A centrifugal impeller with grooves for inhibiting vortex shedding

Abstract

The present invention relates to the technical field of fluid machinery, and discloses a centrifugal wind wheel with a vortex shedding inhibition groove, comprising a wheel disc; a plurality of long blades, which are arranged at equal intervals in the circumferential direction at the edge of the wheel disc; a plurality of long blade pressure surface vortex shedding inhibition grooves are arranged at intervals on the pressure surface of the long blades, and a plurality of long blade suction surface vortex shedding inhibition grooves are arranged at intervals on the suction surface of the long blades; the long blade pressure surface vortex shedding inhibition grooves and the long blade suction surface vortex shedding inhibition grooves are arranged close to the long blade outlet edge; a plurality of small wings are arranged at equal intervals in the circumferential direction at the edge of the wheel disc, and are arranged staggered with the plurality of long blades; a plurality of small wing pressure surface vortex shedding inhibition grooves are arranged at intervals on the pressure surface of the small wing; the small wing pressure surface vortex shedding inhibition grooves are arranged close to the outlet edge of the small wing. The present invention improves the vortex shedding phenomenon at the suction surface of the centrifugal wind wheel blade outlet, makes the impeller outlet flow uniform, reduces the loss, and effectively improves the total pressure and wind wheel efficiency of the centrifugal wind wheel.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid machinery, and in particular to a centrifugal impeller with a vortex shedding inhibition groove. Background Art

[0002] The centrifugal fan wheel at least includes blades and a wheel disc, or includes blades, a wheel disc and a wheel cover. In practice, it is found that ordinary centrifugal fans have a relatively serious vortex shedding phenomenon at the suction surface of the blade outlet, which leads to a very uneven flow field at the impeller outlet and a clear wake structure. This leads to increased flow losses inside the impeller and reduced efficiency. Therefore, the blade structure and layout actually have a great influence on the performance of the centrifugal fan. Summary of the invention

[0003] The object of the present invention is to provide a centrifugal impeller with vortex shedding inhibition grooves to solve the problems existing in the prior art.

[0004] To achieve the above object, the present invention provides the following solution: The present invention provides a centrifugal wind wheel with a vortex shedding inhibition groove, comprising:

[0005] Roulette;

[0006] A plurality of long blades are arranged at the edge of the impeller at equal circumferential intervals; one side of the long blade is a long blade pressure surface, and the other side is a long blade suction surface; a plurality of long blade pressure surface vortex shedding inhibition grooves are arranged at intervals on the long blade pressure surface, and a plurality of long blade suction surface vortex shedding inhibition grooves are arranged at intervals on the long blade suction surface; one end of the long blade close to the center line of the impeller is the long blade leading edge, and the other end of the long blade away from the center line of the impeller is the long blade outlet edge; the long blade pressure surface vortex shedding inhibition groove and the long blade suction surface vortex shedding inhibition groove are arranged closely to the long blade outlet edge;

[0007] A plurality of winglets are arranged at the edge of the wheel disc at equal circumferential intervals and are staggered with the plurality of long blades; one side of the winglet is a winglet pressure surface and the other side is a winglet suction surface; a plurality of winglet pressure surface vortex shedding suppression grooves are arranged at intervals on the winglet pressure surface; the end of the winglet close to the center line of the wheel disc is the winglet leading edge, and the other end of the winglet away from the center line of the wheel disc is the winglet outlet edge; the winglet pressure surface vortex shedding suppression groove is arranged close to the winglet outlet edge.

[0008] Preferably, the vortex shedding suppression groove on the pressure surface of the long blade near the impeller and the vortex shedding suppression groove on the suction surface of the long blade are m in length, and the value range of m is 9 mm-12 mm;

[0009] The lengths of the plurality of vortex shedding suppression grooves on the pressure surfaces of the long blades and the vortex shedding suppression grooves on the suction surfaces of the long blades increase by 0.5 mm in sequence along a direction away from the impeller.

