利用计算流体动力学软件Fluent，对汽车空调风道中的气流进行数值仿真，其结果与试验对比误差较小，并得出驾驶员侧出风口风量所占比例较小，从而致使驾驶员热舒适性较差。为改善这一现象，利用响应表面法，以空调风道中所加导流片的3个结构尺寸为设计变量，以驾驶员一侧的出风量比例和空调总出风量为优化目标对空调风道系统进行优化改进，并将改进后的空调系统应用于驾驶员热舒适性的分析。结果表明：改进后的汽车空调使驾驶员一侧的空调出风量比例由原来的44.9%提高至51.3%，驾驶员的热舒适性得到明显改善。

A numerical simulation on the air flow in vehicle air-conditioning duct is conducted by applying computational fluid dynamics（CFD）code Fluent and its result is compared to test result within a very small difference. Besides, the result shows that the distribution of air flow is so uneven that the thermal comfort of driver is rather poor. To improve it, the air-conditioning duct system is optimized by response surface methodology which took three structural dimensions of the deflector attached to it as design variables and considered the airflow ratio of the driver side and the overall airflow as optimized purposes, and then the thermal comfort analysis of the driver was performed to the improved air-conditioning system. As a result, the airflow ratio of the driver side is improved to 51.3% from 44.9% due to the optimized air-conditioning duct, as well as that the thermal comfort of the driver is obviously improved.

国家自然科学基金（50975083）；湖南省科技攻关计划重点项目（2009JT1014）；教育部长江学者与创新团队发展计划（531105050037）；湖南大学汽车车身先进设计制造国家重点实验室自主课题(61075001)