Study The Capacity Of Pinching Ice By Water Flow Under The Condition Of Outflow From Sluice Hole

The ice is a worldwide problem, and appeared in many countries around the world. Our country is one of the serious ice regime countries in the world. The winter every year, the rivers and lakes exist different extent ice regime of about three-quarters of land area. The emergence of the river ice, it changes hydraulic conditions, thermal conditions and geometric boundary conditions of river. For Inner Mongolia river dike project, its standard is low, quality is poor and defense ability is deficiency, there are lots of safety problems. The phenomenon of Yellow River ice flood in the Inner Mongolia section is significant, the dike exists possibility of burst, easily led to more serious ice flood disaster.In this paper, it is studying the capacity of pinching Ice by water flow under the condition of outflow from sluice hole. Through the physical model test studying flow characteristics under ice cover that is formed by accumulation of ice cake in front of sluice, and simulating flow process and studying flow field structure using RNG k-ε turbulence Model and the VOF two-phase flow model, furthermore studying the capacity of pinching Ice.The main contents are as follows:(1) Through principle of model scale, the model is paraffin that is similar with the natural ice, making different experiment scheme and studying deeply migration of ice and capacity of pinching ice under the condition of outflow from sluice hole.(2) Through physical model tests, measured upstream water depth H, upstream marching velocity V and accumulation morphology of ice in front of sluice under different condition.(3)Based on the physical model, established two-dimensional mathematical model, simulated flow field below accumulation section of ice cake by using numerical simulation method, studied complementally some results that is not obtained by physical model tests.The main conclusions are as follows:(1) Analyzed water depth variation of existence and inexistence of ice upstream sluice, when sluice opening is certain, upstream water depth increases with increasing flow, when flow is also certain, compared with the condition without ice, upstream water depth will increase when the ice is exist. (2) Established the relationship between Fr, Fb, and sluice relative opening e/H by measuring and analyzing the value of the test, and draw the corresponding relationship formula.(3) For the different sluice opening, existed two condition:the ice get through sluice and the ice didn’t get through sluice, analyzed accumulation morphology of ice under two condition, the reslut showed that the length and thickness of ice accumulation is variant under different circumstances.(4) Obtained the critical velocity and the corresponding Froude number under the circumstance of each gate opening when the ice get through sluice.(5) Traceably calculate the free surface of the flow field using the VOF two-phase flow model, get the phase volume distribution of different time, it is identical with the actual situation. Simulated the flow field using the RNG k-ε turbulence model in the different test conditions, Obtained the distribution of velocity field below accumulation section of ice cake.Based on the actual data of the Yellow River in Inner Mongolia section, drawn the conclusion that possessed certain practical significance by experimental, numerical simulation and theoretical methods in this paper, and possessed certain reference value on the ice flood disaster prevention in the actual project.