and the third protrusion is c, wherein h _n =c+nh ₀ (n=1, 2, 3).

In some examples, the height of the substrate is h ₀ , 0≤h ₀ ≤100 μm.

According to some embodiments of the present invention, along the extension direction of the blade body, the length of the drag reduction unit is b, 400 μm≤b≤800 μm.

According to some embodiments of the present invention, the width of the drag reduction unit is a, 400 μm≤a≤800 μm.

In some examples, along the extension direction of the blade body, the protrusions of the drag reduction units of two adjacent drag reduction modules are staggered.

The impeller with blades based on a bionic shark shield scale structure according to the second embodiment of the present invention includes the blades based on a bionic shark shield scale structure according to the first embodiment of the present invention. By adopting the above-mentioned blades, the fluid on the surface of the blade can flow in the fluid groove along the extension direction of the fluid groove, which can improve the stability of the fluid flow, help improve the turbulent characteristics of the blade surface, and reduce the probability of turbulence in the flow channel, thereby reducing the flow resistance of the fluid, reducing the flow noise of the fluid, and improving the working efficiency of the impeller, thereby improving the overall performance of the impeller.

Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG1 is a schematic diagram of a partial structure of an impeller according to some embodiments of the present invention;

FIG2 is a schematic diagram of the structure of a drag reduction module according to some embodiments of the present invention;

FIG3 is a schematic structural diagram of a drag reduction unit according to some embodiments of the present invention;

FIG4 is a schematic structural diagram of a drag reduction unit at a viewing angle according to some embodiments of the present invention;

FIG. 5 is a schematic structural diagram of a drag reduction unit according to some embodiments of the present invention at another viewing angle.

Reference numerals:

Blade 100, impeller 200,

The blade body 10,

Drag reduction module 20, drag reduction unit 21, first protrusion 211, second protrusion 212, third protrusion 213, base 214,

Fluid groove 30 , first side surface 31 , and second side surface 32 .

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

The following describes a blade 100 based on a bionic shark shield scale structure according to an embodiment of the present invention with reference to FIGS. 1 to 5 .

As shown in Figures 1 to 5, according to the blade 100 based on the bionic shark shield scale structure of an embodiment of the present invention, the blade 100 includes a blade body 10 and a plurality of drag reduction modules 20. The plurality of drag reduction modules 20 can be arranged on at least one side of the blade body 10, that is, the plurality of drag reduction modules 20 are arranged on the surface of the blade body 10. Taking the extension direction of the blade body 10 shown in Figure 1 as the up and down direction in Figure 2 as an example, the plurality of drag reduction modules 20 can be arranged on one side of the blade body 10 (the front side as shown in Figure 2), which can reduce the flow resistance of the fluid located on the front side of the blade body 10. The plurality of drag reduction modules 20 can be respectively arranged on the opposite sides of the blade body 10 (the front side and the rear side as shown in Figure 2), which can increase the contact area between the drag reduction module 20 and the fluid and improve the drag reduction effect on the fluid.

A plurality of drag reduction modules 20 are arranged in sequence along the extension direction of the blade body 10 (the up and down direction as shown in FIG. 2 ), and each drag reduction module 20 includes a plurality of drag reduction units 21, a plurality of protrusions are formed on the outer surface of each drag reduction unit 21, and a fluid groove 30 is formed between two adjacent protrusions, and the fluid groove 30 passes through the drag reduction unit 21 along the extension direction of the blade body 10 (the up and down direction as shown in FIG. 3 ).

As a result, the fluid on the surface of the blade 100 can flow in the fluid groove 30 to limit the flow direction of the fluid on the surface of the blade 100, which can improve the stability of the fluid flow, and the flow direction of the fluid is consistent with the extension direction of the fluid groove 30, thereby improving the turbulent characteristics of the surface of the blade 100 and reducing the probability of turbulence in the flow channel, thereby reducing the flow resistance of the fluid and improving the working efficiency of the blade 100.

According to the blade 100 based on the bionic shark shield scale structure of the embodiment of the present invention, a plurality of protrusions are arranged on the surface of the blade body 10, and a fluid groove 30 extending along the extension direction of the blade body 10 is formed between two adjacent protrusions, so that the fluid on the surface of the blade 100 can flow in the fluid groove 30 along the extension direction of the fluid groove 30, which can improve the stability of the fluid flow, is beneficial to improve the turbulent characteristics of the surface of the blade 100, and reduce the probability of turbulence in the flow channel, thereby reducing the flow resistance of the fluid, reducing the flow noise of the fluid, reducing the work loss of the blade 100, and improving the working efficiency of the blade 100, thereby improving the overall performance of the impeller 200.

