坦克液力机械传动装置热分析

综合考虑液力机械传动装置中各系统间相互作用以及润滑油,动力舱空气和车体对传热的影响,建立了坦克液力机械传动装置的整体热分析模型。模型由传动箱、液力变矩器、变速器、侧减速器的产热模型和热网络传热模型组成。对坦克机械传动工况和液力传动工况进行了热分析,得到了传动装置产热量、传热量和部件温度的详细分布。给出了温度分析值与试验值的对比。结果表明,热分析温度值与实车行驶测试值对比最大相对误差小于10%.     

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 increasing in equipment such as electric apparatus.In order to predict and analyze the rationality of cooling system in the virtual engine compartment,the numerical simulation of airflow fields in the engine compartment by using computational fluid dynamics（CFD） technique is necessary.An armored vehicle with electric transmission in the research is 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 is established.Turbulent flow in the compartment is described by using the standard k-ε two-equation turbulence model.The temperature and velocity fields of 3D air flow in the engine compartment are numerically simulated and analyzed based on different fan＇s flux.A theoretical basis for determination of the fan＇s flux is given by the simulation results.The positions of the air-vent shutter are analyzed.The simulation results show that the different positions of the air-vent shutter can lead to different cooling efficiencies.