摘要
本文结合某薄拱坝的泄洪中孔模型试验,对上翘型中孔进行水力特性的初步研究表明,该类中孔采用压力段上翘来完成急流转向,出流平顺、射程远,在大气中掺气充分,能较好地控制水舌的形态,特别适用于薄拱坝中孔单独挑流消能及与表孔对冲消能。压力段上翘角、挑坎挑角应按下游消能所要求的水舌出流的角度来设计。突扩掺气设施应同时满足流态、止水结构和布置上的要求。
For the medium outlets on which energy dissipation depends on the pattern of the free jet, it can be performed by the warping of the pressure intake to change the direction of rapid flow. The warped angle of the pressure intake must be designed in terms of the free jet angle which is necessary to energy dissipation, The pattern of the free jet from this type of medium outlets is good, the range of the free jet is long, and the free jet in the air is mixed up with air fully. We can control the pattern of the free jet well by means of the configuration of the medium outlet to meet the needs of energy dissipation of the free jet, so that it is adapted to thin arch dams to a wide range, The configuration of the pressure intake aeration facilities, the shape of the trajectory bucket, and the pulsating pressure on the wall above which the aerated flow passed, are discussed.
