排灌机械工程学报
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排灌机械工程学报  2014, Vol. 32 Issue (9): 783-787    DOI: 10.3969/j.issn.1674-8530.13.6057
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基于反馈力浸入边界法的水轮机双列叶栅动态绕流特性
王文全, 苏仕琪, 张立翔
昆明理工大学土木工程学院, 云南 昆明 650500
Investigation into unsteady flow around tandem cascade of Francis turbine by employing immersed boundary method with feedback force
Wang Wenquan, Su Shiqi, Zhang Lixiang
Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, Yunnan 650500, China
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摘要 为了解决柔性结构体或刚性结构体与黏性流体相互作用产生的影响,采用网格生成简单,计算效率较高,适用于复杂结构外形浸入边界法进行处理,避免了贴体动网格生成的困难,相比传统的浸入边界法主要适用于柔性体,对于刚性边界问题Lai和Peskin使用反馈力近似处理.文中基于此方法对水轮机双列叶栅动态绕流特性进行数值模拟.在整个流场中使用笛卡儿自适应加密网格,利用有限差分法进行离散求解.通过数值计算,得到水轮机双列叶栅的流场分布特性以及导叶尾迹区内各流向断面压力、速度以及涡量分布的不均匀度指标.计算成果为进一步研究导叶动态绕流形成的不均匀流场对水轮机叶片流激振动的影响提供参考.
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王文全
苏仕琪
张立翔
关键词流固耦合   浸入边界法   反馈力   混流式水轮机   双列叶栅     
Abstract: The immersed boundary method(IBM)is one of important numerical methods for solving the interaction between flexible structure with large deformation or rigid structure and viscous fluid. The advantages of IBM are high computational efficiency, suitable for complicated shape and simple grid structure which means a conformal mesh can be avoided and an adaptive mesh technique can be implemented easily. The original IBM is suitable for the flexible body and was updated with feedback force by Lai and Peskin to approximately deal with a rigid boundary problem. In this paper the unsteady flow around a tandem cascade of Francis turbine is simulated by this updated method. Particularly, the cartesian adaptive mesh refinement and finite difference method are applied in the whole flow field. The unsteady characteristics of the flow field, the non-uniformity indexes for pressure, velocity and vorticity in the guide vane wake are attained. These results are helpful to study on the effects of uneven flow field on fluid-induced blade vibration in a hydro-turbine in future.
Key wordsfluid-structure interaction   immersed boundary method   feedback force   Francis turbine   tandem cascade   
收稿日期: 2013-12-17;
基金资助:

国家自然科学基金资助项目(11262008,11002063);霍英东青年基金资助项目(141120)

通讯作者: 王文全(1977—),男,四川蓬安人,教授(wwqquan@126.com),主要从事水力机械研究.   
作者简介: 苏仕琪(1989—),女,吉林大安人,硕士研究生(sushiqi99@126.com),主要从事水力机械研究.
引用本文:   
王文全,苏仕琪,张立翔. 基于反馈力浸入边界法的水轮机双列叶栅动态绕流特性[J]. 排灌机械工程学报, 2014, 32(9): 783-787.
WANG Wen-Quan,SU Shi-Qi,ZHANG Li-Xiang. Investigation into unsteady flow around tandem cascade of Francis turbine by employing immersed boundary method with feedback force[J]. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(9): 783-787.
 
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