Large-advance-ratio rotor blade reverse flow velocity active control trailing edge winglet device

A rotor blade and active control technology, applied in the field of helicopter rotors, can solve the problems of not being able to adapt to high-speed helicopters, increase the resistance of backward blades, and reduce cruise efficiency, so as to alleviate the aerodynamic problem of reverse flow and control the reverse stall speed

Active Publication Date: 2021-11-05
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such airflow is easy to generate separation, resulting in a sharp increase in the resistance of the backward blades and a significant reduction in cruise efficiency
The airfoil has not been specially designed for the flow characteristics of the rotor reflux area, and cannot meet the needs of high-speed helicopters; therefore, there is an urgent need for a large forward ratio rotor blade reflux that can control the reverse stall and is suitable for high-speed helicopters. Actively Controlled Trailing Edge Winglets

Method used

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  • Large-advance-ratio rotor blade reverse flow velocity active control trailing edge winglet device
  • Large-advance-ratio rotor blade reverse flow velocity active control trailing edge winglet device
  • Large-advance-ratio rotor blade reverse flow velocity active control trailing edge winglet device

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1: See Figure 1 to Figure 4 , a large forward ratio rotor blade anti-stall active control trailing edge winglet device of the present embodiment comprises a main rotor and an anti-arc winglet 5 arranged on the trailing edge of the main rotor, and a transmission device 4 arranged inside the main rotor , the transmission device 4 is used to drive the anti-arc winglet 5 to do sinusoidal oscillating motion; the main rotor includes a motor 41, an eccentric wheel, a reciprocating slider 44 and a transmission gear set, and the motor 41 drives the eccentric wheel to rotate, and then drives the reciprocating slider 44 to make a straight line Reciprocating motion, the end of the reciprocating slider 44 away from the eccentric wheel is provided with a rack, the rack is engaged with the transmission gear set, the anti-arc winglet 5 is provided with a winglet gear 47 engaged with the transmission gear set, and the rack drives the transmission gear set Rotate, and then drive...

Embodiment 2

[0026] Embodiment 2: The transmission device 4 of this embodiment is arranged inside the main rotor. The main rotor includes a detachably connected first end 1 and a clamping part 3. The side of the clamping part 3 close to the first end 1 is provided with For the reciprocating slide rail 43 for the reciprocating slider 44 to move, the side of the first end 1 close to the clamping part 3 is provided with an accommodating cavity 11 , and the accommodating cavity 11 is used to accommodate the transmission device 4 . In this embodiment, the side of the clamping part 3 away from the first end 1 is provided with a second end 2 , and the second end 2 , the first end 1 and the clamping part 3 are detachably connected. A plurality of first fixing holes are provided on the clamping part 3 of this embodiment, and a plurality of second fixing holes are arranged on the first end 1 corresponding to the first fixing holes, and how many positions of the second end 2 are corresponding to the f...

Embodiment 3

[0027]Embodiment 3: The eccentric wheel of this embodiment includes an eccentric pin and a flange 42, the center of the flange 42 is provided with a rotating hole for connecting the output shaft of the motor 41, and the flange 42 is provided with a rotating hole around the rotating hole for inserting The eccentric pins are connected to a plurality of positioning holes, and the eccentric pins are clamped on the reciprocating slider 44. One end of the reciprocating slider 44 in this embodiment connected to the eccentric pin is provided with a clamping part 3, and a transverse groove is arranged on the clamping part 3. The width of the transverse groove is slightly larger than the diameter of the eccentric pin to accommodate the eccentric pin in the groove. sliding inside to drive the clamping part to reciprocate.

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Abstract

The invention discloses a large-advance-ratio rotor blade reverse flow velocity 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, a transmission device is arranged in the main rotor, and the transmission device is used for driving the reverse arc winglet to do sinusoidal oscillation motion; the transmission device comprises a motor, an eccentric wheel, a reciprocating sliding block and a transmission gear set, the motor drives the eccentric wheel to rotate so as to drive the reciprocating sliding block to do linear reciprocating motion, a rack is arranged at the end, away from the eccentric wheel, of the reciprocating sliding block and meshed with the transmission gear set, a small wing gear meshed with the transmission gear set is arranged in the reverse arc small wing, and the rack drives the transmission gear set to rotate so as to drive the small wing gear to rotate. The reverse arc winglet does sinusoidal oscillation motion on the rear edge of the main rotor, the rear edge is reversely folded through curved surface deformation, the wing type rear edge can be more tightly aligned with oncoming airflow, and therefore the reverse flow aerodynamic problem is greatly solved, and the reverse flow velocity is controlled.

Description

technical field [0001] The invention relates to the field of helicopter rotors, in particular to a device for actively controlling trailing edge winglets with a large forward ratio rotor blade anti-stall. Background technique [0002] When the helicopter is flying forward with a certain forward ratio μ, due to the superimposed effect with the incoming flow, the relative airflow velocities between the forward blade area and the backward blade area of ​​the rotor are asymmetric. In the backward blade area, the relative radius r is less than μR|sinψ| a section of the blade, there will be a phenomenon that the relative airflow blows from the trailing edge to the front edge, and the area where this phenomenon exists is called the "reflux zone"; in the reverse flow zone The aerodynamic efficiency of the inner blade is low, there is a serious flow separation phenomenon, and it is prone to stall. There are obvious differences in the angle of attack, lift, drag, and pitching moment c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64C27/467
CPCB64C27/467
Inventor 姜裕标李国强杨永东车兵辉覃晨
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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