Several nitramine propellants are quenched at different initial pressure(up to 300 MPa)by rapid pressure decay in a small-sized ballistic simulator, which is different from the ordinary vented chamber in that it creats the burning environment of the propellant similar to that gun bore,and that the initial pressure before the extinction are relatively high.

The Ψ-Z curves describing the shape functions of the multilayer disc gun propellant with different parameters were obtained and the combustion model was validated by the interrupted-burning test.