水轮机活动导叶匀速开关过程的三维湍流数值模拟
发布时间：2019-06-06 17:37
【摘要】：针对水力机械水力暂态过程中非定常流动的动边界问题,基于浸入边界法的建模思想,将刚体运动对流场的影响以附加体力的形式加入Navier-Stokes方程,建立了活动导叶连续运动和流体相互作用的数学模型.采用直接分步投影方法求解基于浸入边界法的耦合系统方程,其中固体边界离散点的作用力密度通过强制满足流固边界的无滑移条件导出,并通过δ光滑函数转换到流场的欧拉网格点上,实现对速度场的二次修正.通过数值模拟活动导叶连续运动下叶道内复杂湍流流动,获取活动导叶连续开、关过程中涡量等流动参量的时变特性和作用于转轮上的水力载荷特性.计算结果有助于水力机械暂态过程和机组稳定性控制策略的优化设计.
[Abstract]:Aiming at the dynamic boundary problem of unstable flow in hydraulic transient process of hydraulic machinery, based on the modeling idea of immersion boundary method, the influence of rigid body motion on flow field is added to Navier-Stokes equation in the form of additional physical force. The mathematical model of continuous motion and fluid interaction of moving guide vane is established. The direct step projection method is used to solve the coupled system equation based on the immersion boundary method, in which the force density of the discrete point of the solid boundary is derived by forcibly satisfying the non-slip condition of the fluid-solid boundary. The second correction of the velocity field is realized by converting the 未 smooth function to the Euler grid point of the flow field. By numerical simulation of the complex turbulent flow in the vane under the continuous motion of the movable guide vane, the time-varying characteristics of the flow parameters such as the continuous opening and closing of the movable guide vane and the hydraulic load characteristics acting on the runner are obtained. The calculation results are helpful to the optimal design of transient process and stability control strategy of hydraulic machinery.
【作者单位】： 昆明理工大学工程力学系;
【基金】：国家自然科学基金资助项目(11262008,51479085) 霍英东青年基金资助项目(141120)
【分类号】：TV136.1
[Abstract]:Aiming at the dynamic boundary problem of unstable flow in hydraulic transient process of hydraulic machinery, based on the modeling idea of immersion boundary method, the influence of rigid body motion on flow field is added to Navier-Stokes equation in the form of additional physical force. The mathematical model of continuous motion and fluid interaction of moving guide vane is established. The direct step projection method is used to solve the coupled system equation based on the immersion boundary method, in which the force density of the discrete point of the solid boundary is derived by forcibly satisfying the non-slip condition of the fluid-solid boundary. The second correction of the velocity field is realized by converting the 未 smooth function to the Euler grid point of the flow field. By numerical simulation of the complex turbulent flow in the vane under the continuous motion of the movable guide vane, the time-varying characteristics of the flow parameters such as the continuous opening and closing of the movable guide vane and the hydraulic load characteristics acting on the runner are obtained. The calculation results are helpful to the optimal design of transient process and stability control strategy of hydraulic machinery.
【作者单位】： 昆明理工大学工程力学系;
【基金】：国家自然科学基金资助项目(11262008,51479085) 霍英东青年基金资助项目(141120)
【分类号】：TV136.1
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