核主泵流体静压机械密封端面流场性能分析

Study on Face Flow Field performance of Hydrostatic Pressure Mechanical Seal in Nuclear Power Pump

根据流体力学基本原理,考虑密封环的运动,建立静压机械密封端面流场的Reynolds方程,分析流场流动类型,建立液膜径向压力、液膜刚度、阻尼的表达式,分析结构参数对液膜压力、液膜刚度和阻尼的影响,利用最小二乘法得到稳定状态下液膜压力沿径向的分布曲线。通过MATLAB编程计算得到液膜刚度和阻尼随端面锥角和转折半径的变化曲线。结果表明：刚度随着转折半径的增大而减小,随着端面锥角的增大而减小;阻尼随着转折半径的增大而增大,随着端面锥角的增大而减小。端面锥角值应该在2’附近取值,转折半径应在130~140 mm之间取值。

Based on the principle of fluid mechanics,considering the motion of sealing rings,the Reynolds equation for hydrostatic pressure mechanical seal in nuclear power pump was established,flow type of flow field was analyzed,the analytic expressions for radial pressure of liquid film,liquid film stiffness and damping were established.The influence of structural parameters on film pressure,stiffness and damping were analyzed.The distribution curve of film pressure in radial direction was got by Least Squares Method.By MATLAB programming,the distribution curves of film stiffness and damping changing with face coned angle and turning radius were obtained.Analysis results show that the stiffness is reduced along with the increasing of turning radius and face coned angle,the damping is increased along with the increasing of turning radius,and reduced along with the increasing of face coned angle.Face coned angle should get its value close to the 2’,turning radius should get its value between 130 mm to 140 mm.