声学引导风洞高效低噪声风扇设计

运用任意涡风扇设计方法,进行声学引导风洞高效低噪声风扇设计。在设计过程中,通过调整叶片径向旋转系数分布优化叶片出口速度分布,通过合理匹配转子、定子数目及定子后掠角度来改善动静叶的干涉噪声。气动及声学性能试验表明,高效低噪声风扇设计点气动效率达到83.9%,相比引导风洞原风扇效率的73%有了明显的提高;高效低噪声风扇入口及出口噪声分别比原风扇入口及出口噪声低3dB（A）和2dB（A）。试验结果成功验证了任意涡设计方法在风扇气动及声学性能上的优越性。

The design of the high-performance low-noise fan of the acoustic pilot wind tunnel

Arbitrary vortex method is used to design a high-performance low noise fan for the acoustic pilot wind tunnel. In the design, a more well-distributed axial speed at the outlet of fan system is obtained by regulating the rotating speed distribution,the noise generated by rotor stator interaction is reduced by matching more reasonable rotor-stator blade number and stator back- ward-swept angle. According to the results of the fan aerodynamic and acoustic experiments, the efficiency of the high-performance low-noise fan is 83.9% at its design point, which is an obvious improvement compared with the original fan setting in acoustic pilot wind tunnel （73%）, meanwhile, the inlet noise of high performance low noise fan is 3dB（A） lower than the inlet noise of original fan, and the outlet noise of high-performance low-noise fan is 2dB（A） lower than the out-let noise of the original fan. The experimental results indicate that arbitrary vortex method has significant advantage in fan aerodynamic and acoustic performances.