515 開閉水路共存系流れの過渡現象におよぼす初期水位の影響(混相流・自由表面を含む流れの諸問題I)(OS.7 混相流・自由表面を含む流れの諸問題)

概要

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In an underground drainage system, there is a problem that air will entrapped along the pipe at the transition from open channel flow to pressurized flow. The influence of flow conditions on such free-surfece-pressurized flows in a horizontal pipe, is examined by the modified slot model and by the experimentes. Transition time from open channel flow to pressurized flow and the initial volume of entrapped air are calculated under various initial depth of water and inflow rates. When the initial depth is small, the transition time has the same tendency as approximate curve obtained by statically replacing the volume of air by water and large inflow rate causes the initial volume of entrapped air to become large. However, with the initial depth being nearly equal to the inner diameter, the transition time and the initial volume of entrapped air varies noticeably because of the surface wave of water.
社団法人日本機械学会の論文
2001-03-09