摘要
以某矿用离心风机为研究对象,基于三维不可压缩雷诺时均Navier-Stokes方程和Standard k-ε湍流模型对此风机进行数值模拟研究。风机气动性能试验验证了数值模拟的准确性。在噪声源分析的基础上,采用阶梯蜗舌结构降低其气动噪声辐射,并给出了此种结构的降噪机理。此降噪机理为:阶梯蜗舌结构使得风机在噪声源区域产生不同的压力脉动波形,从而形成一个相位差,抵消了噪声源区域部分压力脉动,致使阶梯蜗舌覆盖高位区域噪声源强度有所减弱。
A numerical simulation method based on the three-dimensional impressible time-average Navier-Stokes equations and Standard κ-ε turbulent flow model was used in a mine centrifugal fan. The aerodynamic performance of numerical simulation shows a good agreement with the experimental one. A stepped tongue, which based on the analyzed results of noise source, was designed to reduce the fan aerodynamic noise, giving the noise reduction mechanism of the steeped tongue. The mechanism of fan noise reduction is that the phase offset of the different segment on the tongue decrease the superposition of pressure fluctuations amplitude in the tongue region.
出处
《煤矿机械》
2017年第1期21-23,共3页
Coal Mine Machinery
关键词
离心风机
气动噪声
阶梯蜗舌降噪
centrifugal fan
aerodynamic noise
noise reduction of steeped tongue