As shown in Figures 3 to 5, according to some embodiments of the present invention, the protrusion has a first side surface 31 and a second side surface 32 that are arranged opposite to each other, and the first side surface 31 and the second side surface 32 of each protrusion intersect with each other, that is, in the direction of the drag reduction unit 21 away from the blade body 10 (the direction from back to front as shown in Figure 3), the first side surface 31 and the second side surface 32 of each protrusion are close to each other, which can increase the opening size of the fluid groove 30 to facilitate the fluid on the surface of the blade 100 to flow through the fluid groove 30.

In two adjacent protrusions, the first side surface 31 of one protrusion and the second side wall of the other protrusion intersect to form a fluid groove 30 in the two adjacent protrusions, that is, in the direction of the drag reduction unit 21 close to the blade body 10 (the direction from front to rear as shown in Figure 3), the size of the fluid groove 30 in the width direction (the left and right direction as shown in Figure 3) gradually decreases, so that the flow of the fluid at the bottom junction of the fluid groove 30 is more stable, which can improve the turbulent effect of the fluid flow.

As shown in Figures 3-5, in some examples, the first side surface 31 and the second side surface 32 can be straight inclined surfaces respectively, so that each protrusion extends in a direction away from the blade body 10 (from the back to the front as shown in Figure 3) to form a sharp corner, which can improve the guiding effect on the fluid flow, and make the bottom of the fluid groove 30 extend in a direction close to the blade body 10 (from the front to the back as shown in Figure 3) to form a sharp corner, which can improve the improvement effect on the turbulent characteristics of the surface of the blade 100 and facilitate processing.

Of course, the first side surface 31 and the second side surface 32 may also be curved surfaces, which are bent in the direction close to the blade body 10 (from front to back as shown in Figure 3), which can weaken the impact strength of the fluid on the surface of the blade 100 and reduce the load on the surface of the blade 100 when the blade 100 is doing work, which is beneficial to improving the service life of the blade 100.

As shown in FIG4 , in some examples, multiple planes are defined, each drag reduction unit 21 is symmetrical along a plane, and the intersection line of a first side surface 31 and a second side surface 32 of a protrusion in each drag reduction unit 21 is located on the plane. In the direction away from the plane, that is, with O in FIG4 as the origin, in the positive direction of the X-axis (from left to right as shown in FIG4 ) or in the negative direction of the X-axis (from right to left as shown in FIG4 ), the highest heights of the multiple protrusions gradually decrease, and the heights of the bottoms of the multiple fluid grooves 30 gradually decrease.

Furthermore, when the blade 100 rotates to do work, multiple protrusions of different heights can guide the fluid on the surface of the blade 100 respectively, so that the fluid can flow evenly in multiple fluid grooves 30, which can improve the drag reduction effect on the fluid, improve the working efficiency of the blade 100, and help reduce the working noise of the blade.

As shown in FIG. 4 , according to some embodiments of the present invention, each drag reduction unit 21 includes a base 214 and a plurality of protrusions, and the plurality of protrusions are arranged on the base 214 , that is, the drag reduction unit 21 only needs to be installed on the surface of the blade body 10 to realize the arrangement of the plurality of protrusions, which is convenient for operation.

As shown in FIG4 , in some examples, the height of the base 214 is h ₀ . If the height of the base 214 is too large, it is easy to increase the thickness of the entire blade 100 , increase the mass of the blade 100 , and affect the working efficiency of the blade 100 . Therefore, h ₀ can be limited to between 0 and 100 μm. h ₀ can be any point value among 0, 25 μm, 50 μm, 75 μm, and 100 μm, or a range value between any two of them. Therefore, based on installing a plurality of protrusions to the surface of the blade body 10 through the base 214 , it is beneficial to reduce the thickness of the blade 100 and improve the working efficiency of the blade 100 .

