Impeller blade based on tail fin fish scale bionic structure and impeller with impeller blade

Abstract

The invention discloses an impeller blade based on a tail fin fish scale bionic structure and an impeller with the same, the impeller blade based on the tail fin fish scale bionic structure comprises a blade body, and the blade body is provided with a front edge part and a rear edge part; the end, away from the front edge part, of the rear edge part is provided with a broadening section, the width size of the broadening section is gradually increased in the direction from the front edge part to the rear edge part, and the rear edge part is provided with a plurality of grooves sequentially formed in the width direction of the rear edge part so that the rear edge part can be of a tail fin fish scale bionic structure. According to the impeller blade based on the tail fin fish scale bionic structure, flow control can be achieved on the basis of the bionic surface structure, the flow characteristic of fluid on the rear edge of the blade is improved, smooth transition of the fluid on the tail edge is promoted, vortex falling is reduced, flow resistance is reduced, and noise in the operation process of a vane pump can be effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid machinery, and in particular relates to an impeller blade based on a caudal fin fish scale bionic structure and an impeller having the same. Background Art

[0002] As human beings continue to explore the nature, bionic structure drag reduction and noise reduction technology has been rapidly developed and widely used. Among them, fish have become an important research object in drag reduction and noise reduction bionics because of their rapidity and concealment in the water. After a long period of evolution, the tail fin structure has formed a highly optimized form to adapt to the complex water flow environment. The tail fin not only has excellent propulsion performance, but also can effectively reduce water flow resistance and improve swimming efficiency. The shape changes of the tail fin scales and the surface texture and other characteristics play a vital role in its flow control in the water.

[0003] The blades in the related art have large flow resistance and are prone to generate large noise when rotating with the impeller, and the fluid flow performance is poor. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes an impeller blade based on a tail fin fish scale bionic structure capable of improving fluid flow characteristics at the trailing edge of the blade.

[0006] An embodiment of the present invention further provides an impeller.

[0007] The impeller blade based on the caudal fin fish scale bionic structure of the embodiment of the present invention comprises a blade body, wherein the blade body has a leading edge portion and a trailing edge portion;

[0008] The end of the trailing edge portion away from the leading edge portion has a widened section, the width of which gradually increases in the direction from the leading edge portion to the trailing edge portion, and the trailing edge portion has a plurality of grooves arranged in sequence along its width direction, so that the trailing edge portion presents a tail fin fish scale bionic structure.

[0009] The impeller blade based on the caudal fin fish scale bionic structure proposed in the embodiment of the present invention can achieve flow control based on the bionic surface structure, improve the fluid flow characteristics at the trailing edge of the blade, promote the smooth transition of the fluid at the trailing edge, reduce vortex shedding, reduce flow resistance, and effectively reduce the noise during the operation of the vane pump.

[0010] In some embodiments, both sides of the widened section in the width direction are in the shape of a sine curve.

[0011] In some embodiments, the width dimension b of the widening section is sinThe change in the length direction of the trailing edge portion satisfies:

[0012]

[0013] in, b0 is the minimum width dimension of the widened section at one end close to the leading edge portion.

[0014] In some embodiments, the maximum width dimension b of the widening section sin1 It is 1.15b0~1.35b0, and the length of the widening section is 0.15b0~0.3b0.

[0015] In some embodiments, a groove depth of the groove gradually increases along a direction from the leading edge portion to the trailing edge portion.

[0016] In some embodiments, the plurality of grooves are configured as sinusoidal grooves that follow a sinusoidal curve.

[0017] In some embodiments, the maximum groove depth of the sinusoidal groove is A, and the sinusoidal curve obeyed by the sinusoidal groove satisfies:

[0018] A = (0.3-0.6) δ;

[0019] λ=0.15b0~0.3b0;

[0020] Wherein, A is the amplitude of the sine curve obeyed by the sinusoidal groove, δ is the thickness of the trailing edge portion, λ is the wavelength of the sine curve obeyed by the sinusoidal groove, and b0 is the minimum width dimension of one end of the widening section close to the leading edge portion.

