YBT32-2型轴流式局部通风机噪声分布规律  

Noise Distribution Laws of YBT32-2 Axial Local Fan

作　　者：汤宗情 翟成[1] 武世亮 仲超[1] 徐吉钊 

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《煤矿安全》2015年第5期39-42,共4页Safety in Coal Mines

基　　金：中央高校基本科研业务费专项资金资助项目(2014ZDPY04);国家自然科学基金资助项目(51274195;U1361106);江苏省自然科学基金资助项目(BK2012571);国家重大科学仪器设备开发专项资助项目(2013YQ17046309);教育部新世纪优秀人才支持计划资助项目(NCET-12-0959)

摘　　要：选取YBT32-2型轴流式局部通风机作为研究对象,应用噪声计和噪声频谱测量仪采集分析局部通风机周围噪声强度和频谱分布规律。研究表明:由于局部通风机2级动轮叶片对气流的分级加速作用,风机出风口流速高于进风口,更高流速的流体与动轮叶片和机壳内壁的撞击、摩擦会产生更高强度的噪声,导致出风口噪声强度明显高于进风口噪声强度;轴流式局部通风机噪声主要来自2级动轮叶片切割气流所产生的噪声,进风口和出风口噪声高于局部通风机中部噪声,噪声强度在局部通风机机壳表面呈"V"字形分布;噪声声波向下传播抵达刚性壁面时会发生干涉加强现象,使得机壳下部噪声明显高于机壳上部噪声。噪声频谱测量试验表明,轴流式局部通风机出风口噪声和进风口噪声共性体现在两者都以中高频噪声为主,差异性表现为出风口噪声中低频噪声同样占有较大比例。Taking YBT32 -2 axial local fan as the research object, the noise intensity and spectrum distribution laws around local fan are collected and analyzed by noise meter and noise spectrum measuring instrument. The results show that because of the effect of airflow acceleration and classification by the two motor wheel blades of local fan, the velocity in outlets is higher than the one in inlets. The impact and friction between the higher velocity of the fluid, the pulley blade and casing wall will produce higher intensity noise, which causes the noise intensity in outlets is obviously higher than the one in inlets ; the noise of axial local fan mainly comes from two motor wheel blades cutting air flow. the noise of inlets and outlets is higher than the middle part of the fan, the noise intensity presents a ＂V＂ font distribution on the casing surface ; the interference strengthening phenomenon happens when noise sound waves propagate downward in the rigid wall, which makes the noise intensity of lower casing is significantly higher than the one of upper casing. The noise spectrum measurement experiments show that the noise of axial local fan in outlets and inlets is mainly medium and high frequency noise. However, the low -frequency noise in outlets is also a large proportion.

关 键 词：轴流式局部通风机 噪声来源 噪声强度 噪声分布 频谱分析 

分 类 号：TD441[矿业工程—矿山机电]