As shown in FIGS. 3 and 4 , according to some embodiments of the present invention, the plurality of protrusions include a first protrusion 211, two second protrusions 212 and two third protrusions 213, the first protrusion 211 is symmetrically arranged along a plane, and the height of the first protrusion 211 is h ₃ , the two second protrusions 212 are symmetrically arranged with respect to the first protrusion 211, and the height of the second protrusion 212 is h ₂ , the two third protrusions 213 are symmetrically arranged with respect to the first protrusion 211, and the height of the third protrusion 213 is h ₁ , the second protrusion 212 is located between the first protrusion 211 and the third protrusion 213, and the lowest height of the fluid groove 30 between the second protrusion 212 and the third protrusion 213 is c, wherein, h _n =c+nh ₀ (n=1, 2, 3), specifically, h ₁ =c+h ₀ , h ₂ =c+2h ₀ , h ₃ =c+3h ₀ .

As shown in Figures 3 to 5, according to some embodiments of the present invention, along the extension direction of the blade body 10 (the up and down direction as shown in Figure 5), the length of the drag reduction unit 21 is b. If the length of the drag reduction unit 21 is too long, the flow path of the fluid in the fluid groove 30 of each drag reduction unit 21 is too long, which can easily affect the stability of the fluid flow, causing turbulence to easily appear on the surface of the blade 100, and thus easily affecting the drag reduction effect of the drag reduction module 20 on the fluid. If the length of the drag reduction unit 21 is too short, the number of drag reduction units 21 that need to be arranged on the surface of the entire blade 100 is too large, affecting the convenience of installation. Therefore, b can be limited to between 400μm and 800μm. b can be any point value of 400μm, 500μm, 600μm, 700μm, 800μm, or a range value between any two of them.

In this way, the turbulent characteristics on the surface of the blade 100 can be improved, and the probability of turbulence occurring on the surface of the blade 100 can be reduced, which is beneficial to reducing the resistance to fluid flow and improving the working efficiency of the blade 100. At the same time, on the surface of the blade 100 of the same size, the number of drag reduction units 21 can be appropriately reduced for easy installation.

As shown in Figures 3 to 5, according to some embodiments of the present invention, on the surface of the blade 100, and along the extension direction perpendicular to the blade body 10 (the left and right direction as shown in Figure 3), the width of the drag reduction unit 21 is a. If the width of the drag reduction unit 21 is too large, the width of the fluid groove 30 is too large, which makes the surface of the blade 100 relatively flat, weakens the guiding effect on the fluid on the surface of the blade 100, and easily affects the stability of the fluid flow, resulting in turbulence on the surface of the blade 100, which is easy to affect the drag reduction effect of the drag reduction module 20 on the fluid. If the width of the drag reduction unit 21 is too small, the width of the fluid groove 30 is too small, resulting in difficulty for the fluid to flow in the fluid groove 30, which also makes turbulence on the surface of the blade 100 easy to occur, affecting the drag reduction effect of the drag reduction module 20 on the fluid.

Therefore, a can be limited to between 400μm and 800μm. a can be any point value among 400μm, 500μm, 600μm, 700μm, 800μm or a range value between any two of them. Thus, the turbulent characteristics of the surface of the blade 100 can be improved, and the probability of turbulence occurring on the surface of the blade 100 can be reduced, which is beneficial to reducing the resistance of fluid flow and improving the working efficiency of the blade 100.

According to some specific embodiments of the present invention, the minimum height of the fluid groove 30 between the second protrusion 212 and the third protrusion 213 can be 80 μm, the height of the base 214 can be 40 μm, and on the surface of the blade 100, along the extension direction perpendicular to the blade body 10 (the left and right direction as shown in Figure 3), the width of the drag reduction unit 21 can be 500 μm, and along the extension direction of the blade body 10 (the up and down direction as shown in Figure 5), the length of the drag reduction unit 21 can be 500 μm.

As shown in Figures 2 to 4, in some examples, along the extension direction of the blade body 10 (the up and down direction as shown in Figure 2), the protrusions of the drag reduction units 21 of two adjacent drag reduction modules 20 are staggered. For example, two adjacent drag reduction modules 20 can be projected onto the XOY coordinate system in Figure 4, and in two adjacent protrusions on the extension direction of the blade body 10 (the up and down direction as shown in Figure 2), the projection line of the first side surface 31 of one protrusion on the XOY coordinate system and the projection line of the second side surface 32 of the other protrusion on the XOY coordinate system intersect, that is, the protrusion and the fluid groove 30 correspond to each other, so that the protrusion can guide the fluid flowing through the fluid groove 30 so that the fluid is evenly distributed in multiple fluid grooves 30 when flowing, which is beneficial to improve the stability of the fluid flowing on the surface of the blade 100 and reduce the probability of turbulence on the surface of the blade 100, thereby reducing the flow resistance of the fluid and improving the working efficiency of the blade 100.

