CN216618022U - Variable camber guide vane that bionics is adjustable from front to back - Google Patents
Variable camber guide vane that bionics is adjustable from front to back Download PDFInfo
- Publication number
- CN216618022U CN216618022U CN202123027807.9U CN202123027807U CN216618022U CN 216618022 U CN216618022 U CN 216618022U CN 202123027807 U CN202123027807 U CN 202123027807U CN 216618022 U CN216618022 U CN 216618022U
- Authority
- CN
- China
- Prior art keywords
- blade
- ori
- variable camber
- guide vane
- wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model discloses a bionic front-back adjustable variable camber guide vane, which comprises: the tail edge of the front blade is circular, the front edge of the rear blade is circular, the tail edge of the front blade and the front edge of the rear blade are tangent to the intersection point of the mean camber line and the tail edge of the front blade, and the front blade consists of a front blade body, a rear blade body and a central arc lineThe front edge of the front blade is formed by stacking a series of periodically-changed elements, the front edge of the front blade is distributed in a wave-shaped curve, the wave-shaped curve is a sine curve, and the curve equation of the wave-shaped curve is as follows: LEh＝LEori+cos(HbW.times.pi). times.A. The front edge of the front and rear adjustable variable camber guide vane is provided with the knot-shaped bulge with a certain wavelength and amplitude which change according to sine curve, so that the effects of controlling the rear vane airflow separation, reducing the total pressure loss of the variable camber guide vane and widening the available turning angle range are achieved.
Description
Technical Field
The utility model relates to the technical field of aero-engines, in particular to a variable camber guide vane capable of being adjusted front and back in bionics.
Background
In an aircraft engine and a ground gas turbine, in order to ensure that the compressor does not enter a stall state under all working conditions, some adjusting mechanisms are required to ensure that the compressor keeps a larger surge margin, wherein the adjustable guide vane is an important and widely applied adjusting measure. Currently, the actually used adjustable guide vanes are generally divided into two types, wherein one type is integrally adjustable and is mainly used for the front stage of the high-pressure compressor; one is a guide vane which is divided into halves and can be adjusted, namely the guide vane is divided into a front vane and a rear vane, the front vane is fixed, the rear vane is integrally adjustable, and the guide vane is mainly used for an inlet of a low-pressure compressor; in effect, the available turning angle range of the half-divided adjustable variable camber guide vane is larger. With the continuous advancement of aircraft engine technology, and particularly with the introduction of variable cycle engine concepts, higher demands are placed on the available turning angle range and total pressure loss of the variable camber guide vanes. At present, a front-back adjustable variable camber guide vane is also provided, and the front vane and the back vane can rotate around a rotating shaft, so that the available rotating angle range can be further widened.
However, the front and rear adjustable variable camber guide vane also has the problem that along with the increase of the rotation angle of the front vane, the increase of the pneumatic attack angle of the front vane can cause the air flow separation of the suction surface to be intensified, further cause the loss to increase, and limit the working range of the front and rear adjustable variable camber guide vane. Therefore, a new guide vane capable of improving the problem of increasing the aerodynamic attack angle of the front blade to aggravate the airflow separation of the suction surface and increasing the available rotation angle range of the variable camber guide vane is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provides a bionic front-back adjustable variable camber guide vane, wherein the front edge of the front-back adjustable variable camber guide vane is provided with a knot-shaped bulge with a certain wavelength and amplitude which change according to sinusoidal curve, so that the effects of controlling the separation of the rear-vane airflow, reducing the total pressure loss of the variable camber guide vane and widening the available turning angle range are achieved.
In order to realize the purpose, the utility model adopts the technical scheme that: the utility model provides an adjustable variable camber stator around bionics which characterized in that includes: the front blade and the rear blade, the trailing edge of front blade is circular, the leading edge leaf of rear blade is circular, the trailing edge of front blade and the leading edge of rear blade are tangent in the intersection point department of mean camber line and front blade trailing edge, the front blade is formed by a series of front blade leading edge along the primitive stack that becomes periodic variation, the leading edge of front blade becomes wavy curvilinear distribution, wavy curve is sinusoidal curve and wavy curve's curvilinear equation is:
LEh＝LEori+cos(Hb/W×π)×A
wherein HbRadial distance of current element from hub, LEhFor the current primitive leading edge point axial position, LEoriThe axial position of the front edge point of the prototype element is shown, W is the wavelength of the wave-shaped curve, and A is the amplitude of the wave-shaped curve.
The variable camber guide vane with the adjustable front and back bionics function is characterized in that the value range of the amplitude A of the wave-shaped curve is 0.5% Cori≤A≤5％CoriIn which C isoriIs the chord length of the prototype variable camber vane.
