插板阀启闭过程中气体介质流动特性的模拟试验  

Numerical simulation of the gas-solid flow around the valve of pneumatic conveying system

作　　者：陈丽华[1] 杨森[1] 邵雪明[1] 

机构地区：[1]浙江大学力学系,浙江杭州310027

出　　处：《阀门》2005年第2期11-14,40,共5页VALVE MAGAZINE

基　　金：浙江省自然科学基金资助项目 (10 10 47)。

摘　　要：对气力输送系统中出料阀附近三维管道中的气固两相流动进行了数值模拟,结果表明,在阀门开关的过程中,阀门附近管道的气流场比较复杂,在阀门后区域有明显的旋涡存在,在一些开度下甚至有二涡结构。在阀门开度较大的情况下,粒子对管壁的碰撞较少,随着阀门开度的减小,粒子与阀门和管壁之间的碰撞次数增多。不同粒径的粒子与阀门和管道的碰撞情况也不同,粒径为5 0 μm的粒子碰撞次数最少,而小于5 0 μm的粒子随着粒径减小碰撞次数增加,大于5 0 μm的粒子随着粒径增加碰撞次数增加。The numerical simulation was performed by the Euler-Largrange approach for the gas-solid flow field around the outlet valve of pneumatic conveying sys tem.This paper presented the research results.The gas-flow field was much more complicated around the valve while the valve was opening or closing,wake struct ure was observed obviously behind the valve,even two wake structure found for s ome opening extent.Moreover,the research discovered that the valve opening aff ect the collision frequency of particle with valve and wall,the frequency is hi gher when the opening decreased.Finally,the size of particle diameter had effe ct on the collision frequency,which is lowest when the size at 50 μm.

关 键 词：模拟试验 流动特性 气体介质 插板阀 启闭 气固两相流动 气力输送系统 阀门开度 数值模拟 三维管道 阀门开关 粒子碰撞 粒径 出料阀 气流场 涡结构 管壁 减小 

分 类 号：TQ051.13[化学工程] U467.13[机械工程—车辆工程]