论文部分内容阅读
一、引言 透平在高背压或低负荷下运行时,末级叶片将处于大负攻角下工作,由此产生的分离流是造成叶片失速颤振的根本原因之一。国外对此研究日益重视。Joslyn和Dring等为考察分离对叶片换热的影响,研究了透平叶栅负攻角分离流动,他们应用流动显示方法及简单的气动测量,求得了分离点与再附壁点的位置,但文章没有进一步阐述内部流场的性质及分离流流型。
I. INTRODUCTION When the turbine is running under high back pressure or low load, the final blade will work under a large negative angle of attack. The resulting separation flow is one of the fundamental causes for the flutter of the blade. Foreign countries attach more importance to this research. Joslyn and Dring et al. Investigated the effect of the separation on the heat transfer of the blades. The separation of the negative angles of attack of the turbine cascades was studied. They applied the flow display method and simple aerodynamic measurements to determine the positions of the separation points and the re-attachment points. The article does not elaborate further on the nature of the internal flow field and the separation of flow patterns.