CN201635775U - Reverse vortex generator capable of suppressing airflow leakage of impeller tip - Google Patents
Reverse vortex generator capable of suppressing airflow leakage of impeller tip Download PDFInfo
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- CN201635775U CN201635775U CN2009202352442U CN200920235244U CN201635775U CN 201635775 U CN201635775 U CN 201635775U CN 2009202352442 U CN2009202352442 U CN 2009202352442U CN 200920235244 U CN200920235244 U CN 200920235244U CN 201635775 U CN201635775 U CN 201635775U
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Abstract
The utility model discloses a reverse vortex generator capable of suppressing the airflow leakage of an impeller tip, which is characterized in that a non-refrigerated impeller with the outflow angle of 30-70 degrees comprises a drainage section and an outflow section, wherein the drainage section is positioned at a pressure side, and the outflow section is positioned at an impeller top surface; airflow enters from the pressure side, is ejected to leakage flow at a high speed from the impeller top surface, so rotational flow is formed to suppress the airflow leakage of the impeller tip; the included angle alpha which is formed by the tangential directions of a leakage flow line at a coordinate origin O and the point O of an impeller basin curve is 60-80 degrees; and the non-refrigerated impeller lead jet flow from a cooling gas path to eject towards the leakage flow, so reverse rotational flow is formed to suppress the airflow leakage of the impeller tip. The utility model has the advantages that an air source is not needed to be externally connected, so the connection with complicated pipelines is omitted, the weight of an engine is reduced and the reliability thereof is improved; the generator has simple structure, convenient processing and engineering application; and the generator has wide application scope, is particularly designed for the small impeller surface of micro-engines, breaks through the limit of the traditional leakage flow suppressing method, effectively suppresses the micro-impeller tip leakage, and improves the efficiency of the impeller.
Description
Technical field
The utility model relates to a kind of reverse vortex generator that improves the inhibition blade tip flow leakage of turbine efficient, belong to the turbine technical field.
Background technique
Temperature variation causes changeing the influence of the factors such as free, aerodynamic loading, processing and assembly technology of deformation, the bearing of stator when the deformation that centrifugal force produces during the aeroengine high speed rotating, work, need change the enough tip clearances of reservation between the stator at motor, in order to avoid change the mutual friction of stator phase during proper functioning.The existence of tip clearance has produced the blade tip flow leakage, and leakage flow and impeller passage cross flow interact, and cause leakage loss, impeller acting ability drop, and efficient reduces, and engine performance is worsened.Studies show that: tip clearance is leaked the loss that produces and is accounted for 1/3 of impeller level loss; Turbine blade-tip gap increases by 1%, and efficient reduces by 1.5%, and oil consumption rate raises 3%.For the tiny engine that obtains extensive concern and development in recent years, because dwindling of size, the difficulty of making and assembling enlarges markedly, impeller tip clearance and height ratio of blading even about 10% during real work, than 1～2%, tip clearance is more obvious to the influence of engine performance much larger than the gap of conventional engine.
In order to reduce the adverse effect of tip leakage, modern aeroengine adopts initiatively and passive gap control.ACTIVE CONTROL heats or cools off casing or blade surface by fan or gas compressor air-flow are drawn, thereby makes its expansion or contraction reach the purpose of control gap, but there is the not high problem of thermal inertia and heat exchange efficiency in the method.Passive Control mainly adopts casing and blade tip to handle, and utilizes the castor tooth to obturage, and this method has increased the complexity of structure and the difficulty of processing and assembling.For tiny engine, at small
The ACTIVE CONTROL mechanism or the castor tooth densification device of long-pending surface arrangement complexity are very unrealistic.
Summary of the invention
The utility model proposes a kind of reverse vortex generator that suppresses the blade tip flow leakage, air-flow is penetrated against the leakage flow direction form reverse eddy flow, suppress the blade tip flow leakage, be intended to improve impeller adiabatic efficiency, improve engine performance.
Technical solution of the present utility model: a kind of reverse vortex generator that suppresses the blade tip flow leakage is characterized in that to flow 30 °～70 ° of angles, non-refrigerated impeller comprises the Drainage Section and go out the stream section that the Drainage Section is positioned at pressure side, goes out the stream section and is positioned at the leaf end face; Air-flow is entered by pressure side, from the high fast direction leakage flow of leaf end face, forms eddy flow and suppresses the blade tip flow leakage; In the Ye Ding plane, set up origin O point for leaking the intersection point of streamline and leaf pelvic curvature line, leak streamline the angle α between the tangent direction OX direction that tangent direction OP that O order and leaf pelvic curvature line O are ordered be in 60 spend～80 spend between; The impeller that cooling is arranged from cooling air pass exit flow directive leakage flow, forms reverse eddy flow and suppresses the blade tip flow leakage.
Described non-refrigerated impeller need not external source of the gas, is driving source with pressure side and leaf end face pressure difference, and part air-flow in the impeller passage is driven in the Drainage Section.Therefore do not need external source of the gas, saved complicated external pipeline, reduced the difficulty of in impeller, using.
