流体动压型核主泵机械密封腔内流动与传热研究

Study on Fluid Flow and Heat Transfer in Seal Chamber of Hydrodynamic Mechanical Seals in Reactor Coolant Pump

为研究某型号流体动压型核主泵机械密封流场和温度场的分布规律,使用Pro/E软件建立了机械密封环及密封腔的三维实体模型。采用k-ε湍流模型,基于ANSYS Fluent软件求解了纳维-斯托克斯(N-S)方程和能量方程。研究了密封环生热与密封腔散热的规律。分析了流体流动与温度变化趋势。结果表明:该型核主泵机械密封的压力以密封端面为界,分为高压区和低压区。在密封端面液膜压力由外径到内径逐渐降低。最高温度出现在密封端面处,由密封端面向外温度逐渐降低。液膜粘性剪切热通过密封环的热传导及腔内流体的对流换热作用而带走。机械密封的泵送环强化了端面热量的散失。

To study the distribution of the flow and temperature field in a type of hydrodynamic mechanical seal of a nuclear reactor coolant pump,a three-dimensional model of the mechanical seal and the seal chamber is established based on the software Pro/E.The N-S equations and energy equation coupling with the k-εturbulence model are solved based on ANSYS Fluent.The heat generation between the mechanical seal rings and the heat transfer distribution in the sealing chamber is studied.The fluid flow and temperature field of the mechanical seals is analyzed.The results show that the pressure distribution of the mechanical seals is divided into the high-pressure zone and the low-pressure zone by the sealing end face.The liquid film pressure in the mechanical seal end faces gradually decreases from the outer radius to the inner radius.The highest temperature appears at the sealing face,and the temperature decreases gradually away from the sealing face.The viscous heat in the liquid film is transferred away through the seal rings and the heat convection of the fluid flow in the sealing chamber.The pumping ring of the mechanical seal strengths the heat convection of the end faces.