风机系统工作时的一个突出问题是其进风口与出风口产生的噪声。由于风机流场非常复杂,以及实验成本、条件等限制,基于CFD的理论逐渐成为风机噪声估计的重要方法。通过对风机及其冷却系统构成的封闭系统的原理性台架进行数值建模和仿真,判断出风机主要气动噪声源的位置和种类,提供一个可供参考的信息。结果表明:风机出口腔体内部非定常压力波动强度最大。 A prominent issue when working on a blower system is the noise generated by its air inlet and air outlet. Due to the complexity of fan flow field, as well as the limitations of experimental costs and conditions, the CFD-based theory has gradually become an important method for fan noise estimation. Through the numerical modeling and simulation of the principle gantry of closed system consisting of the fan and its cooling system, the position and type of the main aerodynamic noise source of the fan can be judged and provide a reference for reference. The results show that the intensity of unsteady pressure fluctuation inside the fan outlet cavity is the largest.