Described non-refrigerated impeller, the bore dia that becomes a mandarin is greater than or equal to the flow-out hole diameter, the ratio range 1～10 of become a mandarin bore dia and flow-out hole diameter.The aperture that becomes a mandarin greatly makes the vortex generator flow increase, and little flow-out hole directly makes the discharge velocity multiplication, promotes the action effect of vortex generator.
The described impeller that cooling is arranged as the jet main flow, requires the jet hole inlet and the air pressure pressure ratio of outlet enough to form the jet that is not less than leakage flow speed 1/2 with the cooling gas circuit.
Advantage of the present utility model: with the high fast direction leakage flow of air-flow, produce reverse eddy flow, significantly suppressed leakage flow, effect is obvious; Reverse vortex generator need not external source of the gas, has saved the connection of complex pipeline, has alleviated the weight of motor and has improved its reliability; Simple in structure, processing and engineering are used convenient; Applied widely, can be applied in conventional engine and tiny engine field, particularly at tiny engine tiny blades surface, break through the narrow limitation of traditional leakage flow inhibition method, effectively restraining impeller tip leakage improves impeller adiabatic efficiency.
Description of drawings
Accompanying drawing 2 is reverse vortex generator centerline hole place face key plan.
Accompanying drawing 3 is that reverse vortex generator goes out to flow angle figure.
Leaf end face, leaf back pressure-plotting (unit handkerchief) when accompanying drawing 4 is no swirlers.
Accompanying drawing 5 is leaf end face when swirler is arranged, leaf back pressure-plotting (unit handkerchief).
Among the figure 1 is leaf top, the 2nd, reverse vortex device, the 3rd, leakage flow, the 4th, passage main flow, the 5th, end wall, the 6th, leaf basin, the 7th, blade back, the 8th, reverse vortex device.
Embodiment
For the impeller of on-bladed cooling, reverse vortex generator is gone into stream interface and is positioned at pressure side near place, leaf top, goes out stream interface and is positioned at the leaf end face near the pressure side place.Reverse vortex generator key Design feature is as follows:
(1) vortex generator becomes a mandarin and flow-out hole center line place face location parameter α.With reference to Fig. 2, in the Ye Ding plane, set up coordinate, its true origin O point is for leaking the intersection point of streamline and leaf pelvic curvature line, wherein OX represents the tangent direction that leaf pelvic curvature line O is ordered, the exterior normal direction that on behalf of leaf pelvic curvature line O, OY order, the tangent direction that streamline order at O is leaked in OP representative, i.e. the angle that the leakage flow velocity attitude of order at O, α are the leakage streamline between the tangent direction OX direction that the tangent direction OP that O is ordered and leaf pelvic curvature line O are ordered.In order to suppress tip leakage stream to greatest extent, design reverse vortex generator center line place face is perpendicular to the Ye Ding plane, and its place face in the plane projection of leaf top along leaking the tangent direction OP direction that streamline is ordered at O.In different tip clearances with when coming stream mode, the leakage flow direction is also inequality, and numerical experiment shows: leak the angle α of streamline between the tangent direction OX direction that tangent direction OP that O is ordered and leaf pelvic curvature line O are ordered and be between 60 °～80 °.For different situations, choose different angle α, can improve the inhibition effect of reverse vortex device.
(2) vortex generator goes out to flow angle beta.With reference to Fig. 3, OM and ON are respectively vortex generator and become a mandarin and the flow-out hole center line, and β is that vortex generator goes out to flow angle, is defined as out the angle of flow path direction and leaf end face.The angle β that as far as possible reduces flow path direction and leaf end face helps to increase the inhibition effect of vortex generator, but too reduce the angle angle β of flow path direction and leaf end face, the deflection angle that flows in β can make vortex generator during less than 30 ° increases, thereby flow losses increase, flow reduces, influence suppresses effect, and from the result of numerical experiment, the angle β effect between 30 °～70 ° that goes out flow path direction and leaf end face is better.
(3) vortex generator becomes a mandarin and the flow-out hole footpath.With reference to Fig. 3, vortex generator becomes a mandarin and flow-out hole footpath and inconsistent, and the bigger aperture that becomes a mandarin can increase the vortex generator flow, and less flow-out hole footpath can increase the vortex generator discharge velocity, improves the inhibition ability of vortex generator.Be designed into the discharge orifice diameter and be greater than or equal to the flow-out hole diameter, the ratio range 1～10 of become a mandarin bore dia and flow-out hole diameter.
For the impeller that the blade cooling is arranged, as the jet main flow, require the jet hole inlet and the air pressure pressure ratio of outlet enough to form the jet that is not less than leakage flow speed 1/2 with the cooling gas circuit.Suppose tip leakage stream mean velocity V
Let out, cooling blast jet inlet and outlet aperture equate, inlet stagnation pressure P
1 *, outlet static pressure P
2, suppose the air-flow constant entropy then enter the mouth stagnation pressure and the outlet static pressure ratio to satisfy following relation:
Wherein, k is a specific heat coefficient, and R is a gas constant, and T is the cooling blast temperature.
