摘要详情
162 / 2024-02-23 19:37:45
Hydraulic characteristics of inlet flow of plunging dropshaft
Pumped storage power plant,plunging dropshaft,orifice,discharge capacity,cavity,dynamic pressure
摘要录用
Pumped storage power plants will be built in large numbers because of their significant role in carbon reduction. The plunging dropshaft spillway tunnels are widespread used as release works of pumped storage power plants. This plunging dropshaft has the characteristics of high heads and large discharges, but the research on the dropshaft was rarely reported. In this work, the physical model tests were conducted, and the flow of two kinds of inlets of shaft was observed. The inlets types of plunging dropshaft include sharp crested weir inlet and bell-mouth-shaped inlet. Several middle piers were settled at the inlet along the circumferential direction, and many discharge orifices were formed. The jets from different orifices impacted each other and then converged and dropped down to shaft bottom. In addition, the splashed water generated by jets impaction dropped through the cavities between the adjacent jets. Based on the cavities filling between the adjacent jets, two kinds of flow regimes were observed. One is that the cavities were fully filled by splashed water. In this case, pressure oscillation in shaft might occur due to disabled ventilation at the inlet. The other is that the cavities were partly filled. As a result, the air could be ventilated from the atmosphere. Obviously, the latter is better. The experimental results demonstrated that, for sharp crest weir inlet, the cavities between the adjacent jets were easily drowned, whereas for the bell-mouth-shaped inlet, the cavities could connect the shaft and atmosphere. Furthermore, the hydraulic characteristics of bell-mouth-shaped inlet of dropshaft were researched based on numerical simulation, including flow regimes, discharge capacity and dynamic pressure distribution. The variables in the study include the orifice inlet width, the orifice outlet width and the weir head, etc. Based on the numerical simulation results, a formula for estimating the discharge capacity of bell-mouth-shaped inlet of dropshaft is presented, and the behaviors of dynamic pressure distribution and water depth along the orifice are summarized, which can provide reference and support for practical engineering design.
重要日期
-
会议日期
10月14日
2024
至10月17日
2024
-
09月30日 2024
初稿截稿日期
-
10月17日 2024
注册截止日期
主办单位
国际水利与环境工程学会亚太地区分会
承办单位
长江水利委员会长江科学院
四川大学
四川大学
联系方式
- Congress Secretariat
- se******@iahr-apd2024.com
- +86*********
