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EMERGENCE ANGLE OF FLOW OVER AN AERATOR 被引量:5

EMERGENCE ANGLE OF FLOW OVER AN AERATOR
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摘要 Aerator is an important device for release works of hydraulic structures with high-speed flow in order to protect them from cavitation damage. This kind of protecting effect is related closely to cavity length below the aerator, while the cavity length is dominated by the emergence angle over the aerator. Therefore it is crucial to determine this angle accurately. In the present paper the affecting intensities of flow depth and the fluctuating velocity on this angle were analyzed through two introduced parameters. Furthermore, the improved expressions of emergence angle estimation, for both ramp-type and step-type aerators, were presented by means of 68 sets of experimental data from 6 projects based on error theory. The results showed that the present method has higher accuracy than the previously reported methods. Aerator is an important device for release works of hydraulic structures with high-speed flow in order to protect them from cavitation damage. This kind of protecting effect is related closely to cavity length below the aerator, while the cavity length is dominated by the emergence angle over the aerator. Therefore it is crucial to determine this angle accurately. In the present paper the affecting intensities of flow depth and the fluctuating velocity on this angle were analyzed through two introduced parameters. Furthermore, the improved expressions of emergence angle estimation, for both ramp-type and step-type aerators, were presented by means of 68 sets of experimental data from 6 projects based on error theory. The results showed that the present method has higher accuracy than the previously reported methods.
出处 《Journal of Hydrodynamics》 SCIE EI CSCD 2007年第5期601-606,共6页 水动力学研究与进展B辑(英文版)
基金 supported by the National Natural Science Foundation of China (Grant No. 50539060) the Innovative Project of Graduate Student in Jiangsu Province (Grant No.2005-60).
关键词 AERATOR cavitation damage cavity length emergence angle flow depth fluctuating velocity aerator, cavitation damage, cavity length,emergence angle, flow depth, fluctuating velocity
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