Abstract:To analyze the effect of mitigating salt instrusion of the air curtain of the estuarine ship lock under low concentration salt water conditions under different inlet pressures and the salinity of the lock chamber,a two-dimensional model of the air curtain for mitigating salt instrusion of the ship lock is established based on the VOF multiphase flow model and the Realizable k-ε turbulence model of CFD software.The three-phase flow simulation of the air curtain for mitigating salt instrusion process under different inlet pressures and salinity of the estuarine lock is carried out.The simulation results show that the effect of mitigating salt instrusion of the ship lock air curtain is related to the inlet pressure of the bubble curtain.When the water level is 8 m and the salinity of the lock chamber is 2.5 ‰,there is an optimal inlet pressure that maximizes the effect of mitigating salt instrusion of the ship lock air curtain;When the inlet pressure is closer to the optimal inlet pressure,the exchange rate of saltwater and freshwater is lower,the mitigating salt instrusion coefficient of the air curtain is larger,and the effect of mitigating salt instrusion of the air curtain is better.The optimal inlet pressure is related to the salinity of the chamber,and the higher the salinity of the chamber,the greater the optimal inlet pressure of the air curtain.When the salinity of the lock chamber increases,the inlet pressure should be increased in time to achieve a reasonable effect of mitigating salt instrusion.
