电传动装甲车动カ舱内空气波场数值模拟及结构改进分析

将装甲车由机械传动改为电传动后，电机类设备的增加对动力舱内的冷却系统提出新的要求，利用计算流体动力学(CFD)技术对虚拟动力舱内空气流场进行数值模拟，可以对动力舱冷却系统的合理性进行预测分析并提出建议。以某虚拟电传动装甲车动力舱为研究对象，建立了电传动装甲车动力舱内空气流动与传热计算的物理模型和数学模型，采用标准尾K-ε方程湍流模型对舱内的流动进行了描述，对不同风扇流量下动力舱内空气流场进行了三维数值模拟与分析，为风扇流量的确定提供了理论依据；对动力舱排气窗位置进行了分析讨论，指出排气窗位置的不同会对舱内部件带来不同的冷却效果。

Numerical Simulation of Airflow Field and Structure Improvement in Engine Compartment of Armored Vehicles with Electric Transmission

When the mechanical drive is changed into the electric transmission, the cooling system of the engine compartment should be altered to meet the new requirement for the increase in equipment such as electric apparatus. In order to predicte and analyze the rationality of cooling system in the vir?tual engine compartment, the numerical simulation of airflow fields in the engine compartment by us?ing computational fluid dynamics (CFD) technique is necessary. An armored vehicle with electric transmission was taken as the research object. The physical model and mathematical model for the computation of 3D air flow and heat transfer in the engine compartment of an armored vehicle with electric transmission was established. Turbulent flow in the compartment was described by using the standard k-￡ two-equation turbulence model. The temperature and velocity fields of 31J air flow in the engine compartment were numerically simulated and analyzed based on different fan’s flux. A theoret?ical basis for determination of the fan’s flux was given by the simulation results. The positions of the air-vent shutter were analyzed. The simulation results show that the different positions of the air-vent shutter can lead to different cooling efficiencies.