Abstract: On a new experimental set-up of filter with three ceramic filter elements, the transient velocity outside the filter element is measured by hot-wire anemometer during pulse-jet cleaning process. The influences of reservoir pressure and pulse duration on instantaneous velocity are investigated. The experimental results show that there exists a remarkable back-flow between the pulse-jet cleaning and normal filtration process. It is shown that the pulse-jet cleaning velocity and back-flow velocity increase with rising reservoir pressure. The back-flow velocity peak is several times of filtration velocity and makes fine particles redeposit on the filter element surface and even penetrate the filter element wall.

摘要： 在由 3根陶瓷滤管组成的实验装置上 ,利用热线风速仪对脉冲反吹时滤管外瞬态流场进行了测定 ,分析了喷吹压力和脉冲宽度对滤管外流场的影响。结果表明 ,滤管外流场存在严重的气体回流区 ,回流速度峰值数倍于正常过滤气速。随着离开滤管壁面距离的增加 ,喷吹速度和回流速度逐渐减小 .随着喷吹压力的增加 ,反吹速度和回流速度也显著增加 .