As shown in Figure 1, in some examples, the number of blades 100 is at least four and at most eight, and multiple blades 100 are arranged on the surface cover of impeller 200 at intervals along the circumference of impeller 200; in addition, the thinnest thickness of blade 100 is greater than or equal to 1 mm; specifically, the number and thickness of blades 100 can be set based on the parameters of impeller 200.

As shown in Figures 2 and 3, in some examples, the drag reduction unit 21 is integrally formed with the blade body 10, that is, a plurality of drag reduction units 21 are processed on the surface of the blade 100, which can improve the overall structural strength of the blade 100, improve the impact resistance of the blade 100, and help to increase the service life of the blade 100.

According to an embodiment of the present invention, the impeller 200 with blades based on a bionic shark shield scale structure includes a blade 100 based on a bionic shark shield scale structure. By adopting the above-mentioned blade 100, the fluid on the surface of the blade 100 can flow in the fluid groove 30 along the extension direction of the fluid groove 30, which can improve the stability of the fluid flow, help improve the turbulent characteristics of the surface of the blade 100, and reduce the probability of turbulence in the flow channel, thereby reducing the flow resistance of the fluid, reducing the flow noise of the fluid, and improving the working efficiency of the impeller 200, thereby improving the overall performance of the impeller 200.

The other structures and operations of the impeller 200 with blades based on the bionic shark shield scale structure according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here. In the description of the present invention, "first feature" and "second feature" may include one or more of these features. Among them, the up-down direction, left-right direction and front-back direction shall be based on the up-down direction, left-right direction and front-back direction shown in the figure.

In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. A blade based on a bionic shark shield scale structure, characterized in that the blade comprises a blade body and a plurality of drag reduction modules, the plurality of drag reduction modules are arranged on at least one side of the blade body, the plurality of drag reduction modules are arranged in sequence along the extension direction of the blade body, and each of the drag reduction modules comprises a plurality of drag reduction units, a plurality of protrusions are formed on the outer surface of each of the drag reduction units, a fluid groove is formed between two adjacent protrusions, and the fluid groove penetrates the drag reduction unit along the extension direction of the blade body. 2. The blade based on the bionic shark shield scale structure according to claim 1 is characterized in that the protrusion has a first side and a second side arranged opposite to each other, the first side and the second side of each protrusion intersect, and the first side of one of two adjacent protrusions and the second side of the other of two adjacent protrusions intersect to form the fluid groove. 3. The blade based on the bionic shark shield scale structure according to claim 2, characterized in that the first side surface and the second side surface are both straight inclined surfaces. 4. The blade based on the bionic shark shield scale structure according to claim 2 is characterized in that a plurality of planes are defined, each of the drag reduction units is symmetrical along one of the planes, and an intersection line of the first side surface and the second side surface of a protrusion is located on the plane, and the highest heights of the plurality of protrusions gradually decrease in a direction away from the plane. 5. The blade based on the bionic shark shield scale structure according to claim 1, characterized in that each of the drag reduction units comprises a base and a plurality of the protrusions, the plurality of the protrusions are arranged on the base, and the height of the base is h ₀ ; The plurality of protrusions include a first protrusion, two second protrusions and two third protrusions, the first protrusion has a height of h ₃ , the two second protrusions are symmetrically arranged and have a height of h ₂ , the two third protrusions are symmetrically arranged and have a height of h ₁ , the second protrusion is located between the first protrusion and the third protrusion, the lowest height of the fluid groove between the second protrusion and the third protrusion is c, Here, _hn = c + nh ₀ (n = 1, 2, 3). 6 . The blade based on the bionic shark shield scale structure according to claim 5 , characterized in that the height of the base is h ₀ , 0≤h ₀ ≤100 μm. 7. The blade based on the bionic shark shield scale structure according to claim 1 is characterized in that, along the extension direction of the blade body, the length of the drag reduction unit is b, 400 μm≤b≤800 μm. 8. The blade based on the bionic shark shield scale structure according to claim 1, characterized in that the width of the drag reduction unit is a, 400 μm≤a≤800 μm. 9. The blade based on the bionic shark shield scale structure according to any one of claims 1 to 8, characterized in that, along the extension direction of the blade body, the protrusions of the drag reduction units of two adjacent drag reduction modules are staggered. 10. An impeller having blades based on a bionic shark shield scale structure, characterized in that it comprises the blades based on a bionic shark shield scale structure according to any one of claims 1 to 9.