Influences of far field measurement boundary on jet noise measurements
ZHANG Junlong1, LEI Hongsheng2, ZHAO Kun2, MA Ruixuan2, LI Jie1
1.School of Aeronautics, Northwestern Polytechnic University, Xi’an 710072, China;
2.Key Lab of Aerodynamic Noise Control, China Aerodynamic Research and Development Center, Mianyang 621000, China
Abstract:Jet noise test is one of the most important means to study jet noise generation mechanism and denoising measures.In order to ensure the reliability of jet noise’s far field measurement data, a reasonable selection needs to be made between far field microphone layout condition and SNR of the final data.A strict design of jet noise simulation device and sophisticated acoustic measurement and correction method were used to systematically study influence laws of jet noise measuring angle and position, and jet speed, etc.factors on far field measurement results.The mechanism analysis was done for jet noise spectra variation features with increase in distance.Finally, the minimum far field boundary condition for far field measurement of jet noise was determined with tests, and an appropriate correction method was presented for far field jet noise measurements not satisfying far field boundary conditions.
张俊龙1,雷红胜2,赵鲲2,马瑞轩2,李杰1. 射流噪声测量中远场测量边界影响研究[J]. 振动与冲击, 2020, 39(21): 47-54.
ZHANG Junlong1, LEI Hongsheng2, ZHAO Kun2, MA Ruixuan2, LI Jie1. Influences of far field measurement boundary on jet noise measurements. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(21): 47-54.
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