Abstract:In order to study the influence of bend flow on the hydraulic characteristics of outflow under gates of overflow dam, and explore the optimization measures to change the movement state of water entering the gate chamber at the bend, a physical model is established by taking the overflow dam at the bend of a reservoir as an example. Through the analysis of the test data under different flow levels, the influence of the gate hole deflecting flow of a reservoir overflow dam at the bend on the stability of the left and right banks and the discharge capacity of the gate hole are disussed. At the same time, the FLOW-3D software is used to set the guide wall measures for optimization numerical simulation. The results show that the water flows downward in a spiral way in the lock chamber, and collides and intersects on the left and right of the lock chamber and overflow surface, which make the water flow extremely unstable, and has a great impact on the stability of the left and right banks and reduces the discharge capacity of the gate hole. The magnitude of the increase in the discharge flow of adjacent gate holes is reduced, and the maximum difference is reduced from 1.95m3/s to 0.95m3/s; The setting of guide wall can effectively reduce the influence of the bend on the hydraulic stability of the gate hole flip, improve the discharge capacity of the gate hole, and provide a theoretical reference for the construction of the overflow dam at the bend.