Abstract
It is of great significance to study the ventilation characteristics of air supply systems in spillway tunnels, especially for high dams. In this paper, a brief theoretical approach to evaluate the ventilation characteristics of a multi-intake-well air supply system was established, which was mainly derived from the Bernoulli equation and continuity equation. With this approach, an analysis of the ventilation characteristics of the Jinping-I project spillway tunnel was carried out. A comparison of the theoretical results and prototype data suggested the theoretical approach to be valid and practical. The value of the drag coefficient at the air-water interface should be calibrated before evaluation because the drag coefficient is crucial for the accuracy of theoretical results. In addition, the influences of certain structural factors of the spillway tunnel and air intake well on the ventilation characteristics of multi-intake-well air supply systems are investigated.
Highlights
Cavitation damage is a common problem of high-velocity water in hydraulic engineering [1,2,3]
The analysis indicates that the number of air intake wells has a large effect on the ventilation characteristics of the air supply system at the Jinping-I project
A brief theoretical analysis method on evaluating the ventilation characteristics of the multi-intake-well air supply system is established. This method is derived from the Bernoulli equation and the mass conservation equation at the steady state, and it takes into account the confluence and diversion of the air flow
Summary
State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Civil Engineering, Tianjin University, Tianjin 300072, China.
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