Flow around an articulated lorry model

Flow around an articulated lorry model
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绕铰接式卡车模型流动

DOI:
10.1016/j.expthermflusci.2016.11.003
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发表时间:
2017
影响因子:
3.2
通讯作者:
Lo K
Lo K
中科院分区:
工程技术2区
文献类型:
--
作者:
Lo K

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为了更好地理解牵引车-挂车的流动物理特性,在一个比例铰接车辆模型上进行了时间平均和瞬时流动模式的实验研究。研究采用全紊流,并采用烟雾可视化、表面油流可视化和双分量粒子图像测速进行流动诊断。时间平均流场和瞬时流场的结果显示,拖车模型后端下游尾迹区域的流型不同。在时间平均流场中,由于下切变层的盘绕,尾迹区出现一个单一的逆时针旋转涡。瞬时流型表明,在挂车模型下游的尾迹区存在两个尾迹涡。此外,尾流涡与上层切变层的相互作用导致切变层内流向涡的形成。这些顺流涡旋向下游生长并传播,导致拖车模型下游上部剪切层发生涡脱落。
An experimental study has been conducted to investigate both the time-averaged and instantaneous flow pattern over a scale articulated vehicle model for understanding the flow physics of tractor-trailer vehicles. Fully turbulent flow was used in the study and smoke visualisation, surface oil flow visualisation and two-component particle image velocimetry were employed for flow diagnostics. Results obtained from the time-averaged and instantaneous flow fields show different flow pattern in the wake region downstream of the rear end of the trailer model. In the time-averaged flow field, a single counter-clockwise rotating vortex is presented in the wake region due to the coil-up of the lower shear layer. The instantaneous flow pattern shows that two wake vortices are presented in the wake region downstream of the trailer model. Moreover, the interactions between the wake vortex and the upper shear layer lead to the formation of the streamwise vortices within the shear layer. These streamwise vortices grow and propagate downstream which lead to the occurrence of vortex shedding in the upper shear layer downstream of the trailer model.
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