摘要
为分析电除尘器(ESP)通道中的耦合流动对于荷电粒子捕集的影响,考虑空间电荷密度的作用,模拟了波形板和C型板通道中电风诱导的二次流与主流的耦合效应。基于FLUENT的用户自定义(UDF),采用有限体积法计算电流场并与FLUENT流场耦合,数值模拟了2种实际板型廓线下线-板式电除尘器中的电流体动力学(EHD)流动。模拟结果表明:这2种通道中的电气特性和电流体动力学流动特征有明显差别;波形板通道收尘极表面附近区域的电场强度及分布均优于C型板,即前者近板电场强度相对高且分布更均匀;C型板通道中电风引起的二次流动则强于波形板;当主流速度增大时,波形板通道中的电风效应将逐渐消失,而在C型板中的电风将会加强主流速度,收尘极板附近的涡流区沿流动方向将逐渐变弱。最终得出波形板相对C型板能更有效地抑制粒子返混。
In order to analyze the influence of the coupling flow in the electrostatic precipitator （ESP） channel on the charged particle trapping, we analyzed the momentum coupling between ionic wind induced secondary flow and the mean flow with the consideration of space charge density distributions.Moreover, taking the zigzag plate and C-type plate as collecting plates, we simulated the electrohydrodynamic（EHD） flows in wire-plate electrostatic precipitator by employing finite volume method with the aid of user defined function （UDF） of FLUENT for two real geometrical configurations. The results show that the electrical performances and the features of the electrohydrodynamic flow are different in the two configurations; The near-plate electric intensity and its distribution in the zigzag one are better than those in the C-type, i.e., in the vicinity of the collecting plate, the averaged field strength is higher and the field distribution is more uniform for the former, and the ionic wind induced flow is stronger in the C-type ESP than that in the zigzag type; When the mean flow velocity is increased, the ionic wind effect disappears in the zigzag channel, while in the C-type, the ionic wind will enhance the main flow, and the near-plate local vortexes become weak in the stream-wise direction. The conclusion is that the zigzag type plate effectively refrain the escape of the particles better than the C-type plate.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第2期541-546,共6页
High Voltage Engineering
基金
国家自然科学基金(51578121)~~