[0010] Preferably, the depth of the vortex shedding inhibition groove on the pressure surface of the long blade and the vortex shedding inhibition groove on the suction surface of the long blade is n, and the value of n is 0.1mm-0.5mm;

[0011] The width of the vortex shedding suppression groove on the pressure surface of the long blade and the vortex shedding suppression groove on the suction surface of the long blade is o, and the value of o is 0.1mm-0.4mm.

[0012] Preferably, the vortex shedding suppression groove on the pressure surface of the long blade and the vortex shedding suppression groove on the suction surface of the long blade located at the top are at a distance p from the top of the long blade, and the value range of p is 1.5 mm-2 mm;

[0013] The distance between the vortex shedding suppression groove on the pressure surface of the long blade and the vortex shedding suppression groove on the suction surface of the long blade located at the bottom and the root of the long blade is q, and the value range of q is 2mm-3mm.

[0014] Preferably, the length of the vortex shedding suppression groove on the winglet pressure surface close to the wheel disc is r, and the value of r is 8mm-12mm;

[0015] The lengths of the vortex shedding suppression grooves on the pressure surfaces of the winglets along a direction away from the wheel disc are increased by 0.2 mm in sequence.

[0016] Preferably, the vortex shedding suppression groove on the winglet pressure surface has a depth of s, the value of s is 0.1mm-0.3mm, and a width of t, the value of t is 0.1mm-0.4mm.

[0017] Preferably, the distance between the vortex shedding suppression groove on the pressure surface of the winglet located at the top and the top of the winglet is u, and the value range of u is 1.5mm-2mm;

[0018] The distance between the vortex shedding suppression groove on the pressure surface of the winglet located at the bottom and the root of the winglet is v, and the value range of v is 2mm-3mm.

[0019] Preferably, the length of the long blade is L1, and the length of the winglet is L2;

[0020] Among them, L1>2L2.

[0021] Preferably, the spacing angle between the winglet and the long blade is α;

[0022] The range of α is 15°-25°.

[0023] Preferably, the diameter of the wheel disc is d1, the diameter of the leading edge of the long blade is d2, and the diameter of the leading edge of the winglet is d3;

[0024] Among them, d1>d3>d2, and d3>1.2d2.

[0025] The present invention discloses the following technical effects:

[0026] The present invention improves the vortex shedding phenomenon at the suction surface of the centrifugal wind wheel blade outlet by arranging vortex shedding inhibition grooves on the blades, so as to make the flow at the impeller outlet uniform, reduce the loss, and effectively improve the total pressure and efficiency of the centrifugal wind wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a structural schematic diagram of a centrifugal wind wheel with vortex shedding inhibition grooves according to the present invention;

[0029] Figure 2 It is a top view of the present invention;

[0030] Among them, 1. wheel disc; 2. long blade; 3. winglet; 4. leading edge of long blade; 5. leading edge of winglet; 6. pressure surface of long blade; 7. suction surface of long blade; 8. pressure surface of winglet; 9. suction surface of winglet; 10. outlet edge of long blade; 11. outlet edge of winglet; 12. vortex shedding suppression groove on the pressure surface of long blade; 13. vortex shedding suppression groove on the suction surface of long blade; 14. vortex shedding suppression groove on the pressure surface of winglet. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figure 1-Figure 2 The present invention provides a centrifugal impeller with a vortex shedding inhibition groove, comprising:

[0034] Roulette 1;

[0035] A plurality of long blades 2 are arranged at the edge of the impeller 1 at equal circumferential intervals; one side of the long blade 2 is a long blade pressure surface 6, and the other side is a long blade suction surface 7; a plurality of long blade pressure surface vortex shedding inhibition grooves 12 are arranged on the long blade pressure surface 6, and a plurality of long blade suction surface vortex shedding inhibition grooves 13 are arranged on the long blade suction surface 7; one end of the long blade 2 close to the center line of the impeller 1 is the long blade leading edge 4, and the other end of the long blade 2 away from the center line of the impeller 1 is the long blade outlet edge 10; the long blade pressure surface vortex shedding inhibition groove 12 and the long blade suction surface vortex shedding inhibition groove 13 are arranged close to the long blade outlet edge 10;

