非轴对称端壁造型技术在透平中的应用和发展

非轴对称端壁的设计和应用可以有效地减少透平叶栅中的二次流损失,提高透平机械通流部分的气动性能。对非轴对称端壁造型技术的应用背景、端壁造型方法及其在透平机械中的研究现状进行了综述,详细介绍了非轴对称端壁对叶栅和透平级气动性能的影响,阐述了气动性能得以提高的机理,结合实验结果介绍了非轴对称端壁对叶栅和透平级变工况特性的影响。在透平叶栅非轴对称端壁成型研究进展的基础上,对非轴对称端壁造型技术在高负荷透平叶片研发和叶片三维造型中的应用前景进行了展望。

Application and Development of the Non-Axisymmetrical Endwall Contouring in the Turbomachinery

Design and application of the non-axisymmetrical endwall contouring in the turbine have been proved to decrease the secondary flow losses effectively and improve the aerodynamic performance of the gas turbine.The application background and the development of research about the non-axisymmetrical endwall contouring are summarized and the method of the endwall is generated.The effects of the non-axisymmetrical endwall contouring on the cascade and turbine stage are presented to demonstrate the reason of the performance improvement.Moreover,with the help of the experiment results,this paper also shows the influences of the non-axisymmetrical endwall contouring on the cascade and turbine stage in the off-design conditions.Finally,the applications of the non-axisymmetrical endwall contouring in the development of high loaded turbine blade profile and three-dimensional parameterized vane are presented.