关键词: 廊道体型, 阻力系数, 压降, 空化

Abstract: This paper introduces an experimental research and calculates the results of the analyses of two sorts of culvert shape behind the navigation lock valve (top expansion, sudden expansion). It compares two sorts of the flow state, the drag coefficient in valve, the lowest pressure and the decrease of pressure, the cavitation resistance characleristic at the bottom of the valve, etc. It also analyses the reasons why they are different. At the end of this paper, it recommends the instantly-expanded gallery which can keep valve cavitation off for the reference of the designers concerned.

Key words: culvert shape, drag coefficient, decrease of pressure, cavitation