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Characterisation of the flow past real road vehicles with blunt afterbodies

机译：经过钝器的真实道路车辆的流量表征

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摘要

The flows past two different road vehicles with blunt after-bodies are studied at Reynolds numbers 107. The boundary layer thickness and the pressure distribution around the body are characterised. Then, the wake is investigated through static pressure and velocity measurements. Similar properties are obtained for both vehicles; in particular the lowest pressure on the afterbody is reported on the lower part of the base. Hot-wire anemometry is also used to depict the dynamics of the flow. The detached shear from the roof behaves as free shear turbulent flows whereas the flow from the underbody rather corresponds to homogeneous shear turbulent flows. In addition, global mode dynamics is reported in the wake of one vehicle and is associated with an antisymmetric coupling of the lateral mixing layers. However, the intensity of this mode is limited and its maximum of amplitude is downstream of the recirculation bubble; therefore it may not be a contributor to the drag. Eventually, these results are analysed to orient future drag reduction control strategies.
机译：雷诺数为107时，研究了流经后钝体的两种不同道路车辆的流动。表征了边界层的厚度和车身周围的压力分布。然后，通过静压力和速度测量研究尾流。两种车辆都具有相似的特性。特别是在底座下部报告了后座上的最低压力。热线风速仪也用于描述流动的动力学。从车顶上脱离的剪力表现为自由剪力湍流，而来自车身底部的流则对应于均匀的剪力湍流。另外，据报道，在一辆车辆的尾随时，全局模式动力学与横向混合层的反对称耦合有关。但是，这种模式的强度是有限的，并且其最大振幅在再循环气泡的下游。因此，它可能不是造成拖累的原因。最终，将对这些结果进行分析，以定位未来的减阻控制策略。

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