Tomographic Particle Image Velocimetry System

拟议研究的重点是定量成像复杂的，分离的流动，发生在广泛的工程系统，包括船舶螺旋桨，天然气输送管道，波浪能装置和风力涡轮机。这些应用的特点是高度三维流动，这在计算建模和实验表征方面提出了巨大的挑战。******粒子图像测速技术（PIV）已经在维多利亚大学流体力学实验室实施，以获得全局的、定量的流动模式，从而提高对流体流动的理解。PIV的实现包括用示踪粒子播种流，获取脉冲激光照射的粒子图像，以及对所得速度矢量模式进行后处理。******虽然这种基于图像的方法为流动物理提供了实质性的见解，但目前实验系统的局限性之一是它只能记录速度矢量在激光片平面上的投影。越来越广泛的PIV应用需要对面外速度分量有更多的了解。恢复完整的速度分量最常见的方法之一是使用额外的相机从不同的观看方向进行额外的PIV记录，这通常被称为层析PIV。******所要求的设备将包括高速数码相机、激光和断层成像PIV校准硬件和软件。该设备将大大提高实验能力，并扩大共同申请人目前所进行的研究的实际应用范围。所要求的设备将为研究生在工程系统设计的各个方面以及在最先进的实验技术的应用方面的培训提供重要的机会。

The focus of the proposed research is quantitative imaging of complex, separated flows that occur in a wide range of engineering systems, including marine propellers, gas transport pipelines, wave energy devices and wind turbines. These applications are characterized by highly three-dimensional flows, which present formidable challenges in terms of computational modelling and experimental characterization. ******A technique of particle image velocimetry (PIV) has been implemented at the Fluid Mechanics Laboratory at UVic to obtain global, quantitative flow patterns that lead to improved understanding of the fluid flow. Implementation of PIV involves seeding of the flow with tracer particles, acquisition of images of the particles that are illuminated by a pulsed laser, and post-processing of the resultant patterns of velocity vectors.******While this image-based approach provides substantial insight into the flow physics, one of the limitations of the present experimental system is that it is only capable of recording the projection of the velocity vector into the plane of the laser sheet. An increasingly wide range of PIV applications require additional knowledge of the out-of-plane velocity component. One of the most common approaches to recovering the complete set of velocity components involves additional PIV recording from a different viewing direction using an additional camera, which is generally referred to as tomographic PIV.******The requested equipment will include a high-speed digital camera, a laser and tomographic PIV calibration hardware and software. This equipment will significantly enhance the experimental capabilities and expand the range of practical applications of the current research undertaken by the co-applicants. The research that will be enabled by the requested equipment presents significant opportunity for the training of graduate students in various aspects of design of engineering systems as well as in application of the state-of-the-art experimental techniques.