管道内喷雾蒸发冷却的数值模拟及优化设计  

Numerical simulation and optimization of spray evaporative cooling in air duct

作　　者：肖益民[1,2] 陶垚[1] 高阳华 

机构地区：[1]三峡库区生态环境教育部重点实验室(重庆大学),重庆400045 [2]重庆市气象科学研究所,重庆401147

出　　处：《哈尔滨工业大学学报》2015年第4期76-80,共5页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51178482);重庆市博士后科研项目特别资助(Xm20133);重庆市气象局开放式研究基金(kfjj-201202)

摘　　要：为研究雾滴粒径、喷头间距、风速和喷雾比等参数的改变对管内喷雾降温蒸发效率的影响,采用DPM模型方法对送风管道内喷雾直接蒸发冷却进行数值模拟和分析.通过单因素和多因素正交试验模拟,得到各参数最佳工况.模拟结果表明:粒径、风速和喷雾比越小时,蒸发效率越高;喷头间距的最佳值,应根据饱和水气比、空气流速、喷头的喷出速度和喷射角度确定.根据模拟结果,考虑系统经济性,对雾滴粒径小于30μm、风速1 m/s以下的工况,喷雾比下限为0.7,蒸发效率最高可达92%,饱和效率可达65%以上.In order to estimate the influence of particle diameter,nozzle spacing, wind speed and the sprayed ratio on the evaporating efficiency,numerical simulation of direct evaporative cooling of spray in the air ductwas processed using discrete phase model （ DPM ） . Through single factor analysis and multi-factors orthogonal method, the optimal operating conditionswereacquired. Simulation results showed that, the smaller diameter, wind speed and sprayed ratio generates higher evaporating efficiency. Anoptimum nozzle distance should be determined by saturated water-gas ratio, wind speed, injection velocity and injection angle. According to simulation results, considering the economyof the spray system, particlediameterunder 30 μm, wind speed under 1 m/s, sprayed ratio higher than 0-7, the evaporating efficiency could achieve 92%, with saturated efficiency higher than 65%.

关 键 词：管道喷雾 直接蒸发冷却 DPM模型 蒸发效率 

分 类 号：TU831[建筑科学—供热、供燃气、通风及空调工程]