[0021] In some embodiments, the groove depth at one end of the groove away from the leading edge portion is A, and the groove depth of the groove gradually decreases to zero from the end away from the leading edge portion to the end close to the leading edge portion;

[0022] and / or, the groove is configured to be arranged at the trailing edge portion along a tangential direction of rotation of the blade body;

[0023] And / or, one end of the groove extends to an end of the trailing edge portion close to the leading edge portion, and the other end of the groove extends to an end of the trailing edge portion away from the leading edge portion.

[0024] In some embodiments, the groove is located at the trailing edge of the suction side of the blade body;

[0025] And / or, the length dimension of the trailing edge portion is 10% to 15% of the total length of the blade body.

[0026] The impeller of the embodiment of the present invention comprises the impeller blade based on the caudal fin fish scale bionic structure as described in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of an impeller blade based on a caudal fin fish scale bionic structure according to an embodiment of the present invention.

[0028] Figure 2 is a schematic diagram of the prototype impeller blade.

[0029] Figure 3 It is a schematic diagram of an impeller blade based on a caudal fin fish scale bionic structure according to another embodiment of the present invention.

[0030] Figure 4 It is a stereoscopic view of the trailing edge of an impeller blade based on the tail fin fish scale bionic structure according to an embodiment of the present invention.

[0031] Reference numerals:

[0032] 100. Impeller blades;

[0033] 1. Blade body; 11. Blade leading edge; 12. Blade trailing edge; 13. Blade top; 14. Blade root; 15. Suction surface; 16. Pressure surface;

[0034] 2. Front edge;

[0035] 3. trailing edge; 31. widening section; 32. groove. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0037] like Figure 1 As shown, the impeller blade 100 based on the caudal fin fish scale bionic structure of the embodiment of the present invention includes a blade body 1, and the blade body 1 has a leading edge portion 2 and a trailing edge portion 3. It should be understood that the blade body 1 has a suction surface 15 and a pressure surface 16 arranged opposite to each other, and the suction surface 15 and the pressure surface 16 of the blade body 1 have a blade leading edge 11, a blade trailing edge 12, a blade top 13 and a blade root 14 in the circumferential direction, wherein the leading edge portion 2 is close to the blade leading edge 11 of the blade body 1, and the trailing edge portion 3 is close to the blade trailing edge 12 of the blade body 1.

[0038] The end of the trailing edge portion 3 away from the leading edge portion 2 has a widened section 31, and the width of the widened section 31 gradually increases in the direction from the leading edge portion 2 to the trailing edge portion 3. That is to say, a partial section of the trailing edge portion 3 is constructed as a section with gradually increasing lateral width, simulating the width change of the tail fin. At the same time, the trailing edge portion 3 has a plurality of grooves 32 arranged in sequence along its width direction, and protrusions are formed between adjacent grooves 32. By arranging a plurality of grooves 32 in a certain pattern on the trailing edge portion 3, the fin rays in the tail fin can be simulated, so that the trailing edge portion 3 has a tail fin fish scale bionic structure.

[0039] The embodiment of the present invention draws on the shape and surface texture of the main fin rays of the caudal fin scales, optimizes the lateral widening design at the trailing edge of the blade body 1, and sets a plurality of longitudinal grooves to simulate the shape of the caudal fin scales. The caudal fin scale bionic structure of the embodiment of the present invention is arranged at the trailing edge of the blade along the flow direction, forming a bionic blade trailing edge with a diversion function.

[0040] In application, the fish scale bionic structure of the tail fin can improve the characteristics of fluid flow, promote smooth transition of the fluid at the trailing edge, reduce vortex shedding, and reduce flow resistance. It can effectively reduce the noise during the operation of the vane pump. During the rotation of the impeller, it can suppress the impeller pressure pulsation and improve the performance of the impeller.

[0041] Furthermore, the width direction mentioned in the embodiment of the present invention is Figure 1 The width direction shown in the figure refers to the width direction shown in the figure.

[0042] In some embodiments, both sides of the widening section 31 in the width direction are in the shape of a sine curve, and both sides of the widening section 31 in the width direction are extended outward relative to the blade body 1 to increase the width of the widening section 31. In order to further optimize the bionic morphology and improve the performance of fluid flow control, in the embodiment of the present invention, the width of the widening section 31 in the length direction changes in accordance with a sine curve, and the side of the widening section 31 in the width direction can be in the shape of a sine curve.

