内管行星运动环空中幂律流体流动的数值模拟

Numerical Simulation for the Power-Law Fluid Flows in Annulus with Planetary Motion of the Inner Tube

运用函数UDF和动网格技术,对内管行星运动的偏心环空中幂律流体流动进行数值模拟,计算分析了自转与公转参数对流场速度分布、二次流、杆柱扭矩以及流体轴向压降的影响。计算结果表明:流动时的雷诺数Re=24.083~828.75;内管的公转使偏心环空流场速度核心区绕内管轴线向公转反方向偏移;内管自转与公转方向相反时,环空内二次流现象显著;内管自转且公转时,杆柱扭矩以及环空内流体轴向压降均比内管仅自转时大。

The UDF program which achieved planetary motion of inner rod is compiled and numerical simulation for power-law fluid flow in eccentric annulus is achieved with application of dynamic mesh. Influence on velocity distribution, secondary flow, moment of inner tube and pressure drop by rotation parameters of inner tube was calculated. The results show: Reynolds number Re=24.083~828.75; revolution of the inner tube make the speed core area of fluid in eccentric annulus rotate around the opposite direction of revolution. When the direction of rotation and revolution is opposite, the secondary flow is obvious. The moment of inner tube and pressure drop of fluid in eccentric annulus increase when considering revolution and rotation of the rod