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http://dx.doi.org/10.5139/JKSAS.2004.32.3.010

Development of a Helicopter Rotor Test Rig and Measurement of Aeroacoustic Characteristics  

Rhee, Wook (한국항공우주연구원)
Choi, Jong-Soo (충남대학교 항공우주공학과)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.32, no.3, 2004 , pp. 10-16 More about this Journal
Abstract
In this paper the aeroacoustic characteristics of a helicopter main rotor system is measured by using a pair of scaled rotor blades. A low noise rotor test jig is developed for noise measurement and the rotational speed, thrust and torque are measured simultaneously in order to match the aerodynamic conditions with the full scale rotor. The accuracy of the force measurement device was checked through a calibration procedure. The measured thurst and torque with a 1.2m rotor are compared to the results of analytical prediction and showed that the thrust data at various rotational speed followed the prediction relatively well, but the torque data considered less accurate. It is also found that the background noise level of the test rig is sufficiently low, and the measured noise level from the rotor can be scaled with rotor tip speed. However, the Mach number dependancy and the directivity changes depend on the noise source characteristics.
Keywords
Helicopter Noise; Main Rotor Noise; Thrust and Torque Measurement; Non-dimensionalization; Noise Directivity;
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  • Reference
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