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首页> 外文会议>Vehicle aerodynamics, 2012. >Aerodynamic Investigation of Vehicle Cooling-Drag
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Aerodynamic Investigation of Vehicle Cooling-Drag

机译：车辆冷却阻力的空气动力学研究

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摘要

The interaction between cooling-air and external aerodynamics is known as interference. In a conventional car this interference under the hood results in additional drag. It is estimated that about 10% of the overall aerodynamic drag originates from the cooling air [1] depending on the car shape and cooling configuration. Obviously, cooling drag should be minimized for vehicles with low-drag aerodynamics. In this study cooling-air interference-effects are investigated through experimental, numerical and analytical methods with a focus on the surface pressure of the vehicle. The surface pressure of vehicles with and without interference effects is compared. Observations show that when the cooling-air inlet is opened a pressure rise occurs around the inlet, while a pressure drop appears around the outlet. This phenomenon was investigated for several vehicle shapes including a simplified bluff-body (SAE-Body) and a close-to-real quarter-scale model (aeromodel). Using this knowledge, a cooling duct with low cooling drag was investigated. It will be shown that the cooling drag decreases when the air is redirected appropriately, yet the pressure increase at the front of the vehicles cannot be avoided.
机译：冷却空气与外部空气动力学之间的相互作用称为干扰。在传统的汽车中，引擎盖下的这种干扰导致额外的阻力。据估计，总的空气阻力的大约10％来自于冷却空气[1]，具体取决于汽车的形状和冷却配置。显然，对于低阻力空气动力学的车辆，应将冷却阻力降至最低。在这项研究中，通过实验，数值和分析方法研究了冷却空气的干扰效应，重点是车辆的表面压力。比较了有无干扰影响的车辆的表面压力。观察结果表明，当打开冷却空气入口时，入口周围会出现压力升高，而出口周围会出现压降。对于几种车辆形状，包括简化的虚张声势车身（SAE-Body）和接近真实的四分之一比例模型（aeromodel），研究了这种现象。利用这一知识，研究了具有低冷却阻力的冷却管道。将显示出，当适当地重新引导空气时，冷却阻力减小，但是仍不能避免车辆前部的压力增加。

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