汽车下护板对发动机舱散热性能的影响

为提高汽车发动机舱的散热性能，通过计算流体力学数值仿真研究汽车下护板对整车散热性能的影响。研究表明：在高速工况下，增加下护板后格栅和冷却模块进气量增加；在高负荷工况下，下护板可改善发动机舱的空气温度分布形态。下护板开口可增加冷却模块进气量，不开口时舱内温度较低，所以在整车设计时应综合考虑散热量和热害。下护板能明显减少风阻，但开口会减弱其效果，因此设计时应多方面考虑。

Influence of bottom panel on engine cabin heat dissipation performance

In order to improve the heat dissipation performance of automobile engine cabin, the numerical simulation of computational fluid dynamics is conducted to study the effects of bottom panel on the cooling performance of the vehicle. The research shows that, under high speed conditions, the intake air volume of the grille and cooling module is increased after installing the bottom panel; under high load conditions, the bottom panel can improve the air temperature distribution pattern of the engine cabin. The opening of the bottom panel can increase the intake volume of the cooling module while the temperature in the engine compartment is lower without it. Therefore, the heat dissipation and heat damage should be comprehensively considered in the design of the entire vehicle. The bottom panel can also significantly reduce the wind resistance, but the opening can weaken the effect, so it should be considered from many aspects.In order to improve the heat dissipation performance of automobile engine cabin, the numerical simulation of computational fluid dynamics is conducted to study the effects of bottom panel on the cooling performance of the vehicle. The research shows that, under high speed conditions, the intake air volume of the grille and cooling module is increased after installing the bottom panel; under high load conditions, the bottom panel can improve the air temperature distribution pattern of the engine cabin. The opening of the bottom panel can increase the intake volume of the cooling module while the temperature in the engine compartment is lower without it. Therefore, the heat dissipation and heat damage should be comprehensively considered in the design of the entire vehicle. The bottom panel can also significantly reduce the wind resistance, but the opening can weaken the effect, so it should be considered from many aspects.