Comparison Research on Experiment of Deep Discharge Tunnel Body
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Abstract:
The hydraulic characteristic of high-speed flow is a key issue in selection of discharge structures. The deep discharge tunnel of a hydropower station was reconstructed from an existing diversion tunnel. In the design process, two schemes were considered: the vortex shaft discharge tunnel and the ogee discharge tunnel. Through the comparison and analysis of hydraulic model tests, the ogee discharge tunnel showed many advantages, including simple structures, investment saving, stable flow, and high discharge capacity. The cavitation erosion problems caused by the high-speed water flow can be solved using the measures of shape optimization and aeration facilities. After the comprehensive comparison of the two schemes, the ogee discharge tunnel was adopted.
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