一套应用于拖曳水池中的水下立体粒子成像测速(PIV)系统的调试运行
In January 2004, Memorial University purchased a stereoscopic Particle Image Velocimetry(PIV) system for making flow measurements. Although the system was potentially veryversatile, its primary application was envisioned to be in a towing tank. The system wassupplied as a complete package of hardware and software for calibration, data collection andanalysis. The intention of the PIV system designers was to collect as many data frames aspossible for a fixed measurement plane location, relative to the model. This required the PIVsystem to be fixed on the towing carriage, moving with the model being studied. It was foundduring some preliminary experiments that an active seeding delivery system was necessary toensure sufficiently high seeding particle concentration, especially when measuring flowvelocities around a model hull with a large yaw angle. This paper describes the development ofa seeding technique for a PIV system that can be used in a towing tank. The paper also includesan estimate of the uncertainty of the measurement system, including the analysis of the flowbehind the device used to deliver seed particles into the flow.