【摘要】 对客车空调回风系统进行了改进,首次提出将回风口由中间一个改为前后2个,并用k-ε两方程紊流模型和壁面函数法建立了相关的气流组织计算模型,对改进前后车内的温度分布情况作了数值模拟和分析比较.结果表明:改进后的回风系统使车内的气流组织以及温度分布情况得到明显改善,前后两端的温度显著下降(约降低2K),中部温度略有上升;在送风温度同为289 15K时,车内平均温度较改进前降低约0 5K,且乘客头部与足部区域之间的温差较改进前也有所降低.因此,对于改进前后同样的车内温度,改进后可以提高送风温度,从而降低系统能耗,还能够满足更大区域内乘客的舒适性要求.更多还原

【Abstract】 Two return air openings instead of one were adopted to improve the air distribution circulating system in the bus air conditioning device. The standard k-ε turbulence model and wall function were used in the investigation. Numerical simulations were performed comparatively for the situations with and without the improvement. The results demonstrate that the inside air temperatures tend to be more uniform after improvement of return air openings. The temperature in the front and rear of the bus drops obviously and that in the middle part rises slightly. The inside average temperature is more uniform and is 0.5 K lower at the same supply air temperature of 289.15 K. So the supply air temperature can be raised and the energy efficiency can be higher at the same inside temperature. Also, the temperature difference between the head and foot regions decreases, with 2 K drop at both ends, and a slight rise at mid part, which can offer better thermal comfort in much wider area. .更多还原