汽车前端冷凝器进风不均匀性分析

针对汽车实际行驶过程中前端冷凝器进风不均匀的问题，采用计算流体力学（Computational Fluid Dynamics，CFD）对不同车速下的冷凝器整个进风表面进行数值计算并分析速度变化规律；根据冷凝器结构特点重新分区进行计算，得到更直观的速度分布.结果表明：汽车冷凝器前端进风不均匀程度随着车速的增加而增大；当车速低于50 km/h且风机开启时，最大风速主要集中在冷凝器中间部分；当车速高于50 km/h且风机关闭时，最大风速主要集中在冷凝器的下半部分.

Analysis on non-uniformity of airflow of automobile front end condenser

As to the issue of non uniformity of front end condenser airflow during the actual automobile driving, the Computational Fluid Dynamics (CFD) method is applied on condenser airflow distribution analysis. As to the condenser under different automobile speed, the inlet surface is numerically calculated and the inlet airflow velocity change rule is analyzed; the condenser is divided into several zones according to its structure characteristics and re calculated to obtain more intuitive velocity distribution. The result shows that, the non uniformity of automobile front end condenser airflow increases with the increase of automobile velocity; the maximum airflow velocity concentrates in the central part of the condenser when the automobile velocity is lower than 50 km/h and the fan is on; the maximum airflow velocity concentrates in the lower part of the condenser when the automobile velocity is higher than 50 km/h and the fan is off.