A swirlingstyle propellant water ramjet model was established on the basis of a particular model of columnstyle propellant water ramjet. The effect of swirling flow on the flow and reaction characteristics in the water ramjet was simulated by Fluent software. Turbulent flow simulation was performed using the standard kε two equation functions

and combustion reaction was calculated by finiterate/eddydissipation model. The functions were solved by implicit coupling calculation method based on the density. Results show that

adding swirling vanes and increasing the swirling angle can improve the maximum temperature

the average temperature

the outlet velocity and the specific impulse

which proves that adding swirling vanes make drastic improvements of flow and combustion reaction in the water ramjet engine

and the greater swirling angle means the better results.