부산대학교 도서관

Recently, importance of hydraulic power generation is more increasing owing to its availability of flood prevention and decarbonization. Accordingly, demand for dam discharge valves has been increasing. However, there remains problems to improve reliability of the valve systems because of complicated two-phase flows take place in the valve. Therefore, in this study, we examine a link-sleeve valve (LSV), which is usually used for public water supply, as a dam discharge valve. In general, to prevent cavitation erosion, vibration, and noise, air is injected from atmosphere into the downstream pipe of dam outlet work. Since LSV has been used in the public water supply where the air aspiration cannot be used due to consideration of sanitation, the air aspiration methodology for LSV has not been investigated. In order to clarify the characteristics of the air entrainment by water jets in the LSV, experiments were conducted. As a result, there was similar analogy with a jet pump at high water flow rates, while air suction characteristics shows complicated characteristics at low water flow rates.