水轮机活动导叶调节运动动态绕流的大涡模拟  

Large eddy simulation of turbulent flow around moving guide vane of adjusting hydro turbine

作　　者：黄剑峰[1] 张立翔[1] 郭亚昆[2] 

机构地区：[1]昆明理工大学工程力学系,云南昆明650051 [2]阿伯丁大学工程系

出　　处：《排灌机械工程学报》2013年第8期702-707,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51279071;50839003)

摘　　要：为探索上游管道系统水力暂态和水轮机暂态过程耦合的机理,基于三维非定常不可压缩黏性流体的N-S方程,采用浸入边界法(IBM)处理活动导叶运动产生的动边界,大涡模拟(LES)的亚格子应力(SGS)使用Smagoringsky-Lilly动态模型,精细模拟了槽道中混流式水轮机活动导叶关闭过程中产生的动态绕流,捕捉了导叶动态绕流的压力和尾迹结构及其随时间变化的规律.结果表明:活动导叶的调节运动动态绕流将产生大量复杂的瞬态流动结构,其向上在管道系统中诱发水击波动,向下影响转轮叶道中的暂态特性.基于Smagoringsky-Lilly动态SGS模型的LES-IBM方法可有效地模拟高雷诺数下活动导叶关闭运动与叶道湍流之间的相互作用过程,揭示水轮机调节过程中活动导叶动态绕流尾迹结构产生的机制及其向下游方向的演化特性.To investigate transient hydraulic process of upstream duct system and hydro turbine,based on the incompressible viscous Navier-Stokes equations and immersed boundary method（IBM） for moving boundary,using the dynamical subgrid stresses（SGS） on Smagorinsky-Lilly model in large eddy simulation（LES）,a delicate numerical simulation of three dimensional turbulent flow around one moving guide vane of a benchmark hydro turbine unit in a channel was conducted.The distributions of the pressure and the topological structures of wake were well captured as closure of the vane.The production and evolution of the wake vortices passing the kinetic guide vane was clearly shown,and the physics of the structures were analyzed.The results show that the flow around a moving guide vane will produce numerous complex transient structure which induces water hammer of upstream duct system and transient behavior of downstream runner passage.The numerical results show that the numerical method of LES-IBM with dynamical Smagorinsky-Lilly SGS model can be used to well simulate the interaction between high Reynolds number turbulent flow with motion of the vane closure,revealing the mechanism evolution properties of the wake to the downstream in the hydro turbine adjustment process.

关 键 词：水轮机导叶 动态绕流 尾迹流 浸入边界法 大涡模拟 

分 类 号：TK730.2[交通运输工程—轮机工程]