MRI: Acquisition of an Integrated High Frame-Rate Particle Image Velocimetry (HFR-PIV) System

MRI：采集集成高帧率粒子图像测速 (HFR-PIV) 系统

• 批准号: 0821608
• 负责人: Martin Wosnik
• 金额: $ 23.41万
• 依托单位: University of New Hampshire
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0821608&HistoricalAwards=false
• 关键词: MRI; Acquisition; Integrated; Frame; Rate

CBET-0821608WosnikThis MRI project funds for the acquisition of an integrated High Frame-Rate Particle Image Velocimetry (HFR-PIV) system, to obtain highresolution, time-resolved, whole-field, quantitative experimental data in a variety of turbulent flows. Time-resolved whole-field flow measurements - inaccessible prior to the development of HFR-PIV systems - have the potential to greatly advance our understanding of flow physics, and will play an important role in the creation of advanced simulation tools, for example the parametrization of subgrid-scale processes for large eddy simulations. HFR-PIV will also be a key measurement technique to be used in the NSF EPSCoR-funded large scale facility for the development and testing of sensing, prediction, actuation and control technologies in high Reynolds number turbulent boundary layer flows (Klewicki et al. 2006). The instrumentation will be used by the principle investigators and their research groups, other UNH researchers working in experimental fluid dynamics, as well as students in new graduate experimental courses. Intellectual Merit: The instrument allows spatial structure to be understood in the context of its temporal evolution. This capability is a primary obstacle preventing our understanding of complex fluid phenomena. For example, high frame-rate PIV of both the liquid and gas phases in cavitating flows will, for the first time, provide a bridge between the large body of qualitative work (high speed photography, videos) and quantitative flow measurement. In turbulent boundary layers, advancing the current state of knowledge of the transport mechanisms requires flow field information that captures the interactions across spatial scales of the dynamical motions as these motions evolve in time. More broadly, a description of these scale interactions is precisely the information required in the development of viable subgrid models in LES computations. The HFR-PIV system uniquely provides this capability. Current research activities that will benefit directly from the HFR-PIV system are:- Investigation of cavitation dynamics on hydrofoils and turbine blades, a first step towards control of partially cavitating flows- Scale separation effects on the dynamical mechanisms of turbulent boundary layers- Experimental Studies of Separated Flows with Polymer Ejection for Control of Turbulence Generated Noise- Development and Testing of Viable Ocean Turbine Designs for In-Stream Tidal EnergyBroader Impact: The thesis research and research education of approximately 8 Ph.D, 12 M.S. and a number of undergraduate students will be directly affected by the availability of this instrument through the three years of this grant. The instrument will be used in newly created experimental graduate courses. Additionally, the time-resolved quantitative flow visualization movies that come naturally from research activities will be used in undergraduate fluid mechanics education. Having an experimental tool that can inspire students to explore the complexity of fluid phenomena will make it easier to attract students of all backgrounds to this subject. Many broader societal impacts may also result from the integration of the HFR-PIV system into the described activities. For example, the outcomes from the research on high Reynolds number boundary layers, which are omnipresent in many natural processes and technologically important flows. Similarly, this instrument will substantively increase our capacity to explore fluid dynamical phenomena important to the development of alternative energy related technologies. This capability directly supports broader, College-wide, initiatives.

CBET-0821608 Wosnik该MRI项目资助了一个集成的高帧率粒子图像测速（HFR-PIV）系统的收购，以获得各种湍流中的高分辨率，时间分辨，全场，定量实验数据。时间分辨全场流测量-在HFR-PIV系统开发之前无法实现-有可能大大提高我们对流物理的理解，并将在创建高级模拟工具中发挥重要作用，例如大涡模拟的亚网格尺度过程的参数化。HFR-PIV也将是NSF EPSCoR资助的大型设施中使用的关键测量技术，用于开发和测试高雷诺数湍流边界层流中的传感、预测、驱动和控制技术（Klewicki等人，2006年）。该仪器将由主要研究人员及其研究小组，其他UNH研究人员在实验流体动力学工作，以及在新的研究生实验课程的学生使用。智力优势：该工具允许在其时间演变的背景下理解空间结构。这种能力是阻碍我们理解复杂流体现象的主要障碍。例如，空化流中液相和气相的高帧率PIV将首次在大量定性工作（高速摄影、视频）和定量流量测量之间架起桥梁。在湍流边界层中，推进当前状态的知识的传输机制需要流场信息，捕获跨空间尺度的动态运动的相互作用，因为这些运动在时间上的演变。更广泛地说，这些规模的相互作用的描述正是在LES计算可行的亚网格模型的发展所需的信息。HFR-PIV系统独特地提供了这种能力。目前的研究活动，将直接受益于HFR-PIV系统：-调查空化动力学的水翼和涡轮机叶片，第一步控制 部分空泡流.尺度分离对紊流附面层动力机制的影响.控制紊流用聚合物喷射分离流的实验研究 产生的噪音-开发和测试可行的海洋涡轮机设计的流潮汐能更广泛的影响：论文研究和研究教育约8博士，12硕士。在三年的拨款期内，不少本科生会直接受到这套仪器的影响。该仪器将用于新创建的实验研究生课程。此外，时间分辨的定量流动可视化电影，自然来自研究活动将用于本科流体力学教育。有一个实验工具，可以激发学生探索流体现象的复杂性将更容易吸引各种背景的学生到这个主题。将HFR-PIV系统集成到所述活动中还可能产生许多更广泛的社会影响。例如，高雷诺数边界层的研究成果，这是无处不在的许多自然过程和技术上重要的流动。同样，这一工具将大大提高我们探索流体动力学现象的能力，这些现象对开发替代能源相关技术至关重要。这种能力直接支持更广泛的，学院范围内，倡议。