[0036] A plurality of winglets 3 are arranged at the edge of the disk 1 at equal circumferential intervals and are staggered with the plurality of long blades 2; one side of the winglet 3 is a winglet pressure surface 8, and the other side is a winglet suction surface 9, and a plurality of winglet pressure surface vortex shedding suppression grooves 14 are arranged at intervals on the winglet pressure surface 8; the end of the winglet 3 close to the center line of the disk 1 is the winglet leading edge 5, and the other end of the winglet 3 away from the center line of the disk 1 is the winglet outlet edge 11; the winglet pressure surface vortex shedding suppression groove 14 is arranged close to the winglet outlet edge 11.

[0037] The winglets 3 and the long blades 2 are arranged alternately and are provided with vortex shedding suppression grooves. This design can strengthen the mutual interference between the vortex generated by the winglets 3 and the vortex of the long blades 2 themselves, thereby accelerating the energy dissipation at the blade outlet, suppressing the vortex shedding at the suction surface of the centrifugal wind wheel blade outlet, improving the wind wheel outlet flow, and improving the overall performance of the fan.

[0038] Further optimizing the scheme, the length of the vortex shedding suppression groove 12 on the long blade pressure surface near the impeller 1 and the vortex shedding suppression groove 13 on the long blade suction surface is m, and the value range of m is 9mm-12mm;

[0039] The lengths of the plurality of vortex shedding suppression grooves 12 on the pressure surfaces of the long blades and the vortex shedding suppression grooves 13 on the suction surfaces of the long blades along the direction away from the impeller 1 are increased by 0.5 mm in sequence.

[0040] Further optimizing the scheme, the depth of the vortex shedding suppression groove 12 on the long blade pressure surface and the vortex shedding suppression groove 13 on the long blade suction surface is n, and the value of n is 0.1mm-0.5mm;

[0041] The width of the vortex shedding suppression groove 12 on the pressure surface of the long blade and the vortex shedding suppression groove 13 on the suction surface of the long blade is o, and the value of o is 0.1mm-0.4mm.

[0042] Further optimizing the scheme, the distance between the vortex shedding suppression groove 12 on the pressure surface of the long blade and the vortex shedding suppression groove 13 on the suction surface of the long blade and the top of the long blade 2 is p, and the value range of p is 1.5mm-2mm;

[0043] The distance between the vortex shedding suppression groove 12 on the pressure surface of the long blade and the vortex shedding suppression groove 13 on the suction surface of the long blade located at the bottom and the root of the long blade 2 is q, and the value range of q is 2mm-3mm.

[0044] Further optimizing the scheme, the length of the vortex shedding suppression groove 14 on the winglet pressure surface close to the wheel disc 1 is r, and the value of r is 8mm-12mm;

[0045] The lengths of the vortex shedding suppression grooves 14 along the pressure surfaces of the plurality of winglets in a direction away from the wheel disc 1 are increased by 0.2 mm in sequence.

[0046] According to a further optimization scheme, the vortex shedding suppression groove 14 on the pressure surface of the winglet has a depth of s, the value of s is 0.1mm-0.3mm, and a width of t, the value of t is 0.1mm-0.4mm.

[0047] Further optimizing the scheme, the distance between the vortex shedding suppression groove 14 located on the top of the winglet pressure surface and the top of the winglet 3 is u, and the value range of u is 1.5mm-2mm;

[0048] The distance between the vortex shedding suppression groove 14 on the winglet pressure surface at the bottom and the root of the winglet 3 is v, and the value range of v is 2mm-3mm.

