风扇转子前缘曲线相对掠对性能的影响

本文从叶片前缘曲线掠的形式入手,采用适合叶轮机械内三维流动特点的相对掠概念,把叶片前缘曲线相对掠应用到设计中,探讨叶片前缘曲线相对掠(包括相对前掠、相对无掠和相对后掠)对通道激波的方位、强度的影响,以及由此造成的对风扇性能的影响,并进行了数值模拟,从得到的结果可以看出转子前缘曲线对风扇/压气机的性能影响非常明显,并对设计在气动方面的优化有一定的指导作用。 

Effects of Swept Leading Edge on Performance of Fans

According to the definition of the three-dimensional swept leading edge,a comparison was made between three different swept transonic rotors to study how different leading edges affect the position and intensity of shock waves,and consequently the performance of fans.Numerical analyses of their flow fields were done,and the results were compared with the study of Hah,C.(1998).The analyses indicate that the aerodynamic sweep can be used to control the shock structure not only at the mid-span but also near the casing by the end-wall effect,and has a different effect on the radial migration of low momentum fluid to the blade tip region.It can be concluded that the rotor leading edge shapes have a significant influence on the shock waves and the performance of fans.