水轮机活动导叶关闭过程中导水机构内动态流场数值模拟研究

发布时间：2018-03-25 21:30

本文选题：水轮机导叶叶栅　切入点：浸入边界法　出处：《水利学报》2017年03期

【摘要】：水力机组在暂态过程中诱发的强瞬变流是一种复杂的非定常湍流,对机组安全稳定运行具有重要影响。为了探索水轮机活动导叶动态调节动作诱发叶后强瞬变流对机组暂态特性的影响,本文应用模拟流固耦合动态效应较好的浸入边界法和大涡模拟技术来处理该类强非线性动边界流体动力学问题。首先,精细模拟槽道内两级线性排列动静叶栅动态绕流叶后压力和尾迹结构分布,由于受到固定导叶和活动导叶动静干涉的影响,其下游流场表现出复杂的非定常流动特征。随后完成了水轮机导水机构两级非线性环列叶栅动态绕流的模拟,展现了水轮机导叶调节运动的关闭过程。该方法可用于水轮机流道内多级翼型叶栅绕流的精细模拟,为研究水轮机调节振荡对机组暂态性能的影响提供有益的参考,对耦合上游管道系统水力暂态和水轮机三维暂态效应的研究也有指导意义。
[Abstract]:The strong transient flow induced by hydraulic unit in transient process is a complicated unsteady turbulence. In order to explore the influence of the strong transient flow behind the turbine guide vane on the transient characteristics of the turbine, it has an important effect on the safe and stable operation of the turbine. In this paper, the immersion boundary method and the large eddy simulation technique are used to deal with the hydrodynamic problems of this kind of strongly nonlinear moving boundary, which are good at simulating the fluid-solid coupling dynamic effect. The pressure and wake structure distribution after the two stage linear arrangement of the static and static cascades in the channel are simulated in detail because of the influence of the static and static interference of the fixed guide vane and the active guide vane. The downstream flow field shows complex unsteady flow characteristics, and then the dynamic flow around the two-stage nonlinear annular cascade of the hydraulic turbine diversion mechanism is completed. This method can be used to simulate the flow around the multistage airfoil cascade in the turbine runner and provide a useful reference for the study of the influence of turbine governing oscillation on the transient performance of the turbine. It is also of guiding significance for the study of hydraulic transient and three dimensional transient effect of hydraulic turbine in coupled upstream pipeline system.
【作者单位】：云南农业大学水利学院;昆明理工大学工程力学系;
【基金】：国家自然科学基金项目(51541913,51279071) 云南农业大学自然科学青年基金项目(2015ZR17)
【分类号】：TV734.1

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