The variable camber guide vane with the adjustable front and back bionics function is characterized in that the value range of the wavelength W of the wave-shaped curve is 5% Cori≤W≤25％CoriIn which C isoriChord length of variable camber guide vane for prototype。
The bionic front-rear adjustable variable camber guide vane is characterized in that the axial position of the center of the front edge of the rear vane is unchanged, and the connecting line of the centers of the front edges of the rear vanes of all elements is perpendicular to the plane of any element.
The variable camber guide vane with the adjustable front and back of the bionic body is characterized in that the stacking is radial stacking, and the stacking axis is a connecting line of the centers of the front edges of the rear vanes.
Compared with the prior art, the utility model combines the local modification technology of the blade according to the characteristics of the nodical bulges at the front edges of the squat fin limbs and the long-eared owl wings, and applies the sine curve type nodular bulges with certain wavelength and wave amplitude to the front edges of the front and back adjustable variable camber guide blades, thereby achieving the effects of controlling the separation of the airflow of the rear blades, reducing the total pressure loss of the variable camber guide blades and widening the range of the available turning angles.
The following provides a more detailed description of the present invention with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic perspective view of a variable camber guide vane with adjustable front and rear bionics according to the present invention.
Fig. 2 is a schematic perspective view of a prototype blade.
FIG. 3 is a side view of a biomimetic front and back adjustable variable camber guide vane of the present invention.
FIG. 4 is a top view of a variable camber guide vane that is adjustable before and after bionics in accordance with the present invention.
FIG. 5 is a schematic view of the rotation of a variable camber guide vane of the present invention with adjustable front and rear bionics.
FIG. 6 is a prototype blade cross-section Mach number cloud.
FIG. 7 is a Mach number cloud plot of the cross section of a bionic blade according to the utility model.
Description of reference numerals:
10-anterior lobe; 20 — posterior lobe.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the utility model.
The method for controlling the flow separation mainly comprises active control and passive control, wherein the passive control mainly solves the problem that the increase of the pneumatic attack angle of the front blade can cause the air flow separation of the suction surface to be intensified along with the increase of the rotation angle of the front blade through local modification of the blade, and further achieves the effect of improving the available rotation angle range of the variable camber guide blade. Compared with an active control technology, the passive control technology has the advantages of simple structure and easiness in implementation.
Bionic engineering is to help human beings to solve a plurality of problems in the prior art by researching tissue organs of organisms in the nature, zoologists carefully research the whales in the sea and the long-eared owls, the fin limbs of the whales and the wing leading edges of the long-eared owls are both in a concave-convex shape, and the concave-convex structure can effectively reduce and improve the resistance of the whales and the long-eared owls in the movement process and improve the maneuvering performance of the whales and the long-eared owls.
As shown in fig. 1 to 5, the present invention discloses a bionic front-rear adjustable variable camber guide vane, which comprises: the front blade 10 and the rear blade 20, the front blade 10 and the rear blade 20 both being rotatable around a rotating shaft, the trailing edge of the front blade 10 being circular, the leading edge of the rear blade 20 being circular, the trailing edge of the front blade 10 and the leading edge of the rear blade 20 being tangent to the intersection point of the mean camber line and the trailing edge of the front blade, the front blade 10 being formed by stacking a series of front blade leading edge edges along periodically changing primitives, the leading edge of the front blade 10 being distributed in a wave-shaped curve, the wave-shaped curve being a sine curve, and the curve equation of the wave-shaped curve being:
LEh＝LEori+cos(Hb/W×π)×A
wherein HbRadial distance of current element from hub, LEhFor the current primitive leading edge point axial position, LEoriThe axial position of the front edge point of the prototype element is shown, W is the wavelength of the wave-shaped curve, and A is the amplitude of the wave-shaped curve.
According to the characteristics of the nodical bulges on the fin limbs of the whale head and the front edges of the long-eared owl wings, the bionic front-back adjustable variable camber guide vane in the embodiment is combined with a local blade modification technology, and the front edge of the front-back adjustable camber guide vane is provided with the sine curve type knotted bulges with certain wavelength and wave amplitude, so that the effects of controlling rear-leaf airflow separation, reducing total pressure loss of the variable camber guide vane and widening the available turning angle range are achieved.
In this embodiment, the amplitude a of the wave-shaped curve has a value range of 0.5% Cori≤A≤5％CoriIn which C isoriIs the chord length of the prototype variable camber vane.
The value range of the wavelength W of the wave-shaped curve is 5% Cori≤W≤25％CoriIn which C isoriIs the chord length of the prototype variable camber vane.
The axial position of the center of the front edge of the rear blade 20 is unchanged, and the connecting line of the centers of the front edges of the rear blades of all the elements is vertical to the plane of any element.
