叶片前缘障碍物对轴流风机气动噪声的影响

Influence of blade leading edge obstacle on aerodynamic noise of axial flow fan

噪声已成为风机选型的重要指标,因此在设计和研发过程中必须将其作为重点考虑因素。文章以CZTY-400轴流风机为研究对象,基于湍流模型及宽频声学模型,采用计算流体力学(Computational Fluid Dynamics,CFD)软件进行数值模拟,探索通过合理设置叶片前缘障碍物减少叶片尾缘涡的脱落和压力脉动,以达到降低风机气动噪声的目的。结果表明:叶片前缘设置障碍物后,障碍物附近湍动能增大,而叶片尾缘湍动能下降;风机出口域的湍动能和噪声声压显著降低;压力脉动频域特性与噪声信号频域特性整体变化趋势相似,障碍物对低频处的噪声及压力脉动作用效果良好。

Noise has become an important indicator of fan selection,so it must be taken as a key consideration in the design and development process.The article takes CZTY-400 axial flow fan as the research object and adopts the Computational Fluid Dynamics(CFD)software for numerical simulation based on the turbulent flow model and the broadband acoustic model.It explores how to reduce the trailing edge vortex shedding and pressure pulsation by reasonably setting the blade leading edge obstacles,so as to achieve the purpose of reducing the aerodynamic noise of the fan.The results show that the turbulent kinetic energy near the obstacle increases and the turbulent kinetic energy at the trailing edge of blade decreases after the obstacle is installed at the blade leading edge.The turbulent kinetic energy and noise sound pressure at the outlet domain of the fan are significantly reduced.The overall variation trend of the pressure pulsation frequency domain characteristics is similar to that of the noise signal frequency domain characteristics,and the obstacle has a good effect on the noise and pressure pulsation at low frequency.