气体冲击喷流噪声的理论与实验研究  

Theoretical and Experimental Studies of Gas Wall Jet

作　　者：许伟伟[1] 吴大转[1] 卢蕊 陈一伟[1] 王乐勤[1] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027 [2]中船重工第705研究所,陕西西安710075

出　　处：《工程热物理学报》2013年第9期1659-1662,共4页Journal of Engineering Thermophysics

基　　金：中央高校基本业务费资助项目

摘　　要：为研究高速气体冲击喷流噪声机理和控制途径,对气流冲击挡板的噪声特性进行了实验研究,并对噪声机理进行理论分析。高速气流喷流不同表面材质挡板的噪声实验表明,挡板表面材质弹性模量越小,气流喷注挡板的噪声越小。弹性模量小的材质容易吸收气体能量,降低作用在挡板上脉动力幅值,进而降低了喷流冲击噪声。喷嘴与挡板之间距离对喷流噪声产生显著的影响,距离增大使得喷流总噪声减小,但低频噪声增大.高速气流冲击挡板时,气流冲击挡板产生的湍动能决定了喷流噪声的大小,改变挡板表面物性是降低喷流噪声的一个重要手段。The noise characteristics of the air impingement on a rigid wall are experimentally and theoretically investigated, in order to reduce the noise. It is indicated by the experiment in which high speed air impingement on surface of the baffle made by different materials that the less modulus of elasticity, the less noise. The material of low modulus of elasticity tents to absorb gas energy more easily and it reduces the amplitude of pulsating force effect on the baffle, thus reducing the noise of jets impact. The distance between nozzle and baffle have a significant influence on jet noise, it shows that the increases of distance reduce the jet noise. However, the low-frequency noise increases. Turbulent kinetic energy produced in the impact of high-speed airflow decides the sound level, so changing the material of the surface of baffle becomes an effective method to reduce the sound of noise.

关 键 词：喷流噪声 湍动能 降噪 挡板 实验研究 

分 类 号：O354.3[理学—流体力学]