亚音速轴流风扇静转子相互作用线谱噪声预报

静转子相互作用线谱噪声是亚音速轴流风扇主要噪声源之一，快速预报该噪声对风扇设计初期的叶片选型和参数设计具有重要意义。因此在叶栅响应函数理论的基础上考虑静转子叶片的相互作用，采用叶片经验尾流模型模拟转子尾流，推导得到静转子叶栅相互作用线谱辐射声功率半经验半理论计算公式。通过与NASA已有的试验模型和计算模型结果对比，验证了该公式的适用性。并进一步分析静转子间距、叶片参数等对NASA试验风扇线谱噪声的影响，结果表明，增大静转子间距和静子叶片倾斜设计对降低静转子相互作用线谱噪声具有很好的效果。

Tonal noise prediction of interaction between stator and rotor of subsonic axial fan

The tonal noise, radiated by interaction between stator and rotor, is the main noise source of the subsonic axial fan. A rapid method to predict the noise is significant to the parameter design in early stage of the fan low radiation noise design. Therefore, a semi-analytic prediction formula of the power of radiated tonal noise of the interaction between stator rotor cascade was derived, by considering the interaction of stator and rotor blades based on the cascades response function theory, and by simulating the rotor wakes using empirical rotor wake model. The applicability of the formula was verified by comparing with the results of the existing experimental model and computational model from NASA. Based on NASA experiment model, the effect of rotor-stator spacing and stator blade parameters on tonal noise of fan was analyzed further. And the results show that increase of the rotor-stator spacing and lean design of stator blades suppresses the tonal noise caused by the interaction between stator and rotor effectively .