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首页> 外文会议>Vehicle aerodynamics, 2012. >Experimental and Numerical Investigation of Wheel Housing Aerodynamics on Heavy Trucks
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Experimental and Numerical Investigation of Wheel Housing Aerodynamics on Heavy Trucks

机译：重型卡车轮罩空气动力学的实验和数值研究

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Wheel and underbody aerodynamics have become important topics in the search to reduce the aerodynamic drag of the heavy trucks. This study aims to investigate, experimentally as well as numerically, the local flow field around the wheels and in the wheel housing on a heavy truck; and how different approaches to modelling the wheel rotation in CFD influences the results. Emphasis is on effects due to ground simulation, and both moving ground and wheel rotation were requirements for this study. A l:4-scale model of part of a heavy truck geometry has been developed. During the model design numerical simulations were used to optimise the shape, in order to replicate the flow field near the wheel of a complete truck. This was done by changing the flow angles of the incoming and exiting flows, and by keeping the mass flow rates in to, and out of, the wheel housing at the same ratios as in a reference full size vehicle. To reduce blockage effects, the model was sectioned to reduce both height and width. In the experiments, pressure sensors and static pressure taps located in the wheel housing were utilised, and the simulations replicated the boundary conditions of the wind tunnel experiments, both in terms of the geometry of the model and wind tunnel as well as the modelling of the ground simulation. It was found that the wheel wake structures changed significantly when ground simulation was utilised. The main outflow through the wheel housing was influenced by the wheel rotation and took place further upstream, which resulted in large differences in the flow field downstream of the wheel. The influence of different strategies for modelling the wheel rotation in CFD was investigated and it was found that the Sliding Mesh approach was the most accurate method.
机译：为了减少重型卡车的空气阻力，车轮和车身的空气动力学已经成为重要的课题。这项研究旨在通过实验和数值研究重型卡车的车轮周围和车轮壳体中的局部流场。以及使用CFD对车轮旋转建模的不同方法如何影响结果。重点是地面模拟所带来的影响，移动地面和车轮旋转都是这项研究的要求。已经开发出重型卡车几何形状的1：4比例模型。在模型设计过程中，使用数值模拟来优化形状，以复制完整卡车车轮附近的流场。这是通过改变流入和流出流的流动角度，以及使进出车轮罩的质量流率保持与参考标准大型车辆相同的比率来完成的。为了减少阻塞效应，对模型进行了剖分以减小高度和宽度。在实验中，使用了位于轮壳中的压力传感器和静压抽头，并且模拟在模型和风洞的几何形状以及风洞的建模方面复制了风洞实验的边界条件。地面模拟。发现利用地面模拟时，车轮尾迹结构发生了显着变化。通过车轮外壳的主要流出量受车轮旋转的影响，并在更上游产生，这导致车轮下游的流场差异很大。研究了在CFD中建模车轮旋转的不同策略的影响，发现“滑动网格”方法是最准确的方法。

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