淹没出流型漩流竖井泄洪洞新型连接型式及水力特性研究  

Novel type of revolving-flow drop-shaft with submerged outlet

作　　者：张建民[1] 任成瑶[1] 许唯临[1] 李忠[1] 胡晓禹[1] 

机构地区：[1]四川大学水力学及山区河流开发与保护国家重点试验室,成都610065

出　　处：《水力发电学报》2012年第5期96-101,共6页Journal of Hydroelectric Engineering

基　　金：教育部科学技术研究重点项目(200810811);新世纪人才支持计划(NCET-08-0378)

摘　　要：针对本文提出的一种新型淹没出流型漩流竖井泄洪洞开展模型试验研究,实现了在下游高水位情况下,旋流竖井高掺气水流通过导流洞时由无压向有压的平稳过渡衔接。通过在导流洞底部合适位置上设置挡坎、顶部设置排气孔和压坡等技术手段,先使水流在有限长度内剧烈混掺消能,其后通过挡坎和压坡的共同作用促使逸出的多余气体通过排气孔顺利排出。试验明确了各个流段不同的水流流态、功能及分区依据,并提出了相应的体型优化设计原则。试验结果表明导流洞内前半段为掺气水流,后半段基本上为清水状态,消能区冲击动压及脉动压力均方根最大值分别为150kPa和89kPa,总消能率能达到85%。为导流洞改建泄洪洞技术领域提供了一条新途径。Through model investigation a novel type of flood discharge tunnel with revolving-flow dropshaft, in which the flows transit smoothly and favorably from non-pressure flow to pressure flow. Having installed a threshold on the root of diversion tunnel, vent-pipe and slant pressure pad on the coping of diversion tunnel, the flows will be acute blending and energy dissipation in finite length of diversion tunnel. Excess gas will be vented through the vent-pipe in coping of the tunnel. The state of flows in different flow-segments, functions, basis and its relevant design philosophy of shape optimization have been determined. In recommended proposal, the flow is air-entrained flow in the first half of diversion tunnel and rinsing in the second half of diversion tunnel. The maximum of dynamic pressure and its root mean square of fluctuation pressure is about 150kpa and 89kpa, respectively. The coefficient of energy dissipation can be as much as 85%. Therefore, a good way was presented to rebuild diversion tunnel as the flood discharge tunnel.

关 键 词：水力学 双涡室旋流竖井 导流洞改建泄洪洞技术 流态衔接 试验研究 

分 类 号：TV131.2[水利工程—水力学及河流动力学]