循环水泵流道的三维数值模拟与优化设计

通过建立基于RNG湍流模型的三维数值模型,对某循环水泵房前池和流道进行了数值模拟,重点对稳态及瞬态的水力特性进行了分析研究。结果表明:正常运行水位下,各工况的水泵喉部流速偏差均小于10%,能保证水泵安全稳定地运行。但在最低运行水位下,吸水池内涡量较大,为此提出了设置消涡胸墙的优化方案。两台水泵同时事故停泵时,会造成循环水泵房的暂时性溢流,可将泵房内人孔移至泵房外且运行水位降低0.30 m;两台水泵同时启动时,前池水位降低最大,但最小淹没深度仍能满足水泵的安全运行要求。

3D Numerical Simulation and Optimum Design of Circulating Water Pump Flow Channel in Thermal Plant

Based on RNG turbulent model,the 3D numerical simulation model of circulating water pump forebay and flow channel was established,which could simulate the hydraulic characteristics of the steady and transient flow.Under the goal level,the flow velocity deviation of pump throat is less than 10% at all operation situations,the pumps can work steadily.Under the lowest operation level,too much eddy is found from the calculated results,so the optimized scheme about setting parapet wall is approved.When two pumps stop simultaneously,temporary overflow will happen.To avoid overflow,manhole should be moved outside the pump house,and decrease the operation level of 0.30 meters.When the two pumps start up simultaneously,the water level in forebay will drop down highest,but the lowest submerged depth can still satisfy operation requirement.