某声学风洞轴流风扇设计（英文）

The Axial Flow Fan Design for an Acoustic Wind Tunnel

采用试验研究的方式,对某声学风洞的轴流风扇性能进行验证。该风扇采用了任意涡设计方法以达到所要求的气动指标要求;通过降低风扇转速、合理匹配桨叶-止旋片数目、调整桨叶-止旋片间距及止旋片后掠等方式,降低风扇噪声。风扇的性能测试结果表明,风扇满足了风洞试验段的最高风速要求,当风扇转速为650r/min时,风扇的级间效率达到90%、风扇段气动效率达到84%;当试验段风速达到70m/s时,风扇出口的声压级为114d B。该风扇的研制,表明采用任意涡风扇设计方法结合上述提到的降噪措施,能够设计出气动效率高、风扇噪声低的风扇系统,可很好的运用于其他的声学风洞设计中。

An experimental study on the design of an axial-flow fan for the 1.8-by 1.4-m acoustic wind tunnel was carried out. The fan was designed using arbitrary vortex method to improve the aerodynamic performance. The noise generated by the fan was reduced by lower fan rotation speed, more reasonably matched rotor-stator blade number,stator backward-swept angle and rotor-stator spacing. The aerodynamic test results show that the highest wind speed required in the test section is satisfied, and when the fan rotational speed is 650 rpm, the fan reaches the highest aerodynamic efficiency(90%) and the whole fan also has the highest aerodynamic efficiency(84%). Moreover, the acoustic test results show that the Overall Sound Pressure Level(OASPL) at the outlet is 114 d B when the wind speed in the test section reaches 80 m/s. The combination of the arbitrary vortex method with noise control methods is proved to be a good design approach for the axial fan of other acoustic wind tunnel.