粉尘隔爆翻板阀功能实验与模拟研究

Functional Experiment and Simulation Study of Explosion Isolation Flap Valves

为探究粉尘隔爆翻板阀功能的影响因素及其作用机理,基于1 m 3爆炸测试系统,以玉米淀粉为介质,进行DN600隔爆翻板阀的功能实验研究,并利用Fluent软件建立二维同尺寸燃烧仿真模型,采用动网格技术6DOF求解翻板动态关闭过程,对隔爆阀安装在不同距离时的粉尘爆炸过程进行数值模拟.结果表明,模拟得到的压力发展、火焰传播及翻板关闭过程与实验一致;翻板关闭速度主要受粉尘爆炸压力上升速率影响,爆炸压力上升速率越大,关闭速度越快,并在翻板后方产生负压形成回流;且得到实验条件下隔爆翻板阀最小安装距离是其管径的6~7倍.

In order to study the influencing factors and mechanism of the function of dust explosion isolation flap valves,the corn starch isolation experiments were conducted based on the 1 m 3 standard explosion test system and the DN600 flap valve.In addition,the Fluent software was applied to simulate the isolation process of the flap valve at different installation distances.The two-dimensional corn starch dust explosion model was built and the dynamic process of flap closing was solved by the 6 DOF dynamic mesh model.The results show that the pressure development,flame propagation behaviors and flap closing process are consistent with the experiment.Furthermore,the flow velocity distribution in the flow field during the flap closing process is revealed,and the speed of the flap movement is affected significantly by the rising rate of dust explosion pressure.The increasing rate of explosion pressure rise often leads to the increasing closing speed.The backflow behind the valve forms due to the negative pressure,and the minimum installation distance of the DN600 flap valve should be 6 to 7 times of its pipe diameter.