Particle Tracking in High Reynolds Number Turbulent Flows

高雷诺数湍流中的粒子追踪

• 批准号: 9988755
• 负责人: Eberhard Bodenschatz
• 金额: $ 51万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9988755&HistoricalAwards=false
• 关键词: Particle; Tracking; Reynolds; Number; Turbulent

In this research program the silicon strip technology from High Energy Physics detectors is further developed for three dimensional particle tracking. Fundamental questions about Lagrangian properties of turbulence are unanswered, and our ability to test theoretical models is very limited. Important unsolved problems include statistics of the fluid particle acceleration, inertial range scaling of the Lagrangian structure functions, and n-particle turbulent dispersion. This new technology allows to follow up to four particles in three dimensions at sufficient spatial and temporal resolution to provide the facility to measure single and multiple particle Langrangian statistics in the dissipation and interial range of high Reynolds number turbulence. Simultaneously, new ways are developed to generate very high Reynolds number isotropic and homogeneous turbulence in flows with no mean velocity. These measurements will provide much needed data to compare with theoretical predictions and may trigger new directions in theoretical research. In addition, they will give important information needed to address problems of turbulent diffusion in many processes ranging from turbulent combustion to pollutant transport in the atmosphere. It also promises the continued development of high speed strip detectors as a general purpose tool which can be used for many measurements where a weak light streak has to be followed in real time.

在这项研究计划中，高能物理探测器的硅条技术被进一步开发用于三维粒子跟踪。 关于湍流的拉格朗日性质的基本问题还没有答案，我们测试理论模型的能力非常有限。 重要的未解决的问题包括统计的流体粒子加速度，惯性范围缩放的拉格朗日结构函数，和n粒子湍流色散。 这种新技术允许在足够的空间和时间分辨率下跟踪三维中的四个粒子，以提供测量高雷诺数湍流的耗散和内部范围中的单粒子和多粒子拉格朗日统计的设施。 与此同时，新的方法被开发，以产生非常高的雷诺数各向同性和均匀的湍流中没有平均速度。 这些测量将提供急需的数据与理论预测进行比较，并可能引发理论研究的新方向。 此外，它们将提供处理从湍流燃烧到大气中污染物迁移等许多过程中湍流扩散问题所需的重要信息。 它还承诺继续发展的高速带检测器作为一个通用的工具，可用于许多测量弱光条纹必须遵循真实的时间。