Reynolds Number Effects on Boundary Layer Turbulent Transport

本项目的目的是确定雷诺数在湍流边界层结构中的作用。传输方程中重要项的测量将在表层湍流和环境科学(SLTEST)设施中进行，雷诺数从103到106。SLTEST设施利用流经犹他州西部大盐湖沙漠上空的大气表层。探测器将提供描述轴向应力传输和浓度变化的方程中各个项的空间和时间分辨测量结果。还将对速度-涡度相关性进行测量。由两个光电离化传感器和四根热线组成的标量输运探测器将用于获得与标量方差输运方程有关的数据。SLTEST设施将产生低速、大长度的边界层。这些设施的重要性在于，它们允许进行高分辨率的空间和时间测量。在气动飞行器减阻等工程应用中，对输运机理的基本了解在设计中可能是有用的。

The objective of this project is to determine the role of Reynolds number in the structure of the turbulent boundary layer. Measurements of important terms in transport equations will be made at the Surface Layer Turbulence and Environmental Science (SLTEST) facility at Reynolds numbers ranging from 103 to 106. The SLTEST facility makes use of the atmospheric surface layer that flows over the Great Salt Lake Desert in western Utah. Probes will provide spatially and temporally resolved measurements of the individual terms in the equations describing the transport of axial stress and concentration variance. Measurements will also be made of the velocity-vorticity correlations. A scalar transport probe, consisting of two photo-ionization sensors and four hot-wires, will be used to obtain data relating to the scalar variance transport equation. The SLTEST facility will produce low-speed, large length-scale boundary layers. The importance of these facilities is that they allow highly resolved spatial and temporal measurements. For the purposes of engineering applications such as aerodynamic vehicle drag reduction, fundamental understanding of transport mechanisms could be useful in design.