汽车空调鼓风机进风口参数数值研究

Numerical Investigation of the Parameters of Blower Intake Opening of Automotive Air-Conditioning

基于计算流体力学(CFD)方法,采用RNGk-ε模型,建立了某轿车空调鼓风机进风口的数值模型,并对影响鼓风机进风口气流组织及风阻特性的参数(进风罩形状、进风口开口面积及外部障碍物与进风口距离)进行了数值研究.结果表明:数值分析结果与试验结果吻合较好,风阻的最大偏差小于5%;进风风罩形状对进风气流组织及风阻特性基本无影响;当鼓风机罩壳进风面积约等于1.5倍的出风面积时,鼓风机的运行效率最为经济;外部障碍物的存在对鼓风机进风风阻影响较大;综合考虑以上影响因素,得到鼓风机进风口开口面积的经验公式.

Based on the method of computational fluid dynamics （CFD）, the three-dimensional CFD model of an automotive air-conditioning blower intake was established by using RNG k-ε model. The effect of the design parameters, such as the opening area and the shape of blower intake and the distance between barrier and intake opening, which will had significant effects to air organization and air flow resistance, were numerically investigated. The results indicate that the CFD results fit experimental data satisfactorily from the literature with the max difference of 5%, and different shapes of blower intake have the almost same effects to air organization and airflow resistance, and the blower operates in the most economical co- efficient of performance when opening area of blower intake is one and half large as that of blower intake outlet. In order to reduce the airflow resistance, the distance between barrier and intake opening should have the minimum limit. In addition, by comprehensive consideration of these factors above, the empirical formulation of opening area of blower intake is given.