阅读说明：本技术 一种大前进比旋翼桨叶反流失速主动控制后缘小翼装置 (Active control trailing edge winglet device for backflow stall of rotor blade with large advancing ratio ) 是由 姜裕标 李国强 杨永东 车兵辉 覃晨 于 2021-10-11 设计创作，主要内容包括：本发明公开一种大前进比旋翼桨叶反流失速主动控制后缘小翼装置,包括主旋翼和在主旋翼后缘设置的反弧小翼,主旋翼内部设置有传动装置,传动装置用于带动反弧小翼做正弦振荡运动；传动装置包括电机、偏心轮、往复滑块和传动齿轮组,电机带动偏心轮旋转,进而带动往复滑块做直线往复运动,往复滑块远离偏心轮的一端设置有齿条,齿条与传动齿轮组啮合,反弧小翼内设置有与传动齿轮组啮合的小翼齿轮,齿条带动传动齿轮组旋转,进而带动小翼齿轮旋转。反弧小翼在主旋翼后缘做正弦振荡运动,通过曲面变形反折后缘,使得翼型后缘能够更紧密地对准迎面而来的气流,从而大大缓解反流气动问题,进而控制反流失速。(The invention discloses a large-advancing-ratio rotor blade reverse-flow stall active control trailing edge winglet device which comprises a main rotor and a reverse arc winglet arranged at the trailing edge of the main rotor, wherein a transmission device is arranged in the main rotor and is used for driving the reverse arc winglet to do sinusoidal oscillation motion; the transmission device comprises a motor, an eccentric wheel, a reciprocating slide block and a transmission gear set, the motor drives the eccentric wheel to rotate and further drives the reciprocating slide block to do linear reciprocating motion, a rack is arranged at one end, away from the eccentric wheel, of the reciprocating slide block, the rack is meshed with the transmission gear set, a winglet gear meshed with the transmission gear set is arranged in the reverse arc winglet, and the rack drives the transmission gear set to rotate and further drives the winglet gear to rotate. The reverse-arc winglet does sinusoidal oscillation motion at the rear edge of the main rotor wing, and the rear edge is deformed and reversely folded through the curved surface, so that the rear edge of the wing profile can be more closely aligned to the oncoming airflow, the problem of reverse flow aerodynamics is greatly relieved, and the reverse flow stall is controlled.)

1. The active control trailing edge winglet device for the reverse stall of the rotor blade with the large advancing ratio is characterized by comprising a main rotor and a reverse arc winglet arranged at the trailing edge of the main rotor, wherein a transmission device is arranged in the main rotor and is used for driving the reverse arc winglet to do sinusoidal oscillation movement; the transmission device comprises a motor, an eccentric wheel, a reciprocating slide block and a transmission gear set, the motor drives the eccentric wheel to rotate and further drive the reciprocating slide block to do linear reciprocating motion, a rack is arranged at one end, far away from the eccentric wheel, of the reciprocating slide block, the rack is meshed with the transmission gear set, a winglet gear meshed with the transmission gear set is arranged in the reverse arc winglet, and the rack drives the transmission gear set to rotate and further drives the winglet gear to rotate.

2. The active control trailing edge winglet device for the stall reversal of rotor blades with a large advancing ratio according to claim 1, wherein the transmission device is arranged inside a main rotor, the main rotor comprises a first end portion and a clamping portion, the first end portion and the clamping portion are detachably connected, a reciprocating slide rail for moving the reciprocating slide block is arranged on one side, close to the first end portion, of the clamping portion, and an accommodating cavity is arranged on one side, close to the clamping portion, of the first end portion and is used for accommodating the transmission device.

3. The apparatus of claim 2, wherein a second end portion is provided on a side of the clip portion remote from the first end portion, the second end portion, the first end portion and the clip portion being removably connected.

4. The apparatus of claim 3, wherein the clip portion comprises a plurality of first holes, the first end portion comprises a plurality of second holes corresponding to the first holes, the second end portion comprises a plurality of third holes corresponding to the first holes, and the first, second, and third holes are adapted to receive bolts and/or bolts to secure the first end portion, the clip portion, and the second end portion together.

