Reynolds Number Effects on Boundary Layer Turbulent Transport

雷诺数对边界层湍流传输的影响

• 批准号: 9905526
• 负责人: Joseph Klewicki
• 金额: $ 18万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-12-15 至 2002-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9905526&HistoricalAwards=false
• 关键词: Reynolds; Number; Effects; Boundary; Layer

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.

本项目的目的是确定雷诺数在湍流边界层结构中的作用。 将在表面层湍流和环境科学（SLTEST）设施中，在雷诺数为103至106的范围内，对输运方程中的重要项进行测量。 SLTEST设施利用了流经犹他州西部大盐湖沙漠的大气表层。 探针将提供描述轴向应力和浓度变化的传输的方程中的各个项的空间和时间分辨的测量。 还将对速度-涡度相关进行测量。 一个标量输运探测器，由两个光电离传感器和四个热线，将被用来获得有关的标量方差输运方程的数据。SLTEST设备将产生低速、大长度尺度的边界层。 这些设施的重要性在于它们能够进行高分辨率的空间和时间测量。 对于工程应用的目的，如空气动力学车辆减阻，运输机制的基本理解可能是有用的设计。