An experimental campaign on a bluff body of rectangular cross section, having a side-length ratio of 5:1 was carried out using both particle image velocimetry and hot wire anemometry at a Reynolds number of $3.04\times {10}^4$. Results show that under a slight angle of attack, the development of unsteadiness in the form of turbulent kinetic energy is significantly amplified on the pressure side of the body. A series of linear corrections fail to fully collapse the behavior of the curved shear onto the growth rates of the canonical planar mixing layer solution as expected. In pursuit of providing a physical mechanism to a non-linear contribution to shear layer transition, inspection of relevant components of the Kármán-Howarth-Monin-Hill equation suggest a re-orientation of energy in scale-space, resulting in a combined forward and reverse energy transfer. It is shown that this reorganization process and energy transfer depend on the orientation of energetic structures within the shear layer.

边长比为5：1的矩形横截面钝体上的实验活动是使用粒子图像测速法和热线风速法在雷诺数为1时进行的 $3.04\times {10}^4$。结果表明，在较小的迎角下，湍流动能形式的不稳定状态在身体的压力侧显着放大。一系列的线性校正无法按预期将弯曲剪切的行为完全破坏到规范平面混合层解决方案的增长率上。为了提供对剪切层过渡的非线性贡献的物理机制，对Kármán-Howarth-Monin-Hill方程相关组件的检查表明，能量在尺度空间中重新定向，导致正向和反向结合反向能量转移。结果表明，这种重组过程和能量转移取决于剪切层内高能结构的取向。