5. The apparatus of claim 1, wherein the eccentric comprises an eccentric pin and a flange, wherein a rotation hole is formed in the flange at a center position for connecting to an output shaft of a motor, a plurality of positioning holes for inserting the eccentric pin are formed in the flange around the rotation hole, the eccentric pin is clamped on the reciprocating slider, and the plurality of positioning holes are spaced at different radial distances from the center of the flange to obtain different oscillation amplitudes of the anti-bow winglet.

6. The active control trailing edge winglet device for the regurgitant stall of a rotor blade with a large advancing ratio according to claim 5, wherein one end of the reciprocating slide block connected with the eccentric pin is provided with a clamping part, the clamping part is provided with a transverse groove, and the width of the transverse groove is larger than the diameter of the eccentric pin so as to accommodate the eccentric pin to slide in the groove and drive the clamping part to reciprocate.

7. The active control large lead ratio rotor blade stall-reversing trailing edge winglet device according to claim 1, wherein the drive gear set comprises a dual gear and an intermediate gear, the dual gear comprising first and second gear portions rotating coaxially, the first gear portion being in engagement with the rack, the second gear portion being in engagement with the intermediate gear, and the intermediate gear being in engagement with the winglet gear.

8. An actively controlled trailing edge winglet assembly according to claim 1, wherein the reverse arc winglet tapers in thickness in a direction away from the main rotor, wherein a convex arc portion is provided at an end of the reverse arc winglet proximal to the main rotor, and wherein a concave arc portion is provided at an end of the main rotor proximal to the reverse arc winglet that mates with the convex arc portion.

9. The high forward ratio rotor blade stall reversed active control trailing edge winglet device according to claim 8, wherein the winglet gear rotates coaxially with the convex arc.

10. An actively controlled trailing edge winglet device according to claim 1, wherein the angle of oscillation of the anti-bow winglet is sinusoidal with respect to time.

Technical Field

The invention relates to the field of helicopter rotors, in particular to a large advancing ratio rotor blade reverse stall active control trailing edge winglet device.

Background

When the helicopter flies forward at a certain forward ratio mu, the forward blade area and the backward blade area of the rotor are asymmetrical relative to the air flow speed due to the superposition effect of the incoming flow. In the backward blade area, the relative radius R is smaller than mu R | sin ψ | for a section of blade, the phenomenon that relative airflow blows from the trailing edge to the leading edge occurs, and the area where the phenomenon exists is called a 'reverse flow area'; the aerodynamic efficiency of the blade in the counter-flow area is low, the blade has a serious flow separation phenomenon, stall is easy to occur, and the attack angle, the lift force, the resistance and the pitching moment characteristics of each section of the blade are obviously different from those outside the counter-flow area.

Coaxial rigid rotors are key components of rotor systems, and their performance directly affects the flight performance of high-speed helicopters. The performance of the wing profile, which is the basic component of a coaxial rigid rotor, significantly affects the aerodynamic properties of the coaxial rigid rotor. Take an example of a western costas corporation coaxial rigid rotorcraft XH-59A: XH-59A suffers severe type drag losses at the trailing edge of its rotor at high speeds. This is because at high speeds, the trailing blade has up to 85% of the reverse flow area and the blade root is more in deep reverse flow. Such airflow is prone to separation, resulting in a sharp increase in the drag of the trailing blades and a substantial reduction in cruise efficiency. The wing profile is not specially designed for the flow characteristics of a rotor reverse flow area, and cannot meet the requirements of a high-speed helicopter; accordingly, there is a need for an actively controlled trailing edge winglet device that can control reverse stall, and that is suitable for high-speed helicopters where high forward ratio rotor blade reverse stall is required.

Disclosure of Invention

The invention aims to provide a large advancing ratio rotor blade reverse flow stall active control trailing edge winglet device.

