射流噪声测量中远场测量边界影响研究  

Influences of far field measurement boundary on jet noise measurements

作　　者：张俊龙 雷红胜 赵鲲 马瑞轩 李杰[1] ZHANG Junlong;LEI Hongsheng;ZHAO Kun;MA Ruixuan;LI Jie(School of Aeronautics,Northwestern Polytechnic University,Xi’an 710072,China;Key Lab of Aerodynamic Noise Control,China Aerodynamic Research and Development Center,Mianyang 621000,China)

机构地区：[1]西北工业大学航空学院,西安710072 [2]中国空气动力研究与发展中心气动噪声控制重点实验室,四川绵阳621000

出　　处：《振动与冲击》2020年第21期47-54,共8页Journal of Vibration and Shock

摘　　要：射流噪声实验是射流噪声产生机理及降噪措施研究的最重要手段之一。为确保射流噪声远场测量数据可信,远场传声器的布置需在远场条件和最终数据的信噪比之间进行合理的选取。通过严格的射流噪声模拟装置,采用精细的声学测量及修正手段,系统的研究了射流噪声不同测量角度及位置、不同射流速度等因素对远场测量结果的影响规律,并对射流噪声频谱随距离的增加而变化的特性进行了机理分析。通过试验确定了射流噪声远场测量时的最小远场边界条件,对于不满足远场边界条件的远场噪声测量,给出了适当的修正的方法。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.

关 键 词：射流噪声 气动噪声测量 远场测量 消声室 数据修正 

分 类 号：V211.7[航空宇航科学与技术—航空宇航推进理论与工程] O358[理学—流体力学]