Apparatus used for helicopter rotor blade-vortex interference noise experiment

Abstract

The invention discloses an apparatus used for a helicopter rotor blade-vortex interference noise experiment. The apparatus comprises a blade wallboard, an ear sheet, a bolt group, sleeves, an angle fixing bolt, a supporting seat, a driving device, a second rotor wing, a first rotor wing and a propeller hub. The first rotor wing and the second rotor wing sleeve a rotating shaft through the sleeves. Through installing the sleeves with different length, a distance between the two rotor wings can be adjusted. Through rotating the sleeve, an included angle of the first rotor wing and the second rotor wing can be adjusted. And the angle fixing bolt is used to screw and fix the three so that the included angle of the first rotor wing and the second rotor wing is fixed. A noise level of the setting rotor wings is always greater than that of a common rotor wing, which can be effectively used in a rotor wing blade-vortex interference noise experiment. By using the apparatus of the invention, cost of the blade-vortex interference noise experiment is greatly saved, which is good for middle-and-small-sized laboratory to carry out research on the helicopter rotor blade-vortex interference noise.

Description

technical field [0001] The invention relates to the technical field of aerodynamic noise experiments, in particular to a device for helicopter rotor blade-vortex interference noise experiments. Background technique [0002] Rotor propeller-vortex interference noise is a unique noise of helicopters. Propeller-vortex interference will appear in flight states such as ramping down and sharp turns. When typical propeller-vortex interference noise occurs, the noise sound pressure level will increase by more than 10dB, and the detection distance will increase by more than three times. This is very serious noise. In order to study the characteristics of rotor-vortex interference noise and noise reduction, it is necessary to carry out experiments on this type of noise. At present, there are two types of helicopter rotor propeller-vortex interference noise experiments: acoustic wind tunnel and field flight experiments. [0003] The first type of acoustic wind tunnel experiment is ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the disadvantages of the existing propeller-vortex interference noise experiment (acoustic wind tunnel, full machine outfield) equipment requirements, complex process, high cost, etc., the present invention proposes a propeller-vortex interference noise experimental device, which can be used without wind Under the conditions of expensive and complicated experimental facilities such as holes, the helicopter rotor propeller-vortex interference noise is simulated, and two types of propeller-vortex interference noise experiments are conveniently carried out

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