摘要
为研究固液两相流离心泵内部的非定常流动特性,基于滑移网格方法,采用RNGκ-ε湍流模型以及ASMM代数滑移混合物模型,对一台高比转速固液两相离心泵内部流场进行非定常流动的数值模拟,通过分析清水工况数值计算结果、外特性性能实验结果以及固液两相流非定常数值计算结果,获得了非定常条件下固液两相输送离心泵的瞬时外特性曲线和内部流动及磨损规律。研究结果表明:在一个转动周期内,离心泵的扬程、效率和轴功率均呈现正弦波动特征;动静干涉效应使得叶轮出口处的速度和静压分布均呈现周期性波动;模型泵叶轮前后盖板的磨损情况比蜗壳壁面的磨损严重。上述计算结果可为实现高比转速固液两相流离心泵的优化水力设计和减轻磨损提供一定的理论参考。
In order to study the unsteady flow characteristics of solid-liquid two-phase pump, sliding grid technique, the RNG κ-ε turbulence model and Algebraic slip mixture model were used to simulate the unsteady turbulent flow field in a high specific speed solidliquid two-phase centrifugal pump. The numerical calculation results and external characteristics results of single-phase water were compared. And the unsteady flow analysis was carried on for the solid-liquid two-phase mixture transportation. The results indicate that pump head, efficiency and shaft power show a sine wave features in a run cycle. The velocity and static pressure distributions at the outlet of impeller show cyclical fluctuations because of stator interaction effects. The wear of impeller is serious than that of the volute wall. In conclusion, these rules provide high specific speed solid-liquid two-phase centrifugal pump reference to achieve hydraulic design optimization and wear reduce.
出处
《机电工程》
CAS
2014年第6期702-706,共5页
Journal of Mechanical & Electrical Engineering
基金
国家自然科学基金资助项目(51076144)
国家科技支撑计划课题资助项目(2013BAF05B01)
关键词
固液两相流
非定常
流动特性
数值计算
磨损性能
solid-liquid two-phase flow
unsteady
flow characteristics
numerical simulation
wear property