[0043] Optionally, the widening sections 31 are arranged substantially symmetrically in the width direction, that is, the trailing edge portion 3 of the blade body extends outward on both sides in the width direction, so that the shape of the trailing edge portion 3 is more consistent with the shape of the tail fin.

[0044] Furthermore, the width dimension b of the widening section 31 is sin The change in the length direction of the trailing edge 3 satisfies:

[0045]

[0046] in, b0 is the width dimension of the widened section 31 at one end close to the leading edge portion 2 .

[0047] The length direction mentioned in the embodiment of the present invention is Figure 1 The length direction shown in Figure 1 Dimensions in the length direction shown in .

[0048] The maximum width dimension b of the widening section in the embodiment of the present invention is sin1 It is 1.15b0~1.35b0, and the length of the widening section is 0.15b0~0.3b0.

[0049] Specifically, the maximum width dimension b of the widening section 31 is sin1 It can be 1.15b0, 1.17b0, 1.19b0, 1.2b0, 1.25b0, 1.3b0 or 1.35b0. When the maximum width of the widening section 31 is too small and less than 1.15b0, the change in the flow characteristics of the fluid is small and it is not easy to produce obvious effects. When the maximum width of the widening section 31 is too large and less than 1.35b0, it is easy to cause the size of the trailing edge to be too large, affecting the overall size structure of the blade and affecting the overall performance of the blade. The embodiment of the present invention can better optimize and improve the performance of the blade and improve the overall performance of the blade by reasonably controlling the maximum width size range of the widening section.

[0050] The length dimension of the widening section 31 is 0.15b0, 0.17b0, 0.2b0, 0.22b0, 0.245b0, 0.25b0, 0.27b0 or 0.3b0. When the length dimension of the widening section 31 is less than 0.15b0, the proportion of the widening section to the total length of the blade body is too small, and the ability to control the flow direction of the fluid is weak. When the maximum width dimension and the minimum width dimension of the widening section are constant, the length-to-width ratio of the widening section is too small. When the length dimension of the widening section 31 is greater than 0.3b0, the length-to-width ratio of the widening section is relatively too large, and it is not easy to optimize and adjust the airflow at the trailing edge.

[0051] The embodiment of the present invention can reasonably constrain the maximum width dimension and the length dimension of the widened section, and can combine with the structure of the blade body itself and the fluid characteristics in actual applications while simulating the bionic structure of the tail fin fish scales, thereby improving the optimization effect of the fluid flow characteristics of the trailing edge of the blade body.

[0052] As Figure 2 The prototype impeller blades shown are modified as follows Figure 1Taking the impeller blade 100 based on the caudal fin fish scale bionic structure as an example, the number of blades in the prototype impeller is 3 to 20, the thickness of the trailing edge of the prototype impeller blade is δ=1~8mm, and the width of the trailing edge of the prototype impeller blade is b0=10~20mm. By improving the trailing edge portion 3 with the caudal fin fish scale bionic structure, the fluid flow characteristics of the trailing edge of the blade are optimized.

[0053] Specifically, Figure 1 The length direction shown in is taken as the X direction, and the width direction is taken as the Z direction. Figure 3 The plane rectangular coordinate system XZ shown in the figure, on the XZ plane, with the prototype impeller blade length L1 and the prototype impeller blade trailing edge width b0 as reference, the blade body 1 is widened from the starting position, wherein the starting position is L=L1-0.2b0, and the width dimension b of the trailing edge portion 3 (i.e., the end of the widening section 31 close to the leading edge portion 2) at the starting position is sin0 The value is b0; taking the trailing edge width b0 of the prototype impeller blade as a reference, at the trailing edge 12L=L1 position of the blade body 1, the blade body 1 is widened to the maximum width, and the maximum blade width b sin1 for b sin1 =1.25b0; the widening section 31 of the blade trailing edge 12 is transversely widened from the starting position to the blade trailing edge 12, the blade width b sin The corresponding blade length L obeys the sine curve distribution law, and the control law is:

[0054] Where x = L1-L, the value range is

[0055] The size parameters of the impeller blade 100 based on the caudal fin fish scale bionic structure in the embodiment of the present invention can be obtained through the size parameters of the prototype impeller blade, and the optimization of the fluid flow characteristics of the trailing edge can be achieved.

