Publicado 4 números por año
ISSN Imprimir: 1065-3090
ISSN En Línea: 1940-4336
Indexed in
APPLICATION OF IMAGE PROCESSING MEASUREMENT TO A RELATIVE FLOW IN A PUMP-TURBINE RUNNER
SINOPSIS
Fluid flow in a small model of a Francis-type pump turbine was visualized by means of a tracer method and was imaged using a video camera rotating with the runner. The relative velocity vectors of the fluid flow were analyzed from the video images using a digital image processing technique based on the correlation method. The flow patterns are discussed in relation to the characteristics of the pump turbine. At a zero incidence inflow condition, the reverse flow zone on the suction surface of the blade is much less than that at a shockless inflow condition. Unsteady flow patterns at a low flow rate are also demonstrated. The problems that occur in the image processing measurement and the countermeasures are discussed.
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