脉动流通道内不同纵向涡发生器的颗粒污垢特性  

Particulate fouling characteristics of different longitudinal vortex generators in pulsating flow channel

作　　者：韩志敏[1] 李江 陈则齐 刘威 徐志明[1] HAN Zhimin;LI Jiang;CHEN Zeqi;LIU Wei;XU Zhiming(School of Energy and Power Engineering,Northeast Power University,Jilin 132012,Jilin,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012

出　　处：《化工学报》2024年第7期2486-2496,共11页CIESC Journal

基　　金：国家自然科学基金项目(52206079);吉林省教育厅项目(JJKH20240139KJ)。

摘　　要：换热器工作时介质中往往含有细小杂质粒子,容易沉积在通道中形成颗粒污垢。将传统脉动流与纵向涡发生器相结合,采用数值模拟方法对光滑通道、脉动流通道、纵向涡发生器通道以及脉动流结合纵向涡发生器通道的颗粒污垢特性进行对比分析,并且详细分析了脉动流结合纵向涡发生器通道中6种不同纵向涡发生器的影响。结果表明,相较于光滑通道,脉动流通道与纵向涡发生器通道的污垢热阻分别减小17%与22%,而脉动流结合纵向涡发生器通道能够减小45%,说明二者结合后的抑垢效果更好。对比脉动流结合6种不同纵向涡发生器发现相同类型下弯曲纵向涡发生器的抑垢效果优于未弯曲纵向涡发生器,通过与脉动流通道的污垢热阻渐近值对比发现抑垢效果由低到高为三角形12.8%、弯曲三角形14.7%、梯形22.0%、弯曲梯形23.8%、矩形29.4%、弯曲矩形33.0%,其中弯曲矩形纵向涡发生器的抑垢效果最好。When the heat exchanger is working,the medium often contains small impurity particles,which are easily deposited in the channels to form particulate fouling.This paper combines the traditional pulsating flow with the longitudinal vortex generator,and uses numerical simulation to compare and analyze the particulate fouling characteristics of the smooth channel,pulsating flow channel,longitudinal vortex generator channel and pulsating flow combined with longitudinal vortex generator channel,and analyzes the effect of the six different longitudinal vortex generators on the particulate deposition in the pulsating flow combined with longitudinal vortex generator channel in detail.The results show that compare with the fouling resistance of smooth channel,the fouling resistance of the pulsating flow channel and the longitudinal vortex generator channel are reduced by 17%and 22%,respectively,while the combination of the two can be reduced by 45%in the pulsating flow combined with longitudinal vortex generator channel,which indicates that the fouling suppression effect is better after the combination of the two.In addition,comparing the pulsating flow combined with six different longitudinal vortex generators,it is found that the curved longitudinal vortex generator has a better anti-fouling effect than the unbent longitudinal vortex generator of the same type.By comparing with the asymptotic value of the resistance of fouling in the pulsating flow channel,it is found that the anti-fouling effects from low to high are:triangle 12.8%,curved triangle 14.7%,trapezoid 22.0%,curved trapezoid 23.8%,rectangle 29.4%,and curved rectangle 33.0%,among which the curved rectangular longitudinal vortex generator has the best antifouling effect.

关 键 词：脉动流 纵向涡发生器 粒子 结垢 数值模拟 污垢热阻 

分 类 号：TK124[动力工程及工程热物理—工程热物理]