论文标题
SAE Squareback车辆型号之后的连贯结构
Coherent structures in the wake of a SAE squareback vehicle model
论文作者
论文摘要
对于$ re_h = 1.0 \ hspace {5pt} 10^6 $的雷诺数，对SAE Squareback车辆模型的唤醒进行了研究。调查侧重于中间的相干结构至最大的长度和时间尺度。观察到流场以及基本压力场，以理解这些数量的信号之间的关系。通过与艾哈迈德或类似车辆模型或三维虚张声势体的文献行为进行比较，进行了概括和区分。相比之下，涡流脱落的作用相似，但仅限于SAE车辆模型的上半部分。由于涡流的定位和相位行为，脱离了基本压力信号与流场之间的连接较弱。但是，在某些条件下，例如在流量控制应用中，压力信号可能是可行的反馈传感器。对于低频时间尺度的波动，确定了近唤醒的拍打。
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.
