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Numerical Stimulation of Transition Flow Pattern in a Vortex Shaft with Submerged Outlet
Pages: 13-19
Year: Issue:  4
Journal: Journal of Sichuan University(Engineering Science Edition)

Keyword:  vortex shaft with submerged outlet flow pattern conversion turbulence model hydraulic characteristic;
Abstract: 旋流竖井泄洪洞的工程技术难题之一是:高尾水位淹没出流时的泄洪洞排气难,出口易发生气爆.对此,采用数值模拟的方法,结合某泄洪洞工程开展了相关的研究,获得了各个流段不同的水流流态、流速、压强以及消能率的沿程分布和特性,计算结果与实验结果符合良好.分析了水流由强紊动掺气状态过渡到有压流动状态的转换机制及其对结构的影响,研究表明,泄洪洞内水平段可分为掺混消能区、气泡逸出区、气体排出区和平稳流动区,其中掺混消能区是消杀能量的主要区域,该新型旋流竖井泄洪洞在淹没条件下,气体能够顺利排出,流态转换平顺,压强分布平稳,可为类似工程参考.
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