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Experimental investigation on aerodynamic and noise characteristics of fenestron

Chinese Journal of Aeronautics 2023年第12期36卷 88-101页

作者： Bo WANG Wei ZHANG Fei WANG Qijun ZHAO Chenkai CAO Yuan GAO National Key Laboratory of Rotorcraft Aeromechanics Nanjing University of Aeronautics and AstronauticsNanjing 210016China China Helicopter Research and Development Institute Jingdezhen 333001China

It is difficult to simulate the strong interference and serious flow separation of fenestron by the CFD method based on the widely used RANS equation,and the detailed experimental data,which could be used to validate the aerodynamic and noise numerical methods,is *** experimental investigation on the aerodynamic and noise characteristics of fenestron is carried *** view of the complex internal flow field in duct and the relative motion between the stationary duct and the rotating rotor,a comprehensive aerodynamics and pressure measurement scheme is designed based on the bottom support *** this measurement scheme,the thrust generated by the rotating rotor can be measured by the rotating shaft balance,the thrusts from fenestron are measured by the external balance and the pressures on duct inner wall are monitored by a pressure measuring *** fully capture the noise directionality of fenestron,a series of noise observers located at an arc array are *** terms of the fenestron test models,the baseline model,the performance improvement model based on the high-performance tail rotor and the noise reduction model based on the non-uniform blade distribution are designed *** the designed measurement scheme,aerodynamic forces and pressure distributions and noise were measured for the three different fenestron *** results show that the aerodynamic thrusts of the tail rotor and duct increase greatly and the noise increases slightly for the performance improvement model because of the larger *** rotor aerodynamic performance of the noise reduction model is reduced,but the modulation effect of the tail rotor improves the forces of the *** noise radiated by the noise reduction model is reduced and a good noise reduction result is obtained in frequency domain.

关键词： Helicopter fenestron Aeroacoustic wind tunnel Noise reduction Non-uniform rotor

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