A component-based time-resolved particle image velocimetry system for unsteady fluid flow diagnostics

本提案是为了购买一个时间分辨粒子图像测速（TRPIV）系统。TRPIV是流体力学中的一种速度测量技术，它可以在给定的测量平面内提供足够的时间分辨率的速度场。该系统由三个主要部件组成：(i)高帧率CMOS相机，（ii）高重复率脉冲激光器提供照明和定义测量平面，（iii）数据采集计算机用于控制和同步相机和激光器，获取相机图像，并处理图像以获得速度场。该系统将成为Peterson博士在滑铁卢大学（UW）建立的一个新的非定常和生物流体力学实验室的基石。生物流体流动（如心脏产生的脉动性血液流动）固有的不稳定特性要求测量系统不仅能够获得高空间分辨率的全场数据，而且能够获得时间流动的发展。例如，壁面剪切应力的空间和时间梯度与心血管疾病的发生和发展有关，这一点已经得到了很好的证实。具体来说，所要求的设备将用于Peterson博士同时提出的发现基金申请中的研究项目，该项目侧重于相干流体结构（如泵心脏中产生的漩涡）和可变形智能材料带之间的影响，以获取能量，为微电子设备和传感器提供动力。流体/结构相互作用本身具有非定常和空间变异性，因此需要具有足够时间分辨率的全场测量系统。所要求的TRPIV系统对于在实验流体科学的前沿建立一个功能齐全的流体力学研究项目至关重要。

This proposal is for the purchase of a time-resolved particle image velocimetry (TRPIV) system. TRPIV is a velocity measurement technique for fluid mechanics that provides the velocity field within a defined measurement plane with adequate temporal resolution. The system consists of three primary components: (i) a high frame rate CMOS camera, (ii) a high repetition rate pulsed laser to provide illumination and define the measurement plane, and (iii) a data acquisition computer used to control and synchronize the camera and laser, acquire the camera images, and process the images to obtain the velocity field. The proposed system will be the keystone of a new unsteady and biological fluid mechanics laboratory being established at the University of Waterloo (UW) by Dr. Peterson. The inherently unsteady nature of biological fluid flows, such as the pulsatile blood flow produced by the heart, necessitates a measurement system capable of acquiring not only high spatial resolution full field data, but the temporal flow development. For example, it is well established that both spatial and temporal gradients of the wall shear stress have been implicated in cardiovascular disease initiation and progression. Specifically, the requested equipment will be used in the research program proposed in Dr. Peterson's concurrent Discovery Grant application, which focuses on the impact between coherent fluid structures (such as vortices produced in a pumping heart) and a deformable smart material strip towards energy harvesting to power micro-electronic devices and sensors. The fluid/structure interaction is inherently unsteady and spatially variant, thus requiring full-field measurement system with sufficient temporal resolution. The requested TRPIV system is vital for the establishment of a fully functional fluid mechanics research program at the forefront of experimental fluid science.