Both the interior ballistic simulation model and the launch efficiency evaluation model are established to discuss the launching process of the fire monitor driven by compressed air.A simulation program is developed based on the C++platform,and the effects of driving pressure and loading conditions on the muzzle velocity and launch efficiency are studied.Results show that the model and program can effectively simulate the launching process of the fire-extinguishing bomb driven by compressed air.With the increase of initial gas pressure,the muzzle velocity of the fire-extinguishing bomb will also increase,but the energy conversion efficiency of the compressed gas will de-crease.With the increase of the loading position,both the muzzle velocity of the fire extinguishing bomb and the ener-gy conversion efficiency of the compressed gas decrease slightly.The mass of the projectile only affects the muzzle ve-locity and has no direct effect on the energy conversion efficiency of the compressed gas.The research results can pro-vide some theoretical guidance for determining the working parameters of the fire monitor driven by compressed air.
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