The stacking is radial stacking, and the stacking axis is a connecting line of the centers of the front edges of the rear blades.
The variable camber guide vane with adjustable bionics front and back in the implementation is obtained by the following method, and specifically comprises the following steps:
firstly, carrying out parametric modeling on a prototype primitive of the variable camber guide vane, wherein the specific method is modeling by adopting a mean camber line plus thickness distribution rule, and the key points are to determine the front vane profile, the position of a rotating shaft, namely the center of a circle of a front edge of a rear vane and the position of a front edge of the prototype primitive;
step two, determining the amplitude A, the wavelength W and the blade height H of the front edge wave-shaped curve, and the number Num of elements required by three-dimensional modeling, and determining the radial distance H of each element according to the hubb；
Step three, modeling the elements determined in the step two one by one, wherein the axial position of the front edge point of the front blade is according to a curve equation of a wave-shaped curve: LEh＝LEori+cos(HbThe value is determined at/Wxπ). times.A.
And step four, sequentially stacking the elements designed in the step three to obtain the front-leaf profile, wherein the stacking axis is a connecting line of the centers of the front edges of the rear leaves.
In the embodiment, the design parameters of the front and rear adjustable variable camber guide vane part are that the vane bend angle is-6.53 degrees, the chord length is 146.1mm, the relative position of the slot is 0.41, the maximum relative thickness of the vane is 0.06, and the front vane and the rear vane can rotate around the rotating shaft.
As shown in fig. 4, parametric modeling was performed on prototype front and rear adjustable variable camber vanes: the blade profiles with different blade height sections adopt a shaping mode of camber line plus thickness distribution. The rotation axis is a connection line of the centers of the front edges of the rear leaves of different elements, the coordinates of the centers of the circles are calculated, and the front leaves and the rear leaves can rotate around the rotation axis, as shown in fig. 4. The slotting position is located at the position of 0.41 in the chord direction relative position, the chord length of the blade is 146.1mm, and the blade height is 40 mm.
As shown in fig. 3 and 4, the front and rear adjustable variable camber guide vane full-blade height front edge of the prototype is locally modified, so that the front edge part forms a sine curve wave curve with periodic variation, wherein: the amplitude A of the wave curve is the chord length Cori1%, i.e. 1.461mm, the wavelength W is set to 8mm, occupying about the chord length Cori5.48% of the total weight.
The element blade is radially selected from 91 non-thickness blade elements, the radial spacing of each element is equal, and the radial height of each element is determined by the following formula, wherein the radial spacing is marked as b1 and b2 … … b91 from root to tip:
Hb,i40/90 (i-1) units of mm, the leading point of each primitive can be determined by:
LEh＝LEori+cos(Hb/W×π)×A
wherein HbRadial distance of current element from hub, LEhFor the current primitive leading edge point axial position, LEoriThe axial position of the front edge point of the prototype element is shown, W is the wavelength of the wave-shaped curve, and A is the amplitude of the wave-shaped curve. In the blade profile, the axial distance between the crest element and the trough element is the amplitude of the wave curve, and the distance between two crest (trough) elements is the wavelength of the wave curve. The primitive located in the middle of two peak (valley) primitives is the prototype primitive.
After the position of the front edge of each element is determined, the elements are sequentially generated by adopting a mean camber line thickness distribution method, and stacking is carried out according to the radial stacking mode of the circle center of the front edge of the rear blade.
The variable camber guide vane with adjustable front and back is obtained according to the above method, and the front and back rotating shafts can rotate around the rotating shaft, as shown in fig. 5.
Aiming at the working conditions of a front blade corner of 10 degrees and a rear blade corner of 35 degrees, the conditions of 0.30, 0.35 and 0.40 of incoming flow Mach numbers are inspected by using commercial software CFX, compared with a prototype front-rear adjustable variable camber guide blade, the separation area of a rear blade suction surface is obviously reduced (considering that a gap is relatively small, a front blade tail edge and a rear blade front edge are tangent and a seam channel is ignored in simulation calculation), the incoming flow Mach number of 0.35 is shown in figures 6 and 7, and a comparison graph of a prototype high-section Mach number cloud picture of the prototype and a 0.8 blade high-section Mach number cloud picture of a modified blade is shown in the following table when the front blade corner of 10 degrees and the rear blade corner of 35 degrees, so that the total pressure loss of the modified blade is obviously reduced, and the turning angle of the air flow is basically kept unchanged. The available corner range can be effectively widened.
Comparison table for numerical simulation results
The above description is only a preferred embodiment of the utility model, and is not intended to limit the utility model, and any simple modification, change and equivalent structure change made to the above embodiments according to the technical substance of the utility model all still belong to the protection scope of the technical solution of the utility model.
