CN114109896B - High-performance nonlinear symmetrical bionic centrifugal impeller applied to flow control - Google Patents

High-performance nonlinear symmetrical bionic centrifugal impeller applied to flow control Download PDF

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Publication number
CN114109896B
CN114109896B CN202111422445.5A CN202111422445A CN114109896B CN 114109896 B CN114109896 B CN 114109896B CN 202111422445 A CN202111422445 A CN 202111422445A CN 114109896 B CN114109896 B CN 114109896B
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blade
bionic
performance
flap
gurney flap
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CN114109896A (en
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刘刚
田康琪
王坤
董宝田
乐韵
郑世强
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Beihang University
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Beihang University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F04D29/444—Bladed diffusers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence

Abstract

The invention discloses a high-performance nonlinear symmetric bionic centrifugal impeller applied to flow control, which comprises an impeller main body and a plurality of bionic high-performance blades arranged on a hub of the impeller main body, wherein a bladed diffuser is arranged on the outer side of the impeller main body, volute casings are arranged outside the impeller main body and the bladed diffuser, the bionic high-performance blades are in a gull-wing-like shape, a supporting component is arranged in an inner cavity of each bionic high-performance blade, and the two ends of each bionic high-performance blade are respectively a blade front edge and a blade tail edge; the suction surface is provided with a backflow-inhibiting flap which deflects up and down along the suction surface; the pressure surface is provided with a gurney flap component which comprises a first gurney flap and a second gurney flap. The invention can generate larger driving force and compression capacity to the working medium, simultaneously postpones the separation of boundary layers, improves the flow stability and flow efficiency, and improves the single-stage pressure ratio and stabilizes the working area range on the premise of ensuring the isentropic work.

Description

High-performance nonlinear symmetrical bionic centrifugal impeller applied to flow control
Technical Field
The invention relates to the field of fluid machinery, in particular to a high-performance nonlinear symmetric bionic centrifugal impeller applied to flow control.
Background
The centrifugal impeller is widely applied due to the characteristics of simple manufacturing process, high supercharging ratio, simple structure, small axial size, wide stable working range and the like. When the two-dimensional centrifugal impeller is applied to devices such as an inert gas circulating pump, the internal working medium is required to have stable property, good heat exchange capacity, small flow loss and the like, and is easy to compress and expand. The closed system generally uses helium as a compression working medium, but the helium is difficult to compress, so that an inert mixed working medium is used, the inert mixed working medium enables the flow to be separated more easily, the stable working range of the impeller and the pump device is reduced, and the capacity of the impeller for compressing the working medium is reduced.
At present, the pneumatic efficiency of a centrifugal impeller is generally low, the internal flow of the impeller is extremely easy to be unstable under a high-speed rotating state, the phenomena of flow separation and the like frequently occur, and abnormal working conditions such as surging and the like are easily caused. The excellent pneumatic appearance structure of the centrifugal blade is a precondition and guarantee for improving the gas compression capacity of the device. The flow efficiency and the degree of stability of the gas are important, and the strength and the safety of the impeller structure under high-speed operation need to be checked. The centrifugal impeller is developing towards miniaturization, light weight and high speed, and the problem to be solved in the current stage is that on the basis of ensuring the acting of the impeller, the pneumatic fault is reduced, boundary layer separation is inhibited, the flow efficiency is improved, an effective and stable working range is provided, and finally the pressure ratio of the impeller to compress working media is improved. Meanwhile, the uniform air outlet of the volute is ensured, the eddy phenomenon at the outlet of the centrifugal impeller is reduced, and the efficiency of the fan is seriously influenced. Therefore, the high-performance nonlinear symmetrical bionic centrifugal impeller applied to flow control is provided.
