Space-Time Evolution of Near-Wall Velocity Gradients that Generate Organized Streamwise Vorticity

产生有组织的流向涡旋的近壁速度梯度的时空演化

• 批准号: 9120076
• 负责人: Joseph Klewicki
• 金额: $ 19.41万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-03-15 至 1995-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9120076&HistoricalAwards=false
• 关键词: Space; Time; Evolution; Near; Wall

Experiments will be conducted aimed at clarifying the predominant mechanism leading to the generation of streamwise vortices at the wall in wall-bounded flows. A flush, wall mounted actuator will introduce distortions into a base laminar flow, ranging from pure strain to pure vorticity. Diagnostics will be from LIPA (Laser Induced Photochemical Anemometry). The experiments will quantitatively identify near-wall events initiating flow distortion, and have strong relevance to active boundary layer control.

将进行旨在澄清 产生流向的主要机制 在壁面有界流动中的壁面涡流。齐平的墙 安装的致动器将在基座中引入变形 层流，范围从纯应变到纯涡量。 诊断将来自利帕（激光诱导光化学 风速测定法）。 实验将定量识别近壁事件 引发流动扭曲，并与 主动边界层控制。