相阵列技术在民机机体气动噪声研究中的应用

摘要

Microphone phased array technique is one of the most important means of the air-frame noise research.Microphone phased array technique was investigated to study the airfame noise in closed wind tunnels.An array optimization method was developed for the aeroacoustic measurement in closed wind tunnels,and the arrays for surveying high lift noise and landing gear noise are designed separately.Based on the phased array technique,the noise of scaled high lift device and landing gear of a civil airplane are surveyed in the closed wind tunnel.It can be conclu-ded from the experiment results that the major noise sources are identified by the phased array technique and the efficiency of the noise reduction are verified.%麦克风相阵列测量技术是进行民机机体气动噪声研究的主要手段。针对民机机体气动噪声，开展了闭口风洞麦克风相阵列测量技术研究。提出了一种适用于闭口风洞气动噪声测量的阵列优化设计方法，分别设计了适用于民机增升装置、起落架气动噪声测量的阵列。将麦克风相阵列技术应用于某飞机增升装置缩比模型、起落架缩比模型气动噪声闭口风洞试验。研究结果显示：利用侧壁阵列清晰地识别出了增升装置主要气动噪声源，并显示出降噪措施的降噪效果；利用组合阵列，实现了较宽频率范围内起落架气动噪声源探测，识别出了起落架主要气动噪声源。