某自卸车动力舱热平衡联合仿真与优化

Co-simulation and optimization on thermal balance of engine compartment of a dump truck

用散热器风洞试验测量得到的试验数据作为三维和一维联合仿真边界条件,开展某自卸车动力舱热平衡的联合仿真分析,并通过整车道路试验验证了仿真结果的合理性。联合仿真结果表明:中冷器散热能够满足要求,而水箱散热能力不足,导风罩自身风阻较大。通过设计文丘里式导风罩、采用新型中冷器和水箱,在最大转矩点工况下,导风罩自身的风阻从原来的36 Pa减小到16 Pa,且风扇进口速度不均匀度由原来的169%降低到52.4%,风扇效率得到提升,中冷器和水箱的风量有所增大;中冷器出口温度与环境温度的温差降低0.8℃,水箱许用环境温度提高5.8℃:有效改善了自卸车的冷却性能。

The data obtained from radiator wind tunnel test served as the boundary conditions of three-dimensional and one-dimensional co-simulation, so as to carry out co-simulation and analysis on thermal balance of the engine compartment of a dump truck. And then, the simulation results were validated by vehicle road test. The cosimulation results showed： the cooling capacity of the air cooler met the requirements, while the cooling capacity of the water-cooling radiator was poor, and the resistance of the wind shield was great. After applying Venturi wind shield, new-type air cooler and water-cooling radiator, in the maximum torque point operation mode, the resistance of the wind shield reduced from 36 Pa to 16 Pa, the uniformity of the outlet velocity of the fan decreased from 169% to 52.4%, thus the fan efficiency enhanced, as well as the air flow of the air cooler and the water-cooling radiator increased; the difference between the outlet temperature of the air cooler and the ambient temperature decreased by 0.8 ℃, and the permissible ambient temperature of the water-cooling radiator increased by 5.8 ℃. Thus, the cooling performance of the dump truck effectively improved.