一种控制微涡轮叶尖泄漏流的新技术(英文)

提出了一种逆向涡流发生器控制叶尖泄漏流的新技术,利用压力面和叶顶面的压力差将气流从压力面引入,在叶顶面逆着叶尖泄漏流方向高速射出从而控制和减小叶尖泄漏流。对某典型毫米尺度涡轮叶栅进行了有/无逆向涡流发生器流场的数值研究,分析了逆向涡流发生器对流场及叶栅性能的影响。结果表明在典型进口条件下,逆向涡流发生器使得叶尖间隙泄漏流量降低了2.8%,周向载荷升高了7.7%;与无逆向涡流器情形相比,有逆向涡流器时涡轮效率提高了约1.2%。

NEW TECHNIQUE FOR CONTROLLING TIP LEAKAGE FLOW OF MICRO TURBINE

A new technique for controlling the tip leakage flow of micro turbine is presented. It uses backward vortex generators (BVGs) to control and reduce the tip leakage flow. The gas is driven by the pressure difference between pressure surface and blade tip, so it flows into BVGs from the pressure side of blade and flows out from the blade tip with high speed in the inverse-direction of leakage flow. Numerical simulations of typical turbine cascade in millimeter scale with and without BVGs are performed. The influence of BVGs on the flow fields and the performance of cascade is analyzed. The results show that the mass of leakage flow decreases by 2.8% and the circumferential load increases by 7.7% under typical entrance condition. Moreover, compared with the case without BVGs, the turbine efficiency grows about 1.2 % in case with BVGs.