A Hot-wire anemometry experiment is conducted to investigate how two turbulent fields decaying with different mean velocities interact at their interface. A grid with different mesh sizes and solidities on either side of the grid centerline is used to generate two turbulent fields. It is found that the resulting turbulent shear layer created at the interface of the two fields evolves in a self-preserving manner. Further, the Taylor microscale Reynolds number, $R{e}_{\lambda }$ increases linearly while $\overline{u^2}$ and $\overline{q^2}$ become constants as the distance x downstream of the grids increases. Off the centerline one observes the classical decay of turbulence, e.g. $\overline{u^2}$ varies like $x^n$ (n is negative) and $R{e}_{\lambda }$ decreases. It is observed that the transport equation for $\overline{u^2}$ is dominated by the production and pressure-velocity correlation in the central region of the turbulent shear layer while production, dissipation, and turbulent diffusion of the transport equation for $\overline{q^2}$ dominate in the central part of the shear layer. The pressure-velocity correlation term for $\overline{q^2}$ is negligible on the centreline of the shear layer and important on the edges. The measurements of the scale-by-scale (SBS) energy terms on the shear layer centerline reveal that the energy transfer from large to small scales occurs in a non-trivial manner.

进行了热线风速测定实验，以研究两个以不同平均速度衰减的湍流场如何在其界面处相互作用。网格中心线两侧具有不同网格大小和坚固性的网格用于生成两个湍流场。结果发现，在两个场的界面处产生的湍流剪切层以自我保护的方式演变。此外，泰勒微尺度雷诺数，$R{\mathrm{电子}}_{\lambda }$线性增加，而$\overline{{你}^{\mathrm{2个}}}$和$\overline{q^{\mathrm{2个}}}$随着网格下游距离x的增加，变得恒定。在中心线之外，人们观察到湍流的经典衰减，例如$\overline{{你}^{\mathrm{2个}}}$变化如$X^n$（n为负）和$R{\mathrm{电子}}_{\lambda }$减少。据观察，输运方程为$\overline{{你}^{\mathrm{2个}}}$由湍流剪切层中心区域的生产和压力 - 速度相关性决定，而传输方程的生产，耗散和湍流扩散$\overline{q^{\mathrm{2个}}}$在剪切层的中心部分占主导地位。压力速度相关项为$\overline{q^{\mathrm{2个}}}$在剪切层的中心线上可以忽略不计，而在边缘很重要。剪切层中心线上逐尺度 (SBS) 能量项的测量表明，从大尺度到小尺度的能量转移以非平凡的方式发生。