The Measurement of Unsteady Flow Phenomena by Flow Tagging

基于流标记的非定常流动现象测量

• 批准号: 9212457
• 负责人: Richard Miles
• 金额: $ 28.89万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-05-15 至 1996-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9212457&HistoricalAwards=false
• 关键词: Measurement; Unsteady; Flow; Phenomena; Tagging

An experimental technique for unsteady flow measurements will be further developed. The technique involves the tagging through laser exitation of molecules in a flow field, forming a line written in the flow. This line is then interrogated during its susequent deformation by rapid laser pulses. The technique can give statistical turbulence information without intruding instruments within the flow. The writing of crossed lines or grids can give data for vorticity and shear. Non-intrusive measurement techniques are important for extracting flow details from highly transient flows, where instabilities and turbulence are as yet insufficiently characterized for predictive modeling purposes.

将进一步开发非定常流动测量的实验技术。该技术涉及通过激光射出流场中的分子进行标记，形成在流中写入的线。然后，该线在随后的变形过程中受到快速激光脉冲的询问。该技术可以提供统计湍流信息，而无需侵入流内的仪器。交叉线或网格的书写可以提供涡度和切变的数据。 非侵入式测量技术对于从高度瞬态流动中提取流动细节非常重要，其中不稳定性和湍流的特征还不足以用于预测建模目的。