新型竖井泄洪洞自调流机理和特性研究

该文提出一种新的由自调流潜水起旋墩为核心构成的旋流环形堰竖井泄洪洞,在泄洪流态和消能防蚀方面与常规喇叭形竖井泄洪洞有较大不同。为明晰该新体型的调流机理和系统水力特性,对新型环形堰竖井泄洪洞进水口、旋流泄洪洞、出口的复杂水流运动进行了数值模拟研究,获得了该新体型进水口流态、旋流空腔发展过程、竖井内部流态、平洞自由水面、压力等主要水力要素的分布规律。结果表明:计算得到的上述水力学要素分布规律与模型测量趋势上一致,量值上吻合较好。模拟结果也较好揭示了自调节潜水起旋墩的旋流、自调流机理以及泄洪洞的消能原理。

Self-adjusting mechanism and characteristics of newly vortex drop shaft spillway

To overcome the limitations such as commonly vortices in inlet and complicated cavitation control measures of vortex drop shaft spillway,a novel shaft spillway which consists of submersible and spiral-flow-generated piers and morning glory weir is developed.Compared with the traditional morning glory shaft spillways,such newly interior energy dissipater has much difference in the hydraulic characteristics such as vortex flow and corrosion resistance mechanism.The behavior of the newly type of inlet and the performance of the vortex drop structure is investigated and simulated by using commercial computation hydromechanics software.The hydraulic characters such as the flow pattern,air core distribution,position of the annular hydraulic jump,pressure and water profiles of the outlet tunnel are obtained.It shows that such distributions of the above hydraulic elements agree well with the measured data.Besides,the simulated results help to reveal the self-adjusting mechanism and energy dissipation principle of the newly vortex drop shaft spillway.