The gas viscous flow in the high-pressure air ejection device causes energy dissipation and pressure loss

and may change the performance of the interior ballistics. An energy loss calculation method was obtained for the non-fully developed unsteady flow. An interior ballistic model was established on the basis of the real gas effects for the high-pressure air ejection device under the gas friction effects. The numerical experiments were performed. The results show that the gas friction effects cause little errors for the quick gas expansion

and the performance of the missile changes not too much. The gas friction effects can be ignored in the low precision system. However

the law curves show that the gas friction effects reduce the energy quality

and slow down the gas expansion rate. Besides

the gas friction effects make the pressure in the low pressure chamber unequal

and generate the mass flowrate fluctuation from high pressure chamber to low pressure chamber. The missile collision occurs because of the gas friction.