湍流边界层中的大尺度体积流场测量

2019/08/12   下载量: 2

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应用领域 航空航天
检测样本 航空
检测项目
参考标准 暂无

采用两组每组8台相机(LaVision Imager Pro HS) 构成一套组合的3D3C体视抖盒子测量系统。每组相机系统可以获得90 × 60 × 25 cm3大小的体视流场,两套系统测量对象空间有30cm重叠,最终实现150 × 60 × 25 cm3尺度的流场测量结果。并将之应用于湍流边界层。

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   The aim of this work is to capture the spatiotemporal dynamics of large-scale flow structures in a turbulent boundary layer flow in a volumetric and time-resolved way. The applied means are dense Lagrangian Particle Tracking of Helium-Filled Soap Bubbles (HFSBs) using the Shake-The-Box (STB) algorithm and a subsequent interpolation to a regular grid using the physically regularized FlowFit method. The presented experiment was performed as a pre-test to a full campaign to be held in August 2018 at the Atmospheric wind tunnel at the University of the armed forces in Munich, Germany. This test demonstrates
the principle applicability of the measurement techniques to a low-speed wind tunnel environment and shows that high spatial accuracy and resolution can be reached despite of a large measurement volume. Problems were encountered achieving a homogeneous bubble distribution and in deploying large amounts of bubbles, while not disturbing the flow.

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