Disclosure of Invention
The present invention aims to provide a high-performance non-linear symmetric bionic centrifugal impeller applied to flow control, and aims to solve or improve at least one of the technical problems.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a high-performance nonlinear symmetric bionic centrifugal impeller applied to flow control, which comprises an impeller main body and a plurality of bionic high-performance blades arranged on a hub of the impeller main body, wherein a blade diffuser is arranged on the outer side of the impeller main body, volutes are arranged outside the impeller main body and the blade diffuser, the bionic high-performance blades are bionic gull wing-shaped blades, the top end surfaces of the bionic high-performance blades are suction surfaces, the bottom end surfaces of the bionic high-performance blades are pressure surfaces, the inner cavities of the bionic high-performance blades are provided with supporting components, the supporting components are used for improving the internal structural strength, and the two ends of the bionic high-performance blades are respectively a blade leading edge and a blade trailing edge; the suction surface is provided with a backflow-inhibiting flap, and the backflow-inhibiting flap deflects up and down along the suction surface; one end, close to the trailing edge of the blade, of the pressure surface is provided with a gurney flap assembly, the gurney flap assembly comprises a first gurney flap and a second gurney flap which are adjacently arranged, and the first gurney flap and the second gurney flap are used for inhibiting boundary layer separation.
Preferably, the bionic high-performance blade comprises a blade shell, the blade shell is of the seagull-imitating wing type, the top end face of the blade shell is the suction surface, the bottom end face of the blade shell is the pressure surface, the inside of the blade shell is hollow, and the inner cavity of the blade shell is provided with the supporting component; the blade front edge and the blade tail edge are respectively arranged at two ends of the blade shell; the return flow suppression flap is disposed on the suction surface of the blade shell and is deflected up and down along the suction surface of the blade shell; the first gurney flap and the second gurney flap are fixedly connected to one end, close to the trailing edge of the blade, of the pressure surface.
Preferably, the first gurney flap is a wave-shaped gurney flap, the second gurney flap is a linear gurney flap, the second gurney flap and the first gurney flap are fixedly connected to the pressure surface, and the second gurney flap is located at one end of the first gurney flap close to the trailing edge of the blade.
Preferably, the backflow-inhibiting flap is arranged at 65% of the chord length of the suction surface from the leading edge of the blade.
Preferably, the supporting component comprises a plurality of supporting beams, each supporting beam comprises a first cross beam fixedly connected to the top of the inner cavity of the blade shell, a second cross beam fixedly connected to the bottom of the inner cavity of the blade shell, and a vertical beam fixedly connected between the first cross beam and the second cross beam.
Preferably, the suction surface is provided with a groove, the groove is positioned at a 65% chord length position along the leading edge of the blade, the backflow-inhibiting flap is positioned in the groove, and one end of the backflow-inhibiting flap is rotatably connected with the suction surface through a rotating shaft.
Preferably, the vaned diffuser is disposed radially outside the vane housing, and the vaned diffuser is configured to increase a diffuser capacity.
Preferably, the vaned diffuser is provided with diffuser blades, the leading edges of the diffuser blades are round heads, and the trailing edges of the diffuser blades are blunt trailing edges.
Preferably, the volute is provided with an air inlet and an air outlet.
Preferably, the volute is circular in cross-section.
The invention discloses the following technical effects:
the backflow-inhibiting flap is arranged on the suction surface and can deflect up and down along the suction surface of the bionic high-performance blade, and when airflow of the suction surface flows through the backflow-inhibiting flap, the backflow-inhibiting flap interferes with the flow field of the backflow area of the suction surface of the bionic high-performance blade, so that the distribution of dynamic stall vortexes on the surface of the bionic high-performance blade is changed, and the dynamic stall characteristic of the bionic high-performance blade can be improved;
the first gurney flap and the second gurney flap are fixedly connected to one end, close to the tail edge of the blade, of the pressure surface, and the application of the first gurney flap and the second gurney flap can enable the impeller to have good adaptability to work of a working medium at different rotating speeds and different flow rates, and basically maintain higher working efficiency;
