摘要
基于FLUENT数值模拟软件,利用有限体积法对雷诺时均Navier-Stokes方程进行离散,选用标准k-ε湍流模型,压力和速度耦合采用SIMPLEC算法,对3种不同粘度流体在5种不同工况下分别进行数值计算,由数值计算结果分析得出离心泵内部三维流场随流体介质粘度的变化而变化的规律.同时,将3种情况下的预测扬程和效率进行对比分析,得出不同粘度流体对离心泵外特性的影响情况.相同流量下,随粘度增大,扬程降低.在设计工况点附近,效率随粘度变化相差不大,但在远离设计工况点时,随粘度变化的效率差别比较大.由模拟结果可知:采用不同粘度的介质时,离心泵内部压力和速度分布与采用清水介质得到的规律是基本一致的.
To learn about the flow behavior of centrifugal pumps handling different fluids under different operating conditions, numerical simulations were conducted by FLUENT, in which Reynolds averaged Navier- Stokes equations are diseretized by finite volume method, and the pressure-velocity relation is coupled by SIMPLEC algorithm. According to the comparison and analysis of the simulated results, it was found that different viscosities have much influence on the performance of centrifugal pump. At the same flow rates, the head decreases with the viscosity increasing. The efficiency changes little near the design point, while changes great when far away from the design points. The simulation results show that the internal pressure and velocity distribution with different viscosities are almost similar with that of water.
出处
《排灌机械》
EI
2009年第3期168-172,共5页
Drainage and Irrigation Machinery
基金
江苏省高校自然科学基础研究项目(08KJB570001)
关键词
离心泵
粘度
数值预测
三维流场
水力性能
centrifugal pump
viscosity
numerical simulation
3 - dimensional flow field
performance characteristics
