Abstract
A computerized system for flow measurement is aimed to be developed which can afford the velocity measurement of multiple points at the same time. The system consists complimentarily of image processing of visualized flows and numerical computations of the continuity and Navier-Stokes equations ; first the velocity field of a scanned plane is measured by digitizing the path of tracers through image processing techniques, and then numerical computa tions are invoked to make the scanned plane flows three-dimensional and.to fill up unmeasu rable points by the image processing.In the present paper, the first part is mainly studied on plane flows ; a method of visualization of tracers and an algorithm to determine the velocity on a plane. The basic idea is to analyze three images of a tracer on successive frames which is crossing the slit beam with a finite thickness. They make it possible to distinguish the actual positions of the tracer. The slit beam is scanned to three-dimensionize of the plane flows. This idea is realized by an algorithm on a micro-computer which is applied to measure uniform flows, wake flow of a circular cylinder and unsteady channel flow.Although several points are still left to be improved for higher accuracy, the present system is proved to work basically well and the extension is confirmed to three-dimensional velocity measurements. It is primarily important to acquire stable pictures of tracers independent of the direction to camera, time and position.
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