The mathematical model of non-equilibrium thermal process of steam accumulator and the mechanics model of aircraft based on Newton's law and gas dynamics for some thermal system was established. Based on the test date

the simulation result was tested and verified. The kinetic and thermodynamic comprehensive simulation of the steam process for different carrier-based aircraft mass was analyzed. The results was showed as follows:when the mass of the aircraft is 8

20

35 t

the end speed of aircraft is bigger than 72 m/s

the maximum acceleration is less than 6g and the time of catapult is less than 3 s. With the aircraft mass becoming greater

the steam discharging mass becomes larger

the end pressure of steam accumulator becomes lower

as while the down rate of the pressure of cylinder is small and the leaking quality of cylinder is bigger.