跨音透平中激波与边界层、尾迹干涉机理研究

Study on Interaction Mechanism of Shock Wave and Boundary Layer,Wake in Transonic Turbine

高负荷跨音透平导叶中,流动过程十分复杂,DDES方法在该条件下对流动细节地捕捉具有特殊优势。本文采用自主开发的DDES程序,获得可靠而精确的计算结果,研究跨音叶片内部的流动机理。根据不同区域的流动现象,作者分别研究叶片吸力面处,激波和边界层的相互作用;叶片尾流区,激波和尾迹的相互作用。并对这些区域进行熵生成情况分析,为后续跨音透平中的损失减小提供理论基础。

In the high load transonic turbine guide vanes, the flow is extremely complex and DDES has special advantages in capturing the details of flow. In this paper, the DDES program with a well-proved in-house code is used to obtain reliable and accurate results, and the internal flow mechanism of transonic blades is studied. According to the flow phenomena in different areas, the author studies the interaction of shock wave and boundary layer at the blade suction surface, and the interaction of shock wave and wake at wake region of the blade. And the entropy generation of these areas is analyzed, which provides the theoretical basis of the loss reduction in transonic turbine.