The Measurement of Unsteady Flow Phenomena by Flow Tagging

非定常流测量的实验技术将 进一步发展。这项技术包括标记 通过激光激发流场中的分子， 写在流水中的一行。然后询问这条线路 在其随后的快速激光脉冲的变形过程中。的 技术可以给出统计湍流信息， 侵入流内的仪器。十字架的书写 线或网格可以给出涡度和切变的数据。 非侵入式测量技术对于 从高度瞬态流中提取流细节，其中 不稳定性和湍流还不足以 其特征在于用于预测建模目的。

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.