透平级非轴对称端壁叶片气动性能研究

Aerodynamic Analysis of HP Turbine Using Nonaxisymmentric End Walls

非轴对称端壁造型优化技术是控制叶轮机械叶栅内流动的关键技术,以非轴对称端壁曲面造型的方法代替原始的轴对称端壁结构,叶轮机械端壁造型的优化主要可以起到减小二次流带来的端部损失的作用,改变壁面附近压力分布,实现对涡轮内部流动的控制。本文应用数值模拟的方法计算并分析了冲动式汽轮机高压缸级和反动式汽轮机高压缸级在带有密封结构条件下的气动性能,建立了非轴对称端壁造型优化方法,对冲动式及反动式各高压缸端壁造型进行了优化,并将带有优化后造型的高压缸气动性能与轴对称端壁情况高压缸气动性能进行了对比分析,验证了优化方法的可行性与有效性。结果表明,非轴对称端壁优化造型可使冲动级和反动级效率有所提高,并且可以减小靠近叶栅根顶部流动损失,使得出口气流分布更加均匀。

the non-axisymmentric end walls is the key technology to control the flow in turbine cascade,with respect to the axisymmentric design,it can reduce the end secondary flow losses by the way of changing the pressure distribution of end walls.This paper analyzes the aerodynamic performance of the impulse and reaction cascade of HP turbine with seals applying the technology of non-axisymmentric end walls,after comparison,the results show that applying the technology of non-axisymmentric end walls can improve the efficiency and other aerodynamic performance of the turbine cascade.