As an important part of the steam catapult of the warship

the marine steam accumulator has the characteristics like short charging and discharging time

large instantaneous steam consuming. Its operating performance determines directly the safety and stabilization of the steam catapult. The experimental system of the marine steam accumulator was established. The experiments of charging

discharging

continuous charging and discharging were carried out under different conditions with the superheated steam as the steam source. The experimental results showed that a strong non-equilibrium thermodynamic process was exhibited that the pressure first rose (dropped) sharply and then dropped (rose) with close of the charging (discharging) valve and finally turned to stable during the period of charging (discharging) steam. The pressure drop ratio caused by non-equilibrium thermodynamic process increased along with increase of the charging energy per unit time. The change of the steam accumulator temperature was later than that of the pressure

the change of the water temperature was later than that of the steam. The research on the non-equilibrium thermodynamics process of marine steam accumulator will provide technical support for operation of the steam catapult.