通过数值计算的方法对冲压转子中的三维流场以及轮毂抽吸后的流场进行了分析。研究发现,冲压转子中,轮毂处的分离影响了叶根至70%叶高截面的流动,轮毂处的角区分离限制了冲压转子的性能,使之只能工作在较低的背压工况下。而通过轮毂抽吸可以改善角区流动,提高冲压转子的压比和效率,并且抽吸位置在分离起始点位置时,效果最好。在抽吸流量占进口质量流量的0.5%时,效率可提高4%,压比提高20%。
A numerical investigation of three-dimensional flow filed and hub wall boundary layer suction through ramrotor has been presented in this paper.Three-dimensional separations,which form over the suction surface and hub wall corner of the blade passage,restrict the pressure ratio and efficiency of ramrotor.The corner separations affected the flow from hub to 70 percent span, and this make the ramrotor can only operated at a condition that back pressure is very low.The removal of the separated region from the end wall is confirmed by a numerical investigation involving the streamline near the corner and relative Mach number distribution at some distinctive surface. The improved passage flow field is characterized by increased blade loading and enhanced pressure ratio.It is found that the beginning of the separation is the optimal position for suction and the total pressure ratio and the efficiency could be increased by 20%and 4%respectively,while the suction mass flow account for 0.5%of inlet mass flow.
参考文献
| [1] | 韩吉昂 .旋转冲压压缩转子进气流道数值仿真及性能研究[D].哈尔滨工业大学,2009. |
| [2] | 肖翔,赵晓路,徐建中.高压比旋转冲压叶轮研究[J].工程热物理学报,2008(05):759-762. |
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