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Aerodynamic characterisation of a square back bluff body flow

机译:方形后挡板流体流的气动特性

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This article deals with the flow characterisation around a square back Ahmed body. Results of time-averaged and instantaneous flow characteristics are compared to the literature. All the results presented in this article were obtained when the Reynolds number independency of the drag coefficient was reached. The first part of the study focuses on time-averaged results. The turbulent boundary layer on the roof of the model has been characterised and mean flow topology is investigated thanks to particle imaging velocimetry and pressure measurements. The second part of the paper is dedicated to the characterisation of the vortex shedding in the wake using hot wire anemometry. The phase difference of vortex shedding between two edges, the vortex pairing in the shear layers and the pumping effect are tackled.
机译:本文讨论了方形后卫艾哈迈德身体周围的流动特性。将时间平均和瞬时流量特性的结果与文献进行比较。当达到阻力系数的雷诺数独立性时,可获得本文提供的所有结果。研究的第一部分集中于时间平均结果。对模型顶部的湍流边界层进行了表征,并借助粒子成像测速和压力测量研究了平均流拓扑。本文的第二部分致力于使用热线风速仪表征尾流中的涡旋脱落。解决了两个边缘之间涡流脱落的相位差,剪切层中的涡流对以及泵浦效应。

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