失水事故工况下主泵全特性数值分析

Numerical Analysis on Complete Characteristics of LOCA Reactor Coolant Pump

为研究核反应堆主冷却剂泵在失水事故工况下的全特性,通过三维软件Pro/E对核主泵内部流道进行三维造型,利用雷诺时均N-S方程和RNG k-ε两方程及SIMPLEC算法,应用计算流体力学软件(CFX)对核主泵全特性进行数值模拟计算,分析核反应堆主冷却剂泵的全特性曲线,并解释小流量出现驼峰现象的原因。结果表明:叶轮所受的扭矩主要来自于叶片所受的扭矩,前后盖板所受的扭矩对叶轮的影响很小。叶片所受的扭矩和轴向力的变化趋势和流量-扬程曲线变化规律有一定的相似性,三者之间可能有密切关系。

For the study on complete characteristics of LOCA reactor coolant pump, three-dimensional modeling for the pump internal flow channel by pro/E, based on the Reynolds-averaged Navier-Stokes equations with the RNG k-e turbulence model and SIMPLEC algorithm, using the computational fluid dynamics sottware CFX to conducts the numerical simulation calculation for complete characteristics of reactor coolant pump, complete characteristic curves have been analyzed, and reasons of the hump phenomenon in small flow conditions are explained. The result shows that： numerical simulation method is feasible to calculate complete characteristics of reactor coolant pump. The impeller torque is mainly from the blade, and the torque of the front and rear shroud has little effect on the impeller torque. The torque and axial force of blade have similarity trend with Q-H curve, and they are closely related.