履带车辆动力舱空气流场的CFD模拟与试验研究

以某履带车辆动力舱为研究对象，建立了舱内空气流动与传热计算的物理模型和数学模型，采用标准k-ε方程湍流模型对动力舱内的空气流动进行了描述，采用Fluent软件中的薄面模型对散热器与冷却风扇进行了简化处理，对舱内空气的速度场和温度场进行了三维数值模拟，采用热线风速仪对进、排气窗处的气体流速与温度进行了试验测试，测试值与模拟值的最大相对误差为9．42％，精度能够满足工程需要，表明该计算模型合理可行。

Research on CFD Simulation and Test of Airflow Field in Engine Compartment of Tracked Vehicles

A tracked vehicle engine compartment is taken as the subject. The physical model and mathematical model for the computation of 3D airflow and heat transfer in the engine compartment of a tracked vehicle is established. Turbulent flow in the compartment is described by using the k-ε two-equation turbulence model. Radiators and cooling fans are considered to be infinitely thin and simulated by using the radiator model and fan model provided by Fluent. The temperature and velocity fields of 3D air flow in the engine compartment are numerically simulated. The velocity and temperature in the air inlet/outlet shutters of engine compartment are tested by using hot wire anemometry. The maximum relative error between test value and simulated value is 9.42% and the accuracy live up to the engineering requirements. The comparison results show that this computational model is feasible.