In order to realize the purpose, the following technical scheme is adopted:

the active control trailing edge winglet device comprises a main rotor and a reverse arc winglet arranged at the trailing edge of the main rotor, wherein a transmission device is arranged in the main rotor and is used for driving the reverse arc winglet to do sinusoidal oscillation motion; the transmission device comprises a motor, an eccentric wheel, a reciprocating slide block and a transmission gear set, the motor drives the eccentric wheel to rotate and further drive the reciprocating slide block to do linear reciprocating motion, a rack is arranged at one end, far away from the eccentric wheel, of the reciprocating slide block, the rack is meshed with the transmission gear set, a winglet gear meshed with the transmission gear set is arranged in the reverse arc winglet, and the rack drives the transmission gear set to rotate and further drives the winglet gear to rotate. The reverse-arc winglet does sinusoidal oscillation motion at the rear edge of the main rotor wing, and the rear edge is deformed and reversely folded through the curved surface, so that the rear edge of the wing profile can be more closely aligned to the oncoming airflow, the problem of reverse flow aerodynamics is greatly relieved, and the reverse flow stall is controlled.

Preferably, transmission sets up inside main rotor, main rotor is including dismantling first end and the joint portion of connection, joint portion is close to one side of first end is provided with the confession reciprocating slide rail of reciprocating slide motion, first end is close to one side of joint portion is provided with the holding chamber, the holding chamber is used for the holding transmission can carry out hidden installation to transmission. Preferably, one side that joint portion kept away from first end is provided with the second end, first end and joint portion are for dismantling the connection.

Preferably, the clamping portion is provided with a plurality of first fixing holes, the first end portion is provided with a plurality of second fixing holes corresponding to the first fixing holes, the second end portion is provided with a plurality of third fixing holes corresponding to the first fixing holes, and the first fixing holes, the second fixing holes and the third fixing holes are used for penetrating bolts and/or bolts so as to fix the first end portion, the clamping portion and the second end portion into a whole.

Preferably, the eccentric wheel comprises an eccentric pin and a flange plate, a rotating hole used for being connected with an output shaft of the motor is formed in the center of the flange plate, a plurality of positioning holes used for being connected with the eccentric pin in an inserting mode are formed in the flange plate in a surrounding mode, the eccentric pin is connected to the reciprocating sliding block in a clamping mode, the eccentric pin is the same in size, and the radial distances between the positioning holes and the center of the flange plate are different so that different oscillation amplitudes of the reverse arc winglet can be obtained.

Preferably, the reciprocating slide block is connected one end of the eccentric pin is provided with a clamping part, a transverse groove is arranged on the clamping part, the width of the transverse groove is slightly larger than the diameter of the eccentric pin so as to accommodate the eccentric pin to slide in the groove and drive the clamping part to reciprocate.

Preferably, the transmission gear set comprises a duplicate gear and an intermediate gear, the duplicate gear comprises a first gear part and a second gear part which rotate coaxially, the first gear part is meshed with the rack, the second gear part is meshed with the intermediate gear, and the intermediate gear is meshed with the winglet gear. The eccentric pin arranged on the flange plate on the motor shaft is used as a cam, the cam is inserted into the transverse groove on the reciprocating slide block, the motor drives the flange plate to rotate, so that a rack motion reciprocating according to a sine relation can be generated (positioning holes with different eccentricities on the flange plate correspond to different angle ranges, the eccentric pin is detached and inserted into different positioning holes before the angle state is changed every time), the reciprocating motion of the rack drives the transmission gear set, and then the rack is transmitted to the winglet gear, so that the inverse arc winglet can be driven to do sine oscillation swing. The rack and pinion and the gear set have fidelity characteristic and motion continuity, and can drive the reverse-arc winglet to generate accurate and stable sinusoidal oscillation motion.

Preferably, the thickness of the reverse-arc winglet gradually decreases from the front edge of the wing profile to the rear edge, a convex arc part is arranged at one end, close to the front edge of the wing profile, of the reverse-arc winglet, and a concave arc part matched with the convex arc part is arranged at one end, close to the reverse-arc winglet, of the main rotor.

Preferably, the winglet gear rotates coaxially with the convex arc.

Preferably, the oscillation angle of the anti-arc winglet satisfies a sine function relation with time.

Preferably, the clamping portion is arranged at the root of the main rotor (the device is arranged at the root of the blade to control the stall of the blade root reverse flow area), and the thickness of the clamping portion is larger than that of the first end portion and the second end portion.

