摘要
利用层流模型和欧拉模型,运用Phase Coupled SIMPLE(PC-SIMPLE)算法,对分离鳃与普通管中的水沙两相流流场进行了静水沉降的三维数值模拟,并根据数值计算结果,对分离鳃与普通管内的速度场和含沙量分布特性进行了对比与分析,探讨了分离鳃的水沙分离效率及机理。结果表明:分离鳃中的速度矢量分布规律与普通管不同;分离鳃的结构形式、其内部的流场特性及含沙量分布特性都有利于水沙的分离,故分离鳃中的泥沙速度、清水速度及泥沙去除率都大于普通管的。探明了分离鳃快速分离水沙的机理,这对分离鳃结构的进一步优化提供了理论基础。
Adopting laminar model and Eulerian multiphase flow model,three dimension numerical simulation of the two-phase flow field of water-sediment in gill-piece separation device and common tube are conducted by using phase coupled simple（PC-SIMPLE）algorithm.Based on the calculation results,the velocity field and the distribution characteristics of sediment concentration in gillpiece separation device and common tube are compared,and the water-sediment separation efficiency and mechanism are discussed.The results show that the velocity vectors distribution law in the gill-piece separation device is different from that in common tube;the structure type,the internal flow field characteristics and the sediment concentration distribution characteristics of gill-piece separation device are beneficial to the water-sediment separation.So the sediment velocity,the water velocity and the sediment removal rate in the gill-piece separation device is greater than those in the common tube.This paper has explored the mechanism of rapid water-sediment separation in gill-piece separation device.So it provides a theoretical basis for the further structure optimization.
出处
《节水灌溉》
北大核心
2015年第2期66-71,共6页
Water Saving Irrigation
基金
国家自然科学基金项目(50969009)
高等学校博士学科点专项(20070758003)
新疆水利水电工程重点学科基金(xjslgczdxk20101202)
关键词
数值模拟
欧拉模型
速度
含沙量
分离鳃
numerical simulation
Eulerian model
velocity
sediment concentration
gill-piece separation device
