The Structure and Evolution of Streamwise Vortices by Pitched and Skewed Wall Jets

斜壁射流和斜壁射流流向涡流的结构和演化

• 批准号: 9305943
• 负责人: James Johnston
• 金额: $ 26.71万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-04-01 至 1998-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9305943&HistoricalAwards=false
• 关键词: Structure; Evolution; Streamwise; Vortices; Pitched

9305943 Johnston A type of vortex generator here called VGJ (for vortex generator jets) is to be investigated experimentally. Skewed jets injected from a wall into the adjacent boundary layer flow are known to generate streamwise vortices that can be used for boundary layer and separation control. Their detailed mechanisms and range of behavior are still poorly mapped out. This investigation is to obtain detailed measurements of mean and turbulent velocities in various cross-stream planes downstream if the injection ports. The basic experimental tool is LDV, and the experiments are to be conducted in a water flow facility. Flow visualizations will also be obtained. Such devices could be useful for the control of separation, but unlike conventional solid body vortex generators they offer the possibility of active control. ***

9305943约翰斯顿 本文对一种称为VGJ（涡流发生器射流）的涡流发生器进行了实验研究。已知从壁面喷射到相邻边界层流中的斜射流产生流向涡，该流向涡可用于边界层和分离控制。它们的详细机制和行为范围仍然很难确定。本研究旨在获得喷射孔下游不同横流平面内的平均速度和湍流速度的详细测量值。基本的实验工具是LDV，实验将在水流设施中进行。还将获得流动可视化。 此类装置可能有助于控制分离，但与传统的固体涡流发生器不同，它们提供了主动控制的可能性。 ***