For the heat transfer and condensation of overflow steam in the aircraft steam catapult

a mathematical model was developed to understand the three-fluid flow with the air

steam and condensation water. The module of thermodynamics international association for the properties of water and steam (IAPWS) was incorporated into model system by self-developed user defined function (UDF) code. Eulerian-Eulerian model was used to solve the three fluid flow

exchange of mass

momentum

and energy was included into model equations

moreover

nucleation and growth of liquid droplet were added into mass transfer. Result showed that the mix of the air

steam and condensation water caused the temperature homogenization. Suction volume of steam increased with the decrease of inlet pressure of engine. The condensation phenomena happened with the decrease of steam temperature

and condensation water occurred. Suction volume of steam increased first and then decreased with the increase of air velocity. With the increase of steam velocity

the suction volume of steam increased and the air proportion decreased.