基于分离涡模拟的核主泵水力性能非定常特性分析

为了研究核主泵在设计工况下水力性能的非定常变化特征,基于DDES湍流模型,对某型号核主泵进行全流场非定常数值计算,并结合Q准则捕捉的旋涡结构进行非定常特性分析.结果表明:在一个旋转周期内,受动静干涉作用,泵的瞬态外特性整体上具有不规律的周期性变化特征;叶轮与导叶流道内的旋涡结构会呈现出周期性分裂、融合的非定常现象,而压水室内旋涡结构则是发展与扩散的变化过程;导叶入口处不同时刻涡结构的变化会造成其不同程度的阻塞,从而引起出口压力的波动,造成泵的水力性能出现脉动效应,加剧泵的振动.

Unsteady analysis of hydraulic performance of reactor coolant pump based on detached eddy simulation

In order to study the unsteady characteristics of hydraulic performance of reactor coolant pump under design conditions, based on the DDES(delay detached eddy simulation) turbulence model, the unsteady flow field of a reactor coolant pump was calculated, and the vortex structure captured by Q criterion was analyzed. The results show that, in a rotating period, the transient external characteristics of the pump have irregular periodic characteristics under the action of static and dynamic interference. The vortex structure in the passage of impeller and guide vane presents the unsteady phenomenon of periodic splitting and fusion, while the vortex structure in the pressurized water chamber is the change process of development and diffusion. The change of the vortex structure at the inlet of the guide vane will cause different degrees of blockage, thus, the fluctuation of the outlet pressure causes the pulsation effect of the hydraulic performance of the pump and intensifies the vibration of the pump.