由大尺度PTV测量确定全尺寸骑车人模型的气动阻力

2019/08/12   下载量： 1 次

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采用LaVison的DaVis8.4软件平台和三台CMOS相机(Photron FastCAM SA1, 1 MegaPixel, 构成一套时间分辨3D3C抖盒子测量系统，并利用该系统进行了由大尺度PTV测量确定全尺寸骑车人模型的气动阻力的研究。

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    The aerodynamic drag of a human-scale wind tunnel model is obtained from large-scale particle tracking velocimetry measurements invoking the conservation of momentum in a control volume surrounding the model. Lagrangian particle tracking is employed to obtain the velocity and static pressure statistics in a thin volume in the wake of a cyclist mannequin
at freestream velocities between 12.5 and 15 m/s, corresponding to Reynolds numbers from 5 × 105 to 6 × 105 based on the torso length. The spatial distributions of the time-average streamwise velocity and pressure coefficient match well with previous works reported in literature. The streamwise velocity fluctuations in the wake of the cyclist’s model are presented, clearly demonstrating the unsteady nature of the main wake flow structures. Furthermore, the obtained aerodynamic drag follows the expected quadratic increase with increasing freestream velocity. The accuracy of this drag estimation is evaluated by comparison to force balance data and corresponds to 30 drag counts. The three terms composing the overall drag force, ascribed to the mean and fluctuating streamwise velocity and the mean pressure, are also evaluated separately, demonstrating that the resistive force is dominated by the contribution of the mean streamwise momentum deficit, whereas the contribution of the pressure term is negligible.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
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北京欧兰科技发展有限公司
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