[0056] In some embodiments, the depth of the groove 32 gradually increases from the leading edge portion 2 to the trailing edge portion 3. The groove 32 is formed by a concave portion of the end surface of the trailing edge portion 3. Figure 1 The groove 32 extends in the longitudinal direction shown in FIG. 1 , and the depth of the end of the groove 32 close to the leading edge portion 2 gradually increases from 0 and reaches a maximum at the end of the groove 32 away from the leading edge portion 2 .

[0057] Meanwhile, the groove 32 in the embodiment of the present invention is configured to be arranged at the trailing edge portion 3 along the tangential direction of rotation of the blade body 1 .

[0058] Optionally, one end of the groove 32 extends to an end of the trailing edge portion 3 close to the leading edge portion 2, and the other end of the groove 32 extends to an end of the trailing edge portion 3 away from the leading edge portion 2. In other words, the groove 32 can cover the trailing edge portion 3 at Figure 1The entire area in the length direction shown in .

[0059] Furthermore, the length of the trailing edge portion 3 is 10% to 15% of the total length of the blade body 1. That is, if the total length of the blade body 1 is L1, then the trailing edge portion 3 is Figure 1 The dimension S in the length direction shown in FIG. 1 is 10% L1 to 15% L1.

[0060] For example, the length dimension of the trailing edge portion 3 is 10%, 11%, 12.5%, 14%, 14.3% or 15% of the total length of the blade body 1. When the length dimension of the trailing edge portion 3 is greater than 15% or less than 10%, it is easy to cause poor fluid flow control effect. The embodiment of the present invention can optimize the fluid flow characteristics and improve the performance of the impeller blades by proportionally constraining the length dimension of the trailing edge portion 3.

[0061] like Figure 4 As shown, in order to further optimize the trailing edge portion 3 and improve the flow characteristics of the fluid, in the embodiment of the present invention, a plurality of grooves 32 are located at the trailing edge portion 3 on the suction side of the blade body 1, and the plurality of grooves 32 are configured as sinusoidal grooves that obey a sinusoidal curve change. The maximum groove depth of the sinusoidal groove is A, and the groove depth gradually decreases from A to zero along the blade contour line, and the sinusoidal curve obeyed by the sinusoidal groove satisfies:

[0062] A = (0.3-0.6) δ;

[0063] λ=0.15b0~0.3b0;

[0064] Wherein, A is the amplitude of the sine curve followed by the sinusoidal groove, δ is the thickness of the trailing edge portion 3 , λ is the wavelength of the sine curve followed by the sinusoidal groove, and b0 is the minimum width dimension of the widening section 31 at one end close to the leading edge portion 2 .

[0065] A can be 0.3δ, 0.35δ, 0.43δ, 0.5δ, 0.56δ or 0.6δ, and λ can be 0.15b0, 0.18b0, 0.2b0, 0.23b0, 0.24b0, 0.25b0, 0.27b0 or 0.3b0. The embodiment of the present invention optimizes the arrangement of multiple grooves by reasonably controlling the amplitude and wavelength of the sine curve obeyed by the sine grooves, so that the flow of the trailing edge fluid is smoother, and the grooves can be used to adjust and control the trailing edge fluid to optimize the flow characteristics of the trailing edge fluid.

[0066] right Figure 2 When the prototype impeller blade shown is optimized and improved, the main parameters of the sinusoidal curve obeyed by the sinusoidal groove can be obtained based on the size of the prototype impeller blade, thereby providing more accurate parameter data for the design of the groove 32, so that it can more effectively simulate the shape and surface texture that are closer to the tail fin shape, thereby improving the control performance of the fluid flow.

[0067] The embodiment of the present invention optimizes the structure at the trailing edge of the blade body 1, and designs and optimizes the parameters of the width of the trailing edge portion 3 and the parameters of the groove 32. This not only facilitates processing and manufacturing and mass production, but also can more effectively simulate the shape of the tail fin and detailed features such as surface texture, thereby improving the fluid flow characteristics of the trailing edge 12 of the blade.

