In order to more better reveal the multiphase flow charac teristics of synthetic gas passing through the liquid cistern in scrubbing-cooling chamber of a coal-water slurry gasifier

a dynamic simulation of gas jet flow process with submerged top has been carried out by using the liquid volume model

and the flow characteristics of flow field state

the developing process and the process proper under different air flow velocity and different sudden expansion ratio being analysed in detail.A comparison of the calculated result with the tested result has been carried out

results of study show that:the process is a flow process of top-submerged gas jet flow with negative buoyance

adverse pressure gradient

and sudden expansion;the power function relation is existing between the maximal penetration depth of gas and the momentum flux at the gas outlet;along with decrease of the sudden expansion ratio

the synthetic gas is strengthened

the amount of liquid drops and air bubbles being increased

and the liquid level being enhanced.The calculated result tallies well with that of experiment.