Due to the adoption of the technical scheme, the invention has the beneficial effects that: the invention discloses a backward flow stall active control trailing edge winglet device for a rotor blade with a large advancing ratio, which comprises a main rotor and a backward arc winglet arranged at the trailing edge of the main rotor, wherein a transmission device is arranged in the main rotor and is used for driving the backward arc winglet to do sinusoidal oscillation motion; the transmission device comprises a motor, an eccentric wheel, a reciprocating slide block and a transmission gear set, the motor drives the eccentric wheel to rotate so as to drive the reciprocating slide block to do linear reciprocating motion, a rack is arranged at one end, away from the eccentric wheel, of the reciprocating slide block, the rack is meshed with the transmission gear set, a winglet gear meshed with the transmission gear set is arranged in the reverse arc winglet, and the rack drives the transmission gear set to rotate so as to drive the winglet gear to deflect. The reverse-arc winglet does sinusoidal oscillation motion at the rear edge of the main rotor wing, and the rear edge is deformed and reversely folded through the curved surface, so that the rear edge of the wing profile can be more closely aligned to the oncoming airflow, the problem of reverse flow aerodynamics is greatly relieved, and the reverse flow stall is controlled.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic illustration of an explosive structure according to the present invention;

FIG. 2 is a schematic view of a first end of the present invention;

FIG. 3 is a structural schematic view of a clamping portion and a reverse-arc winglet of the invention;

fig. 4 is an enlarged view of the structure of fig. 3 according to the present invention.

Description of specific element symbols: 1. a first end portion; 2. a second end portion; 3. a clamping part; 4. a transmission device; 5. a reverse-arc winglet; 11. an accommodating cavity; 41. a motor; 42. a flange plate; 43. a reciprocating slide rail; 44. a reciprocating slide block; 45. a duplicate gear; 46. an intermediate gear; 47. a winglet gear.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention.

Two difficulties exist in the prior art, one is that the reciprocating transformation of the amplitude and the angular velocity meets the change relation of a sine function curve with time; the other is to arrange mechanisms and power in a limited space; the change mode of the oscillation attack angle determines that the mechanism cannot adopt a crank arm rocker, a crank arm sliding block and other conventional reciprocating mechanisms because the phenomenon of sudden return of the incoming stroke and the return stroke exists, so that the incoming stroke and the return stroke cannot meet the requirement of sinusoidal oscillation of the deflection winglet; the available space for mechanism installation is insufficient and the diameter of the servo motor 41 is large. The present application overcomes the above difficulties, and is explained below by way of examples.

Example 1: referring to fig. 1 to 4, the active trailing edge winglet control device for the reverse stall of the rotor blade with a large advancing ratio of the present embodiment includes a main rotor, a reverse arc winglet 5 disposed at the trailing edge of the main rotor, and a transmission device 4 disposed inside the main rotor, wherein the transmission device 4 is used for driving the reverse arc winglet 5 to make a sinusoidal oscillation motion; the main rotor wing comprises a motor 41, an eccentric wheel, a reciprocating slide block 44 and a transmission gear set, the motor 41 drives the eccentric wheel to rotate so as to drive the reciprocating slide block 44 to do linear reciprocating motion, a rack is arranged at one end, away from the eccentric wheel, of the reciprocating slide block 44, the rack is meshed with the transmission gear set, a winglet gear 47 meshed with the transmission gear set is arranged in the reverse arc winglet 5, and the rack drives the transmission gear set to rotate so as to drive the winglet gear 47 to rotate. The reverse-arc winglet 5 makes sinusoidal oscillation motion at the rear edge of the main rotor wing, and the rear edge is reversely bent through the deformation of the curved surface, so that the rear edge of the wing profile can be more closely aligned to the oncoming airflow, the problem of reverse flow aerodynamics is greatly relieved, and the reverse flow stall is controlled.

