LINEAR DYNAMICS OF SUPERSONIC RAMJET

This paper presents a mathematical model of a supersonic ramjet.The basic thermoaerodynamical equations of ramjet components are linearized in conformity with small perturbation.Then the transfer functions of the components are deduced on the S domain.With the method of subsystem in series,the dynamical mathematical model of the ramjet with the inlet normal shock position,the parameters along duct and thrust is formulated under the perturbation of upstream Mach number,temperature,pressure and downstream fuel flow rate of the ramjet.A numerieal example of digital imitation of a real ramjet is completed and gives reasonable results.