according to the invention, the backflow inhibiting flap, the first gurney flap and the second gurney flap are arranged, so that the flow separation point of the high-performance nonlinear symmetric bionic centrifugal impeller applied to flow control is delayed under the working condition of high-speed operation, the occurrence of boundary layer separation is delayed, the orderly and concentrated flow of gas is promoted, the uniformity of a flow field in the impeller is improved, the flow stability is improved, and the structural strength is improved; the invention can improve the pressure difference between the suction surface and the pressure surface of the bionic high-performance blade, enhance the working capacity of the high-performance nonlinear symmetrical bionic centrifugal impeller applied to flow control and improve the pressure ratio;
the bionic high-performance blade imitating the seagull is used, the displacement size and the direction of the impeller can be effectively controlled, and the working range is wider;
when the impeller rotates at a high speed, the flow separation degree of the wall surface is reduced, the turbulent dissipation strength of the wall surface of the bionic high-performance blade is weakened, and the compression and work-doing capability of the impeller on gas are improved;
the invention provides a high-performance nonlinear symmetric bionic centrifugal impeller applied to flow control by combining the prior art and starting from practical application, the impeller can generate larger driving force and compression capacity to a working medium, and meanwhile, boundary layer separation is delayed, so that on the premise of ensuring isentropic work, the flow stability and flow efficiency are improved, and the single-stage pressure ratio and the range of a stable working area are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a high performance non-linear symmetric bionic centrifugal impeller applied to flow control according to the present invention;
FIG. 2 is a schematic sectional view of a centrifugal blade according to the present invention;
FIG. 3 is a schematic view of the meridian plane structure of the centrifugal vane of the present invention;
wherein, 1, a volute; 2. an impeller body; 3. a vaned diffuser; 4. an exhaust port; 5. bionic high-performance blades; 6. an air inlet; 7. a blade leading edge; 8. a blade shell; 9. a support beam; 10. a rotating shaft; 11. a suppression flap; 12. a first gurney flap; 13. a second gurney flap; 14. the trailing edge of the blade.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1-3, the invention provides a high-performance nonlinear symmetric bionic centrifugal impeller applied to flow control, which belongs to a two-dimensional centrifugal impeller and comprises an impeller main body 2 and a plurality of bionic high-performance blades 5 arranged on a hub of the impeller main body 2, wherein a bladed diffuser 3 is arranged on the outer side of the impeller main body 2, a volute 1 is arranged outside the impeller main body 2 and the bladed diffuser 3, the bionic high-performance blades 5 are in a seagull-imitating wing shape, the top end surfaces of the bionic high-performance blades 5 are suction surfaces, the bottom end surfaces of the bionic high-performance blades 5 are pressure surfaces, the inner cavity of the bionic high-performance blades 5 is provided with a supporting component, the supporting component is used for improving the internal structural strength, and the two ends of the bionic high-performance blades 5 are respectively a blade front edge 7 and a blade tail edge 14; the suction surface is provided with a backflow restraining flap 11, and the backflow restraining flap 11 deflects up and down along the suction surface; one end of the pressure surface, which is close to the trailing edge 14 of the blade, is provided with a gurney flap assembly, the gurney flap assembly comprises a first gurney flap 12 and a second gurney flap 13 which are adjacently arranged, and the first gurney flap 12 and the second gurney flap 13 are used for inhibiting boundary layer separation;
due to the arrangement, the bionic high-performance blade 5 is of a simulated gull wing type, so that the displacement size and direction of the impeller can be effectively controlled, and the working range is wider; the bionic high-performance blade 5 is hollow, so that the lightweight of the bionic high-performance blade 5 can be realized, and the structural strength of the bionic high-performance blade 5 is improved through the support component;
when the airflow of the suction surface flows through the backflow-inhibiting flap 11, the backflow-inhibiting flap 11 changes the distribution of the dynamic stall vortex on the surface of the bionic high-performance blade 5 by interfering with the flow field of the backflow region of the suction surface of the bionic high-performance blade 5, so that the dynamic stall characteristic of the bionic high-performance blade 5 can be improved;
the first gurney flap 12 and the second gurney flap 13 are arranged near the trailing edge of the blade of the pressure surface, and the first gurney flap 12 and the second gurney flap 13 are applied, so that the impeller has good adaptability to work doing of working media under different rotating speeds and different flow rates, and high working efficiency is basically maintained; according to the invention, the backflow inhibiting flap 11, the first gurney flap 12 and the second gurney flap 13 are arranged, so that the flow separation point of the high-performance nonlinear symmetrical bionic centrifugal impeller applied to flow control is delayed under the working condition of high-speed operation, the occurrence of boundary layer separation is delayed, the orderly and concentrated flow of gas is promoted, the uniformity of the flow field in the impeller is improved, the flow stability is improved, and the structural strength is improved;
