某型飞机起落架结构件气动噪声仿真与试验研究  

Simulation and Experiment Study on Aero-acoustic Noise of an Aircraft’s Landing Gear Structure

作　　者：许远[1] 龙双丽[1] 薛彩军[1] 聂宏[1] 

机构地区：[1]南京航空航天大学飞行器先进设计技术国防重点学科实验室,南京210016

出　　处：《航空工程进展》2012年第4期404-412,共9页Advances in Aeronautical Science and Engineering

基　　金：南京航空航天大学研究生创新基地(实验室)开放基金江苏省普通高校研究生科研创新计划(CX10B_105Z;CX10B_088Z);航空科学基金(2009ZA52001)

摘　　要：起落架噪声是飞机着陆阶段噪声的主要组成部分。以某型飞机前起落架为研究对象,通过分离涡模拟方法对其支柱及扭力臂结构件简化模型的周围流场进行非定常计算,利用FW-H方程积分法对各部件表面产生的声场进行求解,分析缓冲支柱及扭力臂结构件气动噪声的产生机制、声源特性。对该飞机起落架支柱及扭力臂结构件进行声学风洞试验,通过麦克风对噪声的测量获得结构件噪声频谱特性。仿真及试验结果均表明:支柱及扭力臂结构件气动噪声包含支柱和扭力臂引起的钝体扰流噪声和两者相对位置引起的干扰噪声,支柱噪声对总噪声的贡献大于扭力臂噪声,噪声辐射特性具有偶极子声源的辐射特性。Aircrafts＇ noise produced by landing gears is the main noise in the landing stage. Simulation analysis using Detached Eddy Simulation is performed to simulate the flow field around the simplified structure including the strut and torque link of an aircraft＇s nose landing gear. The acoustic field radiated from different model parts and total model are calculated via FW-H equation. The noise mechanism and acoustic characteristics of the noise from the structure are analyzed. Wind tunnel test is performed to measure the noise spectra of the structure by microphones. The simulation and experiment results show that the noise of the assembly of strut and torque link include bluff body and interaction noise. Noise from the strut has greater contribution to total noise than that from the torque link. The whole model noise radiation direetivity is similar to the dipole characteristics.

关 键 词：计算气动声学 起落架结构件 气动噪声 声类比 

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]