一种新型舌瓣鼻坎消能工的应用研究

Study on Application of a New Type of Flip Bucket Energy Dissipater Shaped with Tongue Flap

为了解决大石涧水库碾压混凝土重力坝消能区河床集中冲刷问题,结合连续式和差动式挑流鼻坎体形的优点研究提出了一种新型舌瓣型鼻坎消能工,采用物理模型试验和基于Flow-3D的数值模拟研究方法对该新型挑流鼻坎进行了设计方案优化。研究结果表明:该新型消能工可使水流纵向展开、横向扩散,水舌在空中能够充分掺气碰撞消耗其能量,避免水舌集中冲刷河床;可通过调整舌瓣半径改变水流流态及其出流落点,使该新型消能工达到较好的消能防冲效果。

In order to solve the issue of concentrated scouring of the riverbed in the energy dissipation area of the RCC gravity dam of Dashijian Reservoir,combining with the advantages of continuous and differential flip bucket,a new tongue flap type nasal energy dissipater was proposed.The physical model test and Flow-3 D software numerical simulation were used to optimize the design of the new type deflector bucket.The result of research shows that:the new energy dissipation device enables the water flow to be drawn lengthwise and diffused laterally to form a special three-way flow.The water tongue in the air can be fully aerated collision to consume its energy and to avoid the water tongue concentrated scouring the riverbed;the ternary flow pattern and its exit point can be changed by adjusting the radius of the tongue flap.The new type of energy dissipation can achieve better effect of energy dissipation and impact prevention.