摘要
基于输运段对荷电颗粒凝并效率的影响,建立了荷电颗粒输运试验系统,以研究管内颗粒输运流场随电压的变化情况.利用网状目标法测定颗粒群平均荷电量,应用流场测量技术PIV系统研究外加电场对颗粒运动的作用,运用二值化互相关图像处理算法,获得输运断面上的荷电颗粒速度、涡量以及湍动能分布图.试验发现:当充电电压低于-10 kV时,颗粒的荷质比随充电电压的降低而增加,在-60 kV时基本达到饱和荷电量;输运段中颗粒速度、涡量的分布值随电压的降低而增加;湍动能的分布呈现单峰特性,在-50 kV时出现最大值.
Based on the convey flow field of charged particles determine the coagulation efficiency. The tentative system of charged coagulation is designed. The quantity of electricity of charged particles are investigated through experiment. And a flow field measurement technique PIV （Particle Image Velocimetry） system is adopted to study the additional electric field effect on particle flow. The experimental results shows that if charged voltage is under - 10 kV, the charge-to-mass ratio increases with decreasing charged voltage, reaches a saturation value at - 60 kV charged voltage. The velocity, vorticity of charged gas-solid flow increase with decreasing voltage, and turbulent kinetic energy reaches the maximum value at - 50 kV.
出处
《排灌机械》
2006年第3期31-34,共4页
Drainage and Irrigation Machinery
关键词
荷电
气固两相流动
输运
流场
PIV系统
charge
gas-solid two-phase flow
convey
flow field
PIV system
