A high-speed laser for Lagrangian particle tracking in unsteady flows

用于非定常流中拉格朗日粒子跟踪的高速激光器

• 批准号: RTI-2018-00429
• 负责人: Rival, David
• 金额: $ 10.78万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=642353
• 关键词: speed; laser; Lagrangian; particle; tracking

A state-of-the-art, high-speed laser system capable of 100kHz repetition rate and high pulse energies is requested in support of a minimum of four current PhD theses pertaining to Lagrangian flow measurements at high Reynolds numbers. With the availability of a new Lagrangian particle tracking technique known as 'Shake-The-Box', dense and long pathlines can be reconstructed in a number of unsteady and complex flows. Currently novel post-processing strategies in conjunction with this Lagrangian data are being developed in my lab so that for instance time-varying pressure fields are reconstructed, entrainment is estimated, and even interactions within dense suspensions are characterized properly. With these measurements we will, for the first time, be able to understand cause-and-effect relationships between body motion/shape and wake development. These insights would in turn change our perspective of many complex flows and in turn provide means to either control or further optimize. Therefore, considering the rapid changes in Lagrangian data reconstruction occurring now, an opportunity for significant and lasting impact will be made possible with the state-of-the-art laser-system requested here.

为了支持当前至少四篇与高雷诺数下的拉格朗日流动测量有关的博士论文，需要一种能够达到100 kHz重复频率和高脉冲能量的最先进的高速激光系统。随着一种新的拉格朗日粒子跟踪技术的出现，可以在许多非定常和复杂的流动中重建密集和长的路径线。目前，我的实验室正在开发与此拉格朗日数据相结合的新的后处理策略，以便例如重建时变的压力场，估计卷吸，甚至适当地表征稠密悬浮液中的相互作用。有了这些测量，我们将第一次能够理解身体运动/形状和尾流发育之间的因果关系。这些洞察力将反过来改变我们对许多复杂流程的看法，并反过来提供控制或进一步优化的手段。因此，考虑到目前正在进行的拉格朗日数据重建的快速变化，这里所要求的最先进的激光系统将使产生重大和持久影响的机会成为可能。