Research On The Flow Pattern Improvement Of Downstream Approach Channel Of Yanshao Lock

This paper study on the upgrading technology of Yanshao low standard ship lock in order to improve the ship berthing conditions, reduce the lock time, enhance the ability of ship lock and improve the safety of ship.A three-dimensional mathematical model is established by using Fluent software aiming at the downstream approach channel of Yanshao lock. Compare the results of mathematical model with physical model to verify the reliability of the mathematical model. Analyze and compare each flow by doing numerical simulation of 11 kinds of situation and improvement scheme of water flow. The main results are:(1) From the results of field observation, model experimentation and numerical simulation in approach channel, we can conclude that water flow of three conditions are basically the same, the flow velocity are consistent, the mathematical model is correct and reliable.(2)Three different flow calculation results of present scheme show that:There exist multiple flow in downstream approach channel, the mainstream leans to the left, then leans to the right, then leans to the left, the flow characteristic is in disorder.(3) From the calculation results of 3 arc guide wall of different radius, we can conclude that: channel flow is obviously improved, and the bigger the arc guide wall radius increases, the more smoothly the flow becomes.(4) Setting a stilling basin in the downstream lock has certain effect on the flow pattern of approach channel:Increasing the pool depth decreases channel flow, improves the safety of ship dock.(5)In the case of arc guide wall with a stilling basin, if the downstream riverbed bottom height is changed to -2.5m, we can see that the downstream flow pattern improves significantly: there’s no swirl in downstream approach channel, the flow is smooth, and it will reduce the flow velocity in guide channel to some degree.