Embodiment:
Miniature turbine plane cascade with the cooling of certain on-bladed is an object, the influence of reverse vortex generator to tip leakage stream and cascade performance of having adopted Fluent software numerical simulation.The high 7.36mm of little blade grid passage, the high 6.69mm of leaf, tip clearance and height ratio of blading 10%, sharf be to chord length 7.44mm, pitch 7.11mm, 44.7 ° at inlet air flow angle, inflow Mach number 0.28.Arranged 23 reverse vortex generators, the swirler aperture 0.2mm that becomes a mandarin altogether at the blade tip place, flow-out hole footpath 0.1mm, vortex generator centerline hole place face location parameter α is 70 °, going out to flow angle β is 35 °.Numerical simulation result shows that when inlet flow rate was identical, reverse vortex generator made the tip clearance leakage flow be reduced to 1.540kg/s from 1.592kg/s, has reduced by 3.3%; Reverse vortex generator make blade blade back surface pressure significantly reduce (Fig. 4, Fig. 5), the circumferential load of blade raises, be elevated to 1.533N from 1.444N, raise 6.2%, the rising of the minimizing of leakage flow and circumferential load can effectively increase the acting ability, improves turbine efficiency.
Claims (3)
1. a reverse vortex generator that suppresses the blade tip flow leakage is characterized in that 30 °～70 ° of stream angles, and non-refrigerated impeller comprises the Drainage Section and go out the stream section that the Drainage Section is positioned at pressure side, goes out the stream section and is positioned at the leaf end face; Eddy flow suppresses the blade tip flow leakage and is entered by the stream pressure face, forms from the high fast direction leakage flow of leaf end face; In the Ye Ding plane, set up origin O point for leaking the intersection point of streamline and leaf pelvic curvature line, leakage streamline angle 60-80 ° between the tangent direction that tangent direction that O is ordered and leaf pelvic curvature line O are ordered; The impeller that cooling is arranged from cooling air pass exit flow directive leakage flow, forms reverse eddy flow and suppresses the blade tip flow leakage.
2. a kind of reverse vortex generator that suppresses the blade tip flow leakage according to claim 1 is characterized in that non-refrigerated impeller, and the bore dia that becomes a mandarin is greater than or equal to the flow-out hole diameter, the ratio range 1～10 of become a mandarin bore dia and flow-out hole diameter.
3. according to the described a kind of reverse vortex generator that suppresses the blade tip flow leakage of claim 1, it is characterized in that the described impeller that cooling is arranged, as the jet main flow, require the jet hole inlet and the air pressure pressure ratio of outlet enough to form the jet that is not less than leakage flow speed 1/2 with the cooling gas circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202352442U CN201635775U (en) | 2009-10-21 | 2009-10-21 | Reverse vortex generator capable of suppressing airflow leakage of impeller tip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202352442U CN201635775U (en) | 2009-10-21 | 2009-10-21 | Reverse vortex generator capable of suppressing airflow leakage of impeller tip |
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| CN201635775U true CN201635775U (en) | 2010-11-17 |
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| CN2009202352442U Expired - Fee Related CN201635775U (en) | 2009-10-21 | 2009-10-21 | Reverse vortex generator capable of suppressing airflow leakage of impeller tip |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103104575A (en) * | 2013-01-21 | 2013-05-15 | 南京航空航天大学 | Electric arc type discharging plasma vortex generator |
| US9850764B2 (en) | 2014-02-28 | 2017-12-26 | Rolls-Royce Plc | Blade tip |
| CN112628192A (en) * | 2021-01-12 | 2021-04-09 | 江苏大学 | Blade structure for inhibiting axial flow pump blade tip leakage vortex |
| CN114483211A (en) * | 2022-03-03 | 2022-05-13 | 南京航空航天大学 | Sealing device for reducing gap leakage |
| CN116717499A (en) * | 2023-06-06 | 2023-09-08 | 江苏大学镇江流体工程装备技术研究院 | Hydrofoil blade top leakage flow vortex eliminating device based on passive jet |
-
2009
- 2009-10-21 CN CN2009202352442U patent/CN201635775U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103104575A (en) * | 2013-01-21 | 2013-05-15 | 南京航空航天大学 | Electric arc type discharging plasma vortex generator |
| US9850764B2 (en) | 2014-02-28 | 2017-12-26 | Rolls-Royce Plc | Blade tip |
| CN112628192A (en) * | 2021-01-12 | 2021-04-09 | 江苏大学 | Blade structure for inhibiting axial flow pump blade tip leakage vortex |
| CN114483211A (en) * | 2022-03-03 | 2022-05-13 | 南京航空航天大学 | Sealing device for reducing gap leakage |
| CN114483211B (en) * | 2022-03-03 | 2022-12-27 | 南京航空航天大学 | Sealing device for reducing gap leakage |
| CN116717499A (en) * | 2023-06-06 | 2023-09-08 | 江苏大学镇江流体工程装备技术研究院 | Hydrofoil blade top leakage flow vortex eliminating device based on passive jet |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101117 Termination date: 20121021 |