the invention can improve the pressure difference between the suction surface and the pressure surface of the bionic high-performance blade 5, enhance the working capacity of the high-performance nonlinear symmetrical bionic centrifugal impeller applied to flow control and improve the pressure ratio;
when the impeller rotates at a high speed, the flow separation degree of the wall surface is reduced, the turbulent dissipation strength of the wall surface of the bionic high-performance blade 5 is weakened, and the compression and work-doing capability of the impeller to gas are improved, when the blade leading edge 7 of the bionic high-performance blade 5 forms a certain included angle with the incoming flow direction, namely under a proper large attack angle, the motion of a backflow flap is inhibited from influencing the distribution of dynamic stall vortexes of the airfoil profile, so that the pitching moment of the airfoil profile is greatly weakened, the average resistance is not increased while the average lift force is improved, the dynamic stall characteristic of the trailing edge 14 part of the blade is improved, and the level of converting kinetic energy into pressure potential energy of the bionic high-performance blade 5 is improved;
the invention provides a high-performance nonlinear symmetric bionic centrifugal impeller applied to flow control by combining the prior art and starting from practical application, the impeller can generate larger driving force and compression capacity to a working medium, and meanwhile, boundary layer separation is delayed, so that on the premise of ensuring isentropic work, the flow stability and flow efficiency are improved, and the single-stage pressure ratio and the range of a stable working area are improved.
According to a further optimized scheme, the bionic high-performance blade 5 comprises a blade shell 8, the blade shell 8 is of a seagull-wing-like shape, the top end face of the blade shell 8 is a suction face, the bottom end face of the blade shell 8 is a pressure face, the interior of the blade shell 8 is hollow, and a supporting component is arranged in an inner cavity of the blade shell 8; the blade front edge 7 and the blade tail edge 14 are respectively arranged at two ends of the blade shell 8; the return flow suppression flap 11 is arranged on the suction surface of the blade shell 8, and the return flow suppression flap 11 deflects up and down along the suction surface of the blade shell 8; the first gurney flap 12 and the second gurney flap 13 are fixedly connected with one end of the pressure surface close to the trailing edge 14 of the blade; so set up, blade shell 8's inside is equipped with a cavity, is equipped with in the cavity the support assembly guarantees blade shell 8's structural strength when can realize the lightweight.
According to the further optimization scheme, the first gurney flap 12 is a wave-shaped gurney flap, the second gurney flap 13 is a linear gurney flap, the second gurney flap 13 and the first gurney flap 12 are fixedly connected on a pressure surface, and the second gurney flap 13 is positioned at one end, close to the trailing edge 14 of the blade, of the first gurney flap 12; a mounting opening is formed in the end part, close to the trailing edge 14 of the blade, of the pressure surface of the blade shell 8, a second gurney flap 13 and a first gurney flap 12 are both fixedly mounted in the mounting opening, the first gurney flap 12 is of a lying S shape, one end of the first gurney flap 12 is in uniform transition with the pressure surface of the blade shell 8, the second gurney flap 13 is fixedly connected to the other end of the first gurney flap 12, the section of the second gurney flap 13 is of an I shape, the second gurney flap 13 is perpendicular to the pressure surface of the blade shell 8, a space is formed between the second gurney flap 13 and the trailing edge 14 of the blade, and the section of the first gurney flap 12 and the section of the second gurney flap 13 after combination is of an S + I shape; by the arrangement of the combination of the S + I-shaped first gurney flap 12 and the second gurney flap 13, the flow separation point of the impeller under the high-speed operation working condition can be delayed, the occurrence of boundary layer separation is delayed, the orderly and concentrated flow of gas is promoted, the uniformity of the flow field in the impeller is improved, the flow stability is improved, and the structural strength is improved.
In a further optimized scheme, the backflow restraining flap 11 is arranged at 65% of the chord length of the suction surface from the leading edge 7 of the blade; with the arrangement, when the airflow of the suction surface flows through the backflow-inhibiting flap 11, the backflow-inhibiting flap 11 interferes with the flow field of the suction surface backflow area of the blade shell 8, so that the distribution of dynamic stall vortexes on the surface of the blade shell 8 is changed, and the dynamic stall characteristic of the bionic high-performance blade 5 can be improved.
