空调列车软卧包厢内置换通风热环境数值模拟

采用Airpak软件对置换通风下的空调列车软卧包厢内热环境进行三维数值模拟,得到包厢内流场、温度场、PMV-PPD和空气龄分布.根据人体舒适性指标(PMV-PPD)和衡量空气品质的空气龄值,对包厢内气流组织和空气品质进行了预测和评价.研究表明:采用Airpak软件,并基于PMV-PPD和空气龄的热环境数值预测和评价,具有全面、系统、直观的优点,为优化空调列车舒适环境和列车空调系统设计提供参考.

Numerical simulation on thermal environment of air- conditioned soft- sleeper chamber with displacement ventilation

The thermal environment of air-conditioned train’s sleeper chamber with displacement ventilation was simulated in three-dimension by Airpak software,and the distribution of velocity fields,temperature fields,PMV-PPD and air age was obtained.The air distribution and air quality was predicted and evaluated based on human thermal comfort index of PMV-PPD and air quality index of air age.The results show that the numerical prediction and evaluation of thermal environment has the overall,system and intuitive advantages by Airpak software and based on the PMV-PPD and the air age,it provides the reference for optimizing the comfortable environment of air-conditioned train and designing the air conditioning system of train.