摘要
针对空气预热器中传热性能低下的问题,将纵向涡器运用于空气预热器热管内,以烟气为介质,运用计算软件FLUENT进行数值模拟,研究在不同Re数下,涡发生器对管内烟气的传热及流动阻力的影响,比较了不同攻角及翼高与管内半径之比的直角三角翼涡发生器强化换热效果,并与光管的换热系数和阻力系数进行了对比。分析表明,纵向涡发生器能明显提高换热性能,在所研究的纵向涡发生器中,攻角为45°时,涡发生器强化传热效果较好。随着Re数的改变,具有最佳传热效果的涡发生器结构也会有所不同。
Regarding the problem of the low efficiency in heat transfer of air Pre - heater. Longitudinal vortex generators were applied in the pipe of air pre - heater. By using the CFD software FLUENT and based on the exhaust gas, the study in the heat transfer and resistance performance of the different longitudinal vortex generators in different Reynolds number was carried out. The heat transfer coefficient and resistance coefficient were compared in normal tube and the tubes of longitudinal vortex generators with 3 important factors of the vortex generator： the winglet height, wing width and angle of attack. Several conclusions can be drawn： longitudinal vortex generators can enhance the heat transfer obvious. There is a better heat transfer performance when the attack angle is 45°, and along with reynolds number changed, the best heat transfer effect longitudinal vortex generators structure also change.
出处
《机械研究与应用》
2008年第6期18-20,23,共4页
Mechanical Research & Application
基金
湖南省科研项目(编号:2007GK3061)
关键词
纵向涡发生器
强化传热
数值模拟
longitudinal vortex generator
heat transfer enhancement
numerical simulation