Further optimize the scheme, the supporting component includes a plurality of supporting beam 9, supporting beam 9 includes the first crossbeam of rigid coupling at 8 inner chambers of blade shell tops, the rigid coupling is at the second crossbeam of 8 inner chambers of blade shell bottoms, the rigid coupling is at the perpendicular roof beam between first crossbeam and second crossbeam, the one end rigid coupling of perpendicular roof beam is at the tip of first crossbeam, the other end rigid coupling of perpendicular roof beam is at the tip that second crossbeam and first crossbeam are relative, so set up, first crossbeam, erect the roof beam, the supporting beam 9's of formation after the second crossbeam makes up the cross-section be the U type, two adjacent supporting beam 9's U type opening sets up relatively, can be in the light-weighted while of the bionical high performance blade of assurance, effectively promote structural strength.
According to the further optimization scheme, the suction surface is provided with a groove, the groove is located at the 65% chord length position along the leading edge 7 of the blade, the backflow-inhibiting flap 11 is located in the groove, and one end of the backflow-inhibiting flap 11 is rotatably connected with the suction surface through the rotating shaft 10.
In a further optimized scheme, the vane diffuser 3 is arranged on the radial outer side of the vane shell 8, and the vane diffuser 3 is used for increasing the diffusion capacity.
Further optimization scheme is equipped with the diffuser blade on having the blade diffuser 3, and the leading edge of diffuser blade is the button head, and the trailing edge of diffuser blade is blunt trailing edge.
According to a further optimized scheme, an air inlet 6 and an air outlet 4 are formed in the volute 1; with such arrangement, when the impeller of the present invention operates at a high speed, the air flows in from the air inlet 6, respectively flows through the pressure surface and the suction surface of the bionic high performance blade 5, and is discharged from the air outlet 4.
In a further optimized scheme, the cross section of the volute 1 is circular; with the arrangement, the flow loss of the volute 1 with the circular cross section is lower than that of the volute with the rectangular cross section, and the volute 1 gradually converts the kinetic energy of the fluid into pressure potential energy by reducing the speed of the medium and continuously expanding the flow area so as to realize the supercharging effect.
The working principle is as follows:
the invention relates to a high-performance nonlinear symmetrical bionic centrifugal impeller applied to flow control, which belongs to a two-dimensional centrifugal impeller.A gas flow flows in from a gas inlet 6 and respectively flows through a pressure surface and a suction surface of a bionic high-performance blade 5 when the impeller runs at a high speed; when the airflow flowing through the pressure surface of the bionic high-performance blade 5 flows through the first gurney flap 12 and the second gurney flap 13, the separation of boundary layers can be effectively inhibited when the first gurney flap 12 and the second gurney flap 13 are used, so that the impeller has good adaptability to the work doing of a working medium under different rotating speeds and different flow rates, and higher working efficiency is basically maintained; when the airflow flowing through the suction surface flows through the backflow-inhibiting flap 11, the backflow-inhibiting flap 11 changes the distribution of the dynamic stall vortex on the surface of the bionic high-performance blade 5 by interfering with the flow field of the backflow region of the suction surface of the bionic high-performance blade 5, so that the dynamic stall characteristic of the bionic high-performance blade 5 can be improved; by the arrangement of the backflow flap 11, the first gurney flap 12 and the second gurney flap 13, under the working condition of high-speed operation, the flow separation point is delayed, the occurrence of boundary layer separation is delayed, the orderly and concentrated flow of gas is promoted, the uniformity of the flow field in the impeller is improved, the flow stability is improved, and the structural strength is improved; after flowing out from the pressure surface and the suction surface of the bionic high-performance blade 5, the airflow is pressurized along the blade diffuser 3 and then is discharged along the exhaust port 4.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (8)

1. Be applied to flow control's bionical centrifugal impeller of high performance nonlinear symmetry, including impeller main part (2), a plurality of set up in bionical high performance blade (5) on the wheel hub of impeller main part (2), impeller main part (2) outside is equipped with leaf diffuser (3), impeller main part (2) with there is leaf diffuser (3) dustcoat to be equipped with spiral case (1), its characterized in that:
the bionic high-performance blade (5) is in a shape of a bionic gull wing, the top end face of the bionic high-performance blade (5) is a suction surface, the bottom end face of the bionic high-performance blade (5) is a pressure surface, a supporting component is arranged in an inner cavity of the bionic high-performance blade (5) and used for improving the internal structural strength, and the two ends of the bionic high-performance blade (5) are respectively a blade leading edge (7) and a blade trailing edge (14); the suction surface is provided with a backflow inhibiting flap (11), and the backflow inhibiting flap (11) deflects up and down along the suction surface; a gurney flap assembly is arranged at one end, close to the trailing edge (14), of the pressure surface, and comprises a first gurney flap (12) and a second gurney flap (13) which are adjacently arranged, and the first gurney flap (12) and the second gurney flap (13) are used for inhibiting boundary layer separation;
the first gurney flap (12) is a wave-shaped gurney flap, one end of the first gurney flap (12) is in uniform transition with the pressure surface of the bionic high-performance blade (5), the second gurney flap (13) is a linear gurney flap, the second gurney flap (13) is perpendicular to the pressure surface of the bionic high-performance blade (5), the second gurney flap (13) and the first gurney flap (12) are fixedly connected to the pressure surface, and the second gurney flap (13) is located at one end, close to the trailing edge (14) of the blade, of the first gurney flap (12);
the return flow flap (11) is arranged at 65% of the chord length of the suction surface from the blade leading edge (7).
2. The high-performance nonlinear-symmetric bionic centrifugal impeller applied to flow control according to claim 1, characterized in that: the bionic high-performance blade (5) comprises a blade shell (8), the blade shell (8) is of the seagull-wing-like shape, the top end face of the blade shell (8) is the suction surface, the bottom end face of the blade shell (8) is the pressure surface, the inside of the blade shell (8) is hollow, and the supporting component is arranged in the inner cavity of the blade shell (8); the blade front edge (7) and the blade tail edge (14) are respectively arranged at two ends of the blade shell (8); the return flow suppression flap (11) is arranged on the suction surface of the blade shell (8), and the return flow suppression flap (11) deflects up and down along the suction surface of the blade shell (8); the first gurney flap (12) and the second gurney flap (13) are fixedly connected to one end of the pressure surface, which is close to the trailing edge (14) of the blade.
3. The high-performance nonlinear-symmetric bionic centrifugal impeller applied to flow control according to claim 2, characterized in that: the supporting component comprises a plurality of supporting beams (9), the supporting beams (9) comprise a first cross beam and a second cross beam, wherein the first cross beam and the second cross beam are fixedly connected to the top of an inner cavity of the blade shell (8), the second cross beam and the second cross beam are fixedly connected to the bottom of the inner cavity of the blade shell (8), and the first cross beam and the vertical beams are arranged between the second cross beams.
4. The high-performance nonlinear-symmetric bionic centrifugal impeller applied to flow control according to claim 1, characterized in that: the suction surface is provided with a groove, the groove is positioned along 65% of chord length of the leading edge (7) of the blade, the backflow inhibiting flap (11) is positioned in the groove, and one end of the backflow inhibiting flap (11) is rotatably connected with the suction surface through a rotating shaft (10).
5. The high-performance nonlinear-symmetric bionic centrifugal impeller applied to flow control according to claim 2, characterized in that: the vaned diffuser (3) is arranged on the radial outer side of the blade shell (8), and the vaned diffuser (3) is used for increasing the diffusion capacity.
6. The high-performance nonlinear-symmetric bionic centrifugal impeller applied to flow control according to claim 1, characterized in that: be equipped with the diffuser blade on vaned diffuser (3), the leading edge of diffuser blade is the button head, the trailing edge of diffuser blade is blunt trailing edge.
7. The high-performance nonlinear-symmetric bionic centrifugal impeller applied to flow control according to claim 1, characterized in that: an air inlet (6) and an air outlet (4) are formed in the volute (1).
8. The high-performance nonlinear-symmetric bionic centrifugal impeller applied to flow control according to claim 1, characterized in that: the cross section of the volute (1) is circular.
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