Claims (5)
1. The utility model provides an adjustable variable camber stator around bionics which characterized in that includes: front leaf (10) and rear leaf (20), the trailing edge of front leaf (10) is circular, the leading edge leaf of rear leaf (20) is circular, the trailing edge of front leaf (10) is tangent in the intersection point of mean camber line and front leaf trailing edge with the leading edge of rear leaf (20), front leaf (10) is piled up along the primitive that becomes periodic variation by a series of front leaf leading edges, the leading edge of front leaf (10) becomes wave type curve distribution, wave type curve is the sinusoidal curve and the curvilinear equation of wave type curve is:
LEh＝LEori+cos(Hb/W×π)×A
wherein HbRadial distance of current element from hub, LEhFor the axial position of the leading edge point of the current element, LEoriThe axial position of the front edge point of the prototype element is shown, W is the wavelength of the wave-shaped curve, and A is the amplitude of the wave-shaped curve.
2. A biomimetic front and back adjustable variable camber guide vane according to claim 1, wherein the amplitude a of the wave-shaped curve has a value range of 0.5% Cori≤A≤5％CoriIn which C isoriIs the chord length of the prototype variable camber vane.
3. A biomimetic front-rear adjustable variable camber guide vane according to claim 1, wherein a range of a wavelength W of the wave-shaped curve is 5% Cori≤W≤25％CoriIn which C isoriIs the chord length of the prototype variable camber vane.
4. A biomimetic front and rear adjustable variable camber guide vane according to claim 1, characterized in that the axial position of the center of the leading edge of the trailing blade (20) is constant, and the line of the centers of the leading edges of the trailing blades of each element is perpendicular to the plane of any element.
5. The bionic front-rear adjustable variable camber guide vane according to claim 1, wherein the stacking is radial stacking, and the stacking axis is a connecting line of the centers of the front edges of the rear vanes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123027807.9U CN216618022U (en) | 2021-12-06 | 2021-12-06 | Variable camber guide vane that bionics is adjustable from front to back |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123027807.9U CN216618022U (en) | 2021-12-06 | 2021-12-06 | Variable camber guide vane that bionics is adjustable from front to back |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216618022U true CN216618022U (en) | 2022-05-27 |
Family
ID=81700670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123027807.9U Active CN216618022U (en) | 2021-12-06 | 2021-12-06 | Variable camber guide vane that bionics is adjustable from front to back |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216618022U (en) |
-
2021
- 2021-12-06 CN CN202123027807.9U patent/CN216618022U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11273892B2 (en) | Propeller | |
| CN106351878B (en) | A kind of axis stream skewed blade | |
| RU2742113C2 (en) | Blade screw | |
| CN108386383A (en) | A kind of intersection bionic blade and preparation method thereof of combination Scad section's fish bodies and pinion | |
| CN104564804B (en) | Wind wheel blade, cross-flow wind wheel and design method of wind wheel blade | |
| CN111120401A (en) | Multi-wing centrifugal ventilator blade design method based on NACA wing profile | |
| CN112576546B (en) | Optimization method of non-uniform-thickness airfoil axial flow blade | |
| CN113553671A (en) | Bionic anti-cavitation axial flow impeller design method | |
| CN114444196A (en) | Design method and device for self-adaptive gap adjustment variable-camber guide vane | |
| CN216618022U (en) | Variable camber guide vane that bionics is adjustable from front to back | |
| CN113153812B (en) | C-type starting forward-bent multi-wing centrifugal fan impeller and preparation method thereof | |
| CN114321018A (en) | Bionic front-rear adjustable variable camber guide vane and design method thereof | |
| CN115596707B (en) | Axial-flow impeller with vortex generator | |
| CN214741820U (en) | Bionic combined structure applied to impeller flow control | |
| CN216406913U (en) | Axial flow turbine and turbine blade | |
| CN103168172A (en) | Wind turbine blade, wind power generating device comprising same, and wind turbine blade design method | |
| CN105298912A (en) | Bump front edge inlet guider blade | |
| CN111255742B (en) | Trans/supersonic compressor rotor blade with shock wave control bulge | |
| CN114139306A (en) | Bionic elliptical wave front edge blade and design method | |
| JP6709741B2 (en) | Rotor | |
| CN111622808A (en) | Bionic blade based on existing steam turbine blade profile transformation and design method | |
| CN106014853B (en) | A kind of thick family of aerofoil sections of large scale wind power machine blade | |
| CN116579088A (en) | Bezier curve-based compressor stator blade bionic leading edge design method | |
| CN115263807B (en) | Coupling bionic air conditioner axial flow fan blade structure | |
| CN217682348U (en) | Axial flow fan blade and axial flow fan |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |