The nonlinear chemical reaction kinetics of NH4ClO4+Mg+K2Cr2O7 system II. Chemical models of the solid phase oscillatory combustion

The non-isothermic three-variable chemical model of the oscillatory combust ion of NH4ClO4 + Mg + K2Cr2O7 system is established in the present paper. T he nonlinear reaction kinetic character of this system is described by the results of numerical simulation. By applying mathematical methods for nonli near analysis, the mechanism of the nonlinear chemical kinetics of the soli d phase combustion is studied. The results show that the system has rich co ntent of the character of the nonlinear chemical kinetics. From the result of numerical simulation it can be seen that with the changi ng of the value of the nondimensional variable mu of NH4ClO4 when mu is bet ween mu = 0.00547863 and mu = 1.47185, the oscillatory period is different. When mu = 0.5678,0.