[0049] According to the further optimization scheme, the length of the long blade 2 is L1, and the length of the winglet 3 is L2;

[0050] Among them, L1>2L2.

[0051] According to a further optimization scheme, the spacing angle between the winglet 3 and the long blade 2 is α;

[0052] The range of α is 15°-25°.

[0053] According to the further optimization scheme, the diameter of the wheel disc 1 is d1, the diameter of the leading edge 4 of the long blade is d2, and the diameter of the leading edge 5 of the winglet is d3;

[0054] Among them, d1>d3>d2, and d3>1.2d2.

[0055] The materials of the wheel disc 1, the long blade 2, and the winglet 3 are the same, and the material is usually polypropylene, and the processing method is generally 3D printing. The thickness of the wheel disc 1 is B, and the value range of B is 1 / 15mm-1 / 3mm; n is the number of long blades 2 and winglets 3, and the value range of the number n is 5-10; the height of the long blade 2 and the winglet 3 is H, and the range of H is 2mm-3mm; the width of the long blade outlet edge 10 is C, and the range of C is 3mm-4mm; the width of the winglet outlet edge 11 is D, and the range of D is 3mm-5mm;

[0056] The shape of the winglet 3 is modified on the basis of the long blade 2. The airfoil and height are consistent with those of the long blade 2, and the thickness is consistent with the thickness of the front end of the long blade 2.

[0057] The number of the winglets 3 is the same as the number of the long blades 2 .

[0058] The specific implementation cases of the present invention are as follows:

[0059] There are 9 long blades 2 and 9 winglets 3, which are evenly distributed in a clockwise direction. The angle α between the long blades 2 and the winglets 3 is 20°, and the material is polypropylene. The thickness of the wheel disc 1 is 2mm, the diameter is 125mm, the width of the outlet edge 10 of the long blade 2 is 2.24mm, the width of the outlet edge 11 of the winglet is 3.69mm, the blade height is 26mm, the diameter of the leading edge 4 of the long blade is 76mm, the diameter of the leading edge 5 of the winglet is 111mm, the lengths of the vortex shedding suppression groove 12 on the pressure surface of the long blade and the vortex shedding suppression groove 13 on the suction surface are 19.5mm, 20mm, and 20.5mm, the width is 2mm, the depth is 0.2mm, the distance from the top of the blade is 3.1mm, and the distance from the root of the blade is 4.9mm; the lengths of the vortex shedding suppression groove 14 on the pressure surface of the winglet are 18.5mm, 18.7mm, and 18.9mm, the width is 0.5mm, the depth is 0.2mm, the distance from the top of the blade is 3.4mm, and the distance from the root of the blade is 5.3mm. Practice has proved that the use of a centrifugal wind wheel with grooves to suppress vortex shedding can reduce the energy of periodic vortex shedding frequency by about 10% compared with the original solution, increase the total pressure energy by 4%, and improve the wind wheel efficiency by more than 3%.