[0068] As a specific embodiment, in the impeller blades of the embodiment of the present invention, the number of impeller blades is 3 to 20, the trailing edge thickness of the impeller blade is δ=1 to 8 mm, the width dimension of the widening section in the trailing edge of the impeller blade gradually increases from b0 to 1.25b0, wherein b0=10 to 20 mm, and the width dimension b of the widening section 31 is sin The change in the length direction of the trailing edge portion 3 obeys the sine curve distribution law. The maximum groove depth of the groove of the trailing edge portion in the embodiment of the present invention is (0.3-0.6)δ, and the groove depth of the groove gradually increases from 0 to (0.3-0.6)δ along the direction from the leading edge portion 2 to the trailing edge portion 3, and the plurality of grooves are sinusoidal grooves that obey the sinusoidal curve change in the above embodiment.

[0069] Therefore, the impeller blades in the embodiment of the present invention can not only simulate the tail fin structure more accurately, and can characterize the shape changes and surface texture characteristics of the tail fin scales, but the blade body has a highly optimized tail fin scale bionic morphology to adapt to the complex fluid environment, so that the blade body has excellent propulsion performance during the rotation of the impeller, and can also effectively reduce fluid resistance and improve fluid flow control performance.

[0070] The impeller of the embodiment of the present invention includes the impeller blade 100 based on the caudal fin fish scale bionic structure in any of the above embodiments. The beneficial effects achieved by the impeller of the embodiment of the present invention at least include the beneficial effects achieved by the impeller blade 100 based on the caudal fin fish scale bionic structure in any of the above embodiments, so they are not repeated here.

[0071] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0073] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0075] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0076] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An impeller blade based on a caudal fin fish scale bionic structure, characterized in that: A blade body is included, wherein the blade body has a leading edge portion and a trailing edge portion; The end of the trailing edge portion away from the leading edge portion has a widened section, the width of which gradually increases in the direction from the leading edge portion to the trailing edge portion, and the trailing edge portion has a plurality of grooves arranged in sequence along its width direction, so that the trailing edge portion presents a tail fin fish scale bionic structure.

2. The impeller blade based on the caudal fin fish scale bionic structure according to claim 1, characterized in that: Both sides of the widened section in the width direction are in the shape of sine curves.

3. The impeller blade based on the caudal fin fish scale bionic structure according to claim 1 or 2, characterized in that: The width dimension b of the widened section sin The change in the length direction of the trailing edge portion satisfies: in, b0 is the width dimension of one end of the widened section close to the leading edge portion.

4. The impeller blade based on the caudal fin fish scale bionic structure according to claim 3, characterized in that: The maximum width dimension b of the widening section sin1 It is 1.15b0~1.35b0, and the length of the widening section is 0.15b0~0.3b0.

5. The impeller blade based on the caudal fin fish scale bionic structure according to claim 1, characterized in that: The groove depth of the groove gradually increases along the direction from the leading edge portion to the trailing edge portion.

6. The impeller blade based on the caudal fin fish scale bionic structure according to claim 5, characterized in that: The plurality of grooves are configured as sinusoidal grooves that follow a sinusoidal curve variation.

7. The impeller blade based on the caudal fin fish scale bionic structure according to claim 6, characterized in that: The maximum groove depth of the sinusoidal groove is A, and the sinusoidal curve obeyed by the sinusoidal groove satisfies: A = (0.3-0.6) δ; λ=0.15b0~0.3b0; Wherein, A is the amplitude of the sine curve obeyed by the sinusoidal groove, δ is the thickness of the trailing edge portion, λ is the wavelength of the sine curve obeyed by the sinusoidal groove, and b0 is the minimum width dimension of one end of the widened section close to the leading edge portion.

8. The impeller blade based on the caudal fin fish scale bionic structure according to claim 7, characterized in that: The groove depth at one end of the groove away from the leading edge portion is A, and the groove depth of the groove gradually decreases to zero from the end away from the leading edge portion to the end close to the leading edge portion; and / or, the groove is configured to be arranged at the trailing edge portion along a tangential direction of rotation of the blade body; And / or, one end of the groove extends to an end of the trailing edge portion close to the leading edge portion, and the other end of the groove extends to an end of the trailing edge portion away from the leading edge portion.

9. The impeller blade based on the caudal fin fish scale bionic structure according to any one of claims 5 to 8, characterized in that: The groove is located at the trailing edge of the suction side of the blade body; And / or, the length dimension of the trailing edge portion is 10% to 15% of the total length of the blade body.

10. An impeller, characterized in that: The impeller blade comprises the impeller blade based on the tail fin fish scale bionic structure as claimed in any one of claims 1 to 9.

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