【摘要】 基于Reynolds时均N-S方程,采用标准k-ε湍流模型,压力、速度耦合使用SIMPLEC算法,离散采用具有二阶精度的隐式格式差分,对轴流泵过流部件内部流场进行三维定常湍流数值模拟,得到泵内流动的速度和压力矢量分布图,以及其他一些流动的信息.数值模拟结果表明,设计工况下的流场分布和流态总体较好,但叶轮叶片背面进口靠近轮缘处出现局部低压,导叶外壁区域负荷大,说明该轴流泵水力模型还有进一步改进和对其性能进一步提高的必要.更多还原

【Abstract】 Based on the Reynolds time-averaged Navier-Stokes equations with turbulence mode,by using SIMPLEC algorithm to make pressure-velocity coupling,and by using the implicit different format with second-order accuracy,the stationary 3-D turbulent flow in axial-flow pump was numerically simulated and the velocity vectors,static pressure contours,and other flow informations were obtained.The simulation result showed that the flow field distribution and flow form were better in general in design condition,but a local low pressure area occurred at the inlet of impeller blade back near the wheel rim and the load on the outer wall of guide vane was large,indicating that it would be necessary to improve the axial-flow pump model and pump performance.更多还原