[0060] The directions or positional relationships indicated by “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0061] The above embodiments are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A centrifugal impeller having a vortex shedding suppression groove, characterized in that: include: Roulette (1); A plurality of long blades (2) are arranged at equal intervals in the circumferential direction at the edge of the wheel disc (1); one side of the long blade (2) is a long blade pressure surface (6) and the other side is a long blade suction surface (7); a plurality of long blade pressure surface vortex shedding suppression grooves (12) are arranged at intervals on the long blade pressure surface (6), and a plurality of long blade suction surface vortex shedding suppression grooves (13) are arranged at intervals on the long blade suction surface (7); one end of the long blade (2) close to the center line of the wheel disc (1) is a long blade leading edge (4), and the other end of the long blade (2) away from the center line of the wheel disc (1) is a long blade outlet edge (10); the long blade pressure surface vortex shedding suppression groove (12) and the long blade suction surface vortex shedding suppression groove (13) are arranged in close proximity to the long blade outlet edge (10); A plurality of winglets (3) are arranged at equal intervals in the circumferential direction at the edge of the wheel disc (1) and are staggered with the plurality of long blades (2); one side of the winglet (3) is a winglet pressure surface (8) and the other side is a winglet suction surface (9); a plurality of winglet pressure surface vortex shedding suppression grooves (14) are arranged at intervals on the winglet pressure surface (8); one end of the winglet (3) close to the center line of the wheel disc (1) is a winglet leading edge (5), and the other end of the winglet (3) away from the center line of the wheel disc (1) is a winglet outlet edge (11); the winglet pressure surface vortex shedding suppression groove (14) is arranged in close proximity to the winglet outlet edge (11); The vortex shedding suppression groove (12) on the pressure surface of the long blade near the wheel disc (1) and the vortex shedding suppression groove (13) on the suction surface of the long blade are m in length, and the value range of m is 9 mm-12 mm; The lengths of the plurality of vortex shedding suppression grooves (12) on the pressure surface of the long blade and the vortex shedding suppression grooves (13) on the suction surface of the long blade increase by 0.5 mm in sequence in a direction away from the impeller (1); The depth of the vortex shedding suppression groove (12) on the pressure surface of the long blade and the vortex shedding suppression groove (13) on the suction surface of the long blade is n, and the value of n is 0.1 mm-0.5 mm; The width of the vortex shedding suppression groove (12) on the long blade pressure surface and the vortex shedding suppression groove (13) on the long blade suction surface is o, and the value of o is 0.1 mm-0.4 mm; The distance between the vortex shedding suppression groove (12) on the pressure surface of the long blade and the vortex shedding suppression groove (13) on the suction surface of the long blade and the top of the long blade (2) is p, and the value range of p is 1.5 mm-2 mm; The distance between the long blade pressure surface vortex shedding suppression groove (12) and the long blade suction surface vortex shedding suppression groove (13) located at the bottom and the root of the long blade (2) is q, and the value range of q is 2mm-3mm.

2. A centrifugal impeller with vortex shedding suppression grooves according to claim 1, characterized in that: The vortex shedding suppression groove (14) on the winglet pressure surface close to the wheel disc (1) has a length r, and the value of r is 8 mm-12 mm; The lengths of the plurality of vortex shedding suppression grooves (14) on the pressure surfaces of the winglets in a direction away from the wheel disc (1) are increased by 0.2 mm in sequence.

3. The centrifugal impeller with vortex shedding suppression groove according to claim 1, characterized in that: The vortex shedding suppression groove (14) on the winglet pressure surface has a depth of s, the value of s is 0.1 mm-0.3 mm, and a width of t, the value of t is 0.1 mm-0.4 mm.

4. The centrifugal impeller with vortex shedding suppression grooves according to claim 1, characterized in that: The distance between the vortex shedding suppression groove (14) on the pressure surface of the winglet located at the top and the top of the winglet (3) is u, and the value range of u is 1.5mm-2mm; the distance between the vortex shedding suppression groove (14) on the pressure surface of the winglet located at the bottom and the root of the winglet (3) is v, and the value range of v is 2mm-3mm.

5. The centrifugal impeller with vortex shedding suppression grooves according to claim 1, characterized in that: The length of the long blade (2) is L1, and the length of the winglet (3) is L2; Among them, L1>2L2.

6. The centrifugal impeller with vortex shedding suppression grooves according to claim 1, characterized in that: The interval angle between the winglet (3) and the long blade (2) is α; The range of α is 15°-25°.

7. The centrifugal impeller with vortex shedding suppression grooves according to claim 1, characterized in that: The diameter of the wheel disc (1) is d1, the diameter of the leading edge of the long blade (4) is d2, and the diameter of the leading edge of the winglet (5) is d3; Among them, d1>d3>d2, and d3>1.2d2.

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