SAE方背飞行器模型尾流中的相干结构
Coherent structures in the wake of a SAE squareback vehicle model
摘要：
本文对SAE方背飞行器模型尾流进行了实验和数值研究，研究了雷诺数为$ Re_h = 1.0 \hspace{5pt} 10^6 $时尾流的相干结构。观察流场和底部压力场，以了解这些量的信号之间的关系。通过与Ahmed或类似车辆模型或三维非流线体的记录行为进行比较，进行了概括和区分。相比之下，旋涡脱落的作用类似，但仅限于SAE车辆模型尾流的上半部分。由于旋涡脱落的局部化和相位特性，底部压力信号与流场之间的联系很弱。然而，在某些条件下，例如在流量控制应用中，压力信号可以是可行的反馈传感器。近尾流的扑动被识别为低频时间尺度的波动。
英文摘要：
The wake of a SAE squareback vehicle model is studied both experimentally and numerically for a Reynolds-number of $ Re_h = 1.0 \hspace{5pt} 10^6 $.The investigation focuses on the coherent structures of the intermediate to largest length and time scales. Flow field as well as base pressure fields are observed for the understanding of the relation between the signals of these quantities. Generalizations and differentiations are made by comparison with the documented behavior of Ahmed or similar vehicle models or three-dimensional bluff bodies. In comparison the vortex shedding acts similar but is restricted to the upper half of the wake of the SAE vehicle model. Due to the localization and phase behavior of the vortex shedding the connection between the base pressure signals and the flow field is weak. However, the pressure signals may be a viable feedback sensor under certain conditions, for example in flow control applications. A flapping of the near wake is identified for the fluctuations of the low frequency time scales.
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