【摘要】 本文对轴流风机的噪声源进行了理论和实验分析,对降低风机噪声的方法进行了总结。在此基础上,研究了降低风机噪声的两种新方法——叶片不等距分布方法和叶片穿孔方法。理论分析和实验结果表明,这两种方法为降低轴流风机噪声提供了新的途径。更多还原

【Abstract】 The theoretical and experimental analyses of noise sources in axial flow fans are involved and the methods of noise reduction in fans are summarised in this paper. On the basis of those, two new methods of fan noise reduction are studied: (1) the application of non-isometric arrangement blades to reduce the discrete noise arising from aerodynamic interaction between fixed and moving blades;(2) the application of perforated blades to reduce the broad band noise arising from random vortex shedding at the blade trailing edges.Theoretical analyses and experimental results show that this two methods appear to offer new promise in reducing axial flow fan noise.更多还原