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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v2.i1.60
pages 75-82

APPLICATION OF IMAGE PROCESSING MEASUREMENT TO A RELATIVE FLOW IN A PUMP-TURBINE RUNNER

Hiroshi Hayami
Institute of Advanced Material Study, Kyushu University, Kyushu, Japan
Dexin Chen
North China Institute of Water Conservancy and Hydroelectric Power, China
Toru Koso
Institute of Advanced Material Study, Kyushu University, Kyushu, Japan

ABSTRACT

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.