Numerical Simulation And Experimental Research On The Energy Dissipation Effect Behind The Gate Of Erdaokan Stilling Pool

In the northern plains,porous sluices often have small openings that are different from the design conditions.The discharge flow has a large flow rate and energy is concentrated.After exiting the stilling pool,there will be a second hydraulic jump,which is easy to cross the canal behind the sluice.Cause erosion damage.To choose a reasonable energy dissipater form,it is very important to scientifically determine the size of the structure.Numerical simulation and physical model tests are used to compare the flow characteristics and energy dissipation effects of the two-deck stilling pool and the traditional deep-dug stilling pool to provide a basis for improving the damage of energy dissipation and anti-scouring facilities behind the gate.The main research contents and results are as follows:(1)Analyzed the damage to the downstream caused by the multi-hole gate when part of the holes were opened with small openings,and discussed the research status and control measures of non-standard hydraulic jumps at home and abroad.(2)According to the design conditions of the sluice,the main design parameters and dimensions of the Erdaokan stilling pool were calculated and determined,and 12 test schemes were formulated by changing the number of openings of the sluice,the opening of the sluice and the upstream and downstream water levels.(3)The RNG k-? three-dimensional turbulent flow numerical model was established using CFD fluid mechanics software,and 12 kinds of working conditions were numerically simulated in the CFD software,and the flow patterns of different working conditions were obtained.The analysis results show that when the gate opening number,opening degree,and upstream and downstream water levels are the same,the length of the rapid section behind the gate of working conditions 2,4,6,8,10,and 12 is significantly shorter than that of working conditions 1,3,5,and 7.,9,11.Use CFD software to post-process the simulation results,analyze the energy dissipation effect of the Erdaokan stilling pool and the deep-dug stilling pool from the four angles of the recirculation zone length,water level,cross-section flow rate and pressure.The energy dissipation effect of the pool is better.(4)According to the principles of geometric similarity,motion similarity and dynamic similarity,the physical model of the sluice gate is established in a ratio of 1:100.Physical tests are carried out corresponding to the numerical simulation working conditions.By comparing the flow pattern,the central water level of the mainstream,and the discharge flow of the sluice in the numerical simulation and physical tests,it is concluded that the energy dissipation effect of the Erdaokan stilling pool is better.