Original scientific paper

https://doi.org/10.21278/TOF.40305

Research on Energy Dissipation in a Discharge Tunnel with a Plug Energy Dissipater

Ai Wanzheng ; Marine College of Zhejiang Ocean University, Zhoushan , P. R. China
Liu Hu ; Marine College of Zhejiang Ocean University, Zhoushan , P. R. China

Abstract

Plug energy dissipater, as a kind of effective energy dissipater with economic characteristics, has become very popular. The energy loss coefficient and the minimum wall pressure coefficient of the plug are two important factors in the plug energy dissipater design. In this paper, the two coefficients and relative parameters, such as the contraction ratio of the plug diameter to the flood discharge tunnel diameter, the ratio of the plug thickness to the tunnel diameter, and the Reynolds number of the flow through the plug, were analysed by theoretical considerations, and their relationship expressions were obtained by numerical simulations and were verified by experimental data. It could be concluded that the two coefficients were mainly dominated by the contraction ratio of the plug. The lower contraction ratio of the plug is, the larger are the two coefficients. The research results demonstrate that effects of the Reynolds number on the two coefficients can be neglected when this number is greater than 105; the relative thickness of the plug has little impact on them and can be neglected.

Keywords

plug; contraction ratio; energy loss; wall pressure; cavitation

Hrčak ID:

168707

URI

https://hrcak.srce.hr/168707

Publication date:

22.11.2016.

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