汽车空调出风口气流均匀性对冷却性能的影响

摘要

CFD (computational fluid dynamics)method is applied to research the influence of air-flow uniformity over the duct outlet of vehicle air-condition on cooling performance.Considering the solar radiation and body heat dissipation,the cooling processes of two airflows with the same flux and different uniformity are simulated.The result shows that the airflow with higher uniformity is beneficial to cooling performance and thermal comfort by comparing the cooling time,flow field and temperature distribution.The reasons are also analyzed using the submerged turbulent jet theory.%采用计算流体力学（CFD）的方法，研究了汽车空调出风口处气流均匀性对冷却性能的影响及其原因。考虑了太阳辐射和人体散热对流场的影响，模拟了2种流量相同而均匀性不同的冷却气流对车室的降温过程。通过对比2种冷却气流的冷却时间、流场组织和温度分布情况，发现均匀性好的冷却气流对车室的冷却性能更好，而且更有利于改善人体热舒适性。结合淹没紊动射流理论，从流体力学的角度分析讨论了产生这种不同冷却效果的原因。