Example 2: the transmission 4 of this embodiment sets up inside main rotor, and main rotor is including dismantling first end 1 and the joint portion 3 of connection, and one side that joint portion 3 is close to first end 1 is provided with the reciprocal slide rail 43 that supplies the motion of reciprocal slider 44, and one side that first end 1 is close to joint portion 3 is provided with holding chamber 11, and holding chamber 11 is used for holding transmission 4. One side that the first end portion 1 was kept away from to joint portion 3 of this embodiment is provided with second end portion 2, and second end portion 2, first end portion 1 and joint portion 3 are for dismantling the connection. Be provided with a plurality of first fixed orificess on the joint portion 3 of this embodiment, first end 1 corresponds first fixed orificess and is provided with a plurality of second fixed orificess, and second end 2 corresponds first fixed orificess and has put a plurality of third fixed orificess, and first fixed orifices, second fixed orifices and third fixed orifices are used for passing bolt and/or bolt, and then with first end 1, joint portion 3 and second end 2 fixed an organic whole.

Example 3: the eccentric wheel of the embodiment comprises an eccentric pin and a flange plate 42, wherein a rotating hole for connecting an output shaft of the motor 41 is formed in the center of the flange plate 42, a plurality of positioning holes for inserting the eccentric pin are formed in the flange plate 42 in a surrounding mode around the rotating hole, and the eccentric pin is clamped on the reciprocating slide block 44. The one end that the eccentric pin was connected to reciprocal slider 44 of this embodiment is provided with joint portion 3, is provided with horizontal recess on the joint portion 3, and the width of horizontal recess slightly is greater than the diameter of eccentric pin to hold the eccentric pin and slide in the recess, drive joint portion reciprocating motion.

Example 4: the transmission gear set of the embodiment includes a duplicate gear 45 and an intermediate gear 46, the duplicate gear 45 includes a first gear portion and a second gear portion that rotate coaxially, the first gear portion is engaged with the rack, the second gear portion is engaged with the intermediate gear 46, and the intermediate gear 46 is engaged with the winglet gear 47. The eccentric pin on the flange 42 arranged on the shaft of the motor 41 is used as a cam, the cam is inserted into the transverse groove on the reciprocating slide block 44, the motor 41 drives the flange 42 to rotate, so that a rack motion reciprocating according to a sine relation can be generated (positioning holes with different eccentric distances on the flange 42 correspond to different angle ranges, the eccentric pin is detached and inserted into different positioning holes before the angle state is changed every time), the reciprocating motion of the rack drives the transmission gear set and then is transmitted to the winglet gear 47, and the inverse arc winglet 5 can be driven to do sine oscillation swing. The rack and pinion and the gear set have fidelity characteristic and motion continuity, and can drive the anti-arc winglet 5 to generate accurate and stable sinusoidal oscillation motion.

Example 5: the anti-arc winglet 5 of this embodiment reduces along wing section leading edge to trailing edge direction thickness gradually, and anti-arc winglet 5 is provided with convex arc portion near the one end of wing section leading edge, and the one end that main rotor is close to anti-arc winglet 5 is provided with the concave arc portion with convex arc portion matched with. The winglet gear 47 of this embodiment rotates coaxially with the convex arc. The oscillating angle of the anti-arc winglet 5 of the present embodiment satisfies a sine function with time. The root at main rotor is set up to joint portion 3 of this embodiment, and joint portion 3's thickness is greater than the thickness of first end 1 and second end 2.

Example 6: the swing center of the reverse-arc winglet 5 is 25 percent of the chord length of the main rotor wing away from the trailing edge; the reverse-arc winglet 5 takes a position 75% of the chord length of the main rotor wing as a swing center, the swing balance attack angles are respectively 0 degrees, 5 degrees and 10 degrees, the swing amplitudes are respectively 3 degrees, 8 degrees and 15 degrees, and the oscillation frequency is continuously changed from 0.1Hz to 15Hz (the reason is the same as the above). The curved and deformed anti-arc winglet (5) is used for the root of a rotor blade, and the airfoil profile is in the shape of a classical airfoil profile in the conventional flight process of a helicopter; when flying ahead at high speed, the curved airfoil shape only needs to be slowly folded back along with the change of the flying speed (quasi-static deformation); or the airfoil may change shape once per revolution, which requires faster drive, but may result in better overall performance. Changing the geometry only in the vicinity of the inboard trailing edge region of the blade may produce a similar effect of adjusting the pitch of the blade section; in addition, the actuator or structure for deformation inside the blade will be subjected to minimal centrifugal forces.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.