The Study On The Flow Field Near Gate Slot By Numerical Simulation

The strobe plays an important role in controlling the flow, attempering the reservoir in security and utilizing water resource synthetically in water conservancy and hydraulic power engineering. As for the deep tunnel with high water level, when the strobe is open, the speed of the flow is as high as 30m/s or more, which will cause cavitation. The gate slots of the plate strobe are the place where the water is apt to cavitating. It is found that there are special regularities about the flow in the gate slots. How to utilize the regularities to design the form of the gate slot to prevent cavitation is an important question for discussion. In this thesis, the standard k—εturbulence model and mixture model are used to deal with the high-speed turbulent flow with cavitation. The aim of the paper is to study flow pattern including velocity distribution, pressure distributon and cavitation systemicly and to find out more about their character. Major studis are as follows:1. Setting up numerical model, then the formation and development of the eddy in 2D plate gate slot is simulated by unsteady method after the validity of the mesh and reliability of the result is tested.2.Simulating the flow field in its steady state statistically and analyzing the regularity of the velocity distribution and turbulence kinetic energy.3.The forms of the gate slot that influence the flow cavitation are studied. Every parameter of the gate slot is compared to discuss its influence on cavitation of the gate slot.4.3D numerical simulation is carried out with a specific project. The numerical results are consistent with the experiment data on the whole. The distribution law of the velocity and pressure of flow in the 3D gate slot is concluded.