Abstract:

An interior ballistic model is established on the basis of modified corresponding virial equation for the high-pressure air ejection device under the wide variation conditions of pressure and temperature. The second and third virial coefficients of modified corresponding state equation are calculated. Based on the virial equation of volume series form which is truncated to the third virial coefficient, the analytical expressions of specific thermodynamic energy and specific enthalpy are presented, and the dynamic ther- modynamic parameters are obtained. The numerical experiments are performed. The changing rules of thermodynamic properties and missile acceleration and velocity are obtained. The results show that the compression factor reaches 1. 107, and both the actual decreased values of temperature and pressure are higher than the ideal decreased values in the hyperbaric chamber, and the work capability of hyperbaric air deviates from the ideal gas, and it is necessary to study real gas effects.

Key words: ordnance science and technology, missile ejection system, interior ballistic, real gas effects, virial coefficient