An experimental study of noise generated by tandem blades  

作　　者：Xiaolong TANG Fan TONG Chao WANG Jue DING Guangming LI Xiaoquan YANG 

机构地区：[1]Shanghai Institute of Applied Mathematics and Mechanics,Shanghai Frontier Science Center of Mechanoinformatics,Shanghai Key Laboratory of Mechanics in Energy Engineering,School of Mechanics and Engineering Science,Shanghai University,Shanghai 200072,China [2]Key Laboratory of Aerodynamic Noise Control,China Aerodynamics Research and Development Center,Mianyang 621000,China [3]Equipment Design and Testing Technology Research Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China

出　　处：《Chinese Journal of Aeronautics》2025年第2期143-160,共18页中国航空学报(英文版)

基　　金：supported by grants from the National Natural Science Foundation of China(Nos.12102451,12072186);the National Science and Technology Major Project,China(No.J2019-II-0006-0026);AVIC Aerodynamics Research Institute,China(No.XFX20220201).

摘　　要：To facilitate the low-noise design of tandem lift bodies as applied in aeroengines and aircraft,the acoustic features of tandem blades are investigated by wind-tunnel experiments.This is further specialized for the rotating blades applied in contra-rotating open rotors under the concept of frozen-rotor.A 70-channel phased microphone array and nine high-precision free-field microphones are employed.The beamforming method,enhanced by a source filtering technique,is employed to locate noise sources,providing insights into the source patterns of blade-blade interaction noise concerning flow speed,blade spacing,and aft blade clipping.The results show the following:(A)Sources of tandem-blade noise exist in the form of concentrated source clusters,resulting in two major clusters:the mid-span interaction noise and the tip-induced noise.(B)These source clusters tend to separate as flow speed or blade spacing increases.(C)By increasing blade spacing,the band-pass filtered overall sound pressure level is reduced by 2.9 dB.(D)A two-phase noise suppression pattern is observed with blade clipping,resulting in a total reduction of 3.0 dB for the interaction noise through the removal of tip-induced noise sources and the replacement of mid-span noise sources.Based on these findings,suggestions concerning blade spacing and clipping are discussed.

关 键 词：Tandem blades Contra-rotating open rotor Noise BEAMFORMING Blade spacing and clipping Wind tunnel test 

分 类 号：O35[理学—流体力学]