细水雾室外环境降温效果的数值模拟  

Numerical simulation of cooling effect by fine water mist in outdoor environment

作　　者：王军锋[1] 屠欣丞[1] 黄继伟[1] 黄俏梅[1] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2009年第6期591-595,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省自然科学基金资助项目(BK2008229);江苏省镇江市产学研合作项目(2007)

摘　　要：利用CFD软件Fluent的Realizable k-ε模型和离散相模型对不同液滴粒径的细水雾室外环境降温效果进行数值模拟,模拟了夏季室外大空间环境中的细水雾弥散输运过程和传热传质特性,获得细水雾气液两相流动的流场、温度场和湿度场的分布情况,并对某工况的降温效果进行人体舒适度指数预报.模拟结果表明,小粒径液滴主要在射流的起始段和过渡段中蒸发,大粒径液滴在射流的核心区与回流区中蒸发;增大液滴直径后,细水雾的蒸发时间延长,细水雾降温效果增强,降温影响空间扩大.不同身高的人群均可以感觉到明显的降温作用;增大液滴直径后,细水雾增湿范围扩大,增湿幅度基本不变,不会造成局部环境相对湿度的明显增加;细水雾室外环境降温可以有效降低人体舒适度指数,有效改善室外环境质量.Numerical simulation on cooling effect by fine water mist in outdoor environment was carried out under real physical condition and the Realizable k-ε model. Discrete particle model in Fluent was used to simulate the status of fine water mist transportation and the characteristics of heat and mass transfer in outdoor environment. The flow,temperature and humidity fields were simulated. In addition,the human comfort index of cooling effect was predicted. The simulation results show that the evaporation of small size droplets takes place in the zone of flow establishment and transition,and the evaporation of large size droplets occurs in the back flow zone. With the increasing of droplets diameter,the evaporation time of droplets prolongs,cooling effect is more evident and cooling space is expanded. With the increa-sing of droplets diameter,the extent of humidifier expands,the range of humidifier keeps constant,and the relative humidity in local environment increases very little.The technology of fine water mist cooling in outdoor environment will reduce the human comfort index and improve the quality in outdoor environment effectively.

关 键 词：细水雾 发室外环境 降温效果 数值模拟 

分 类 号：TK7[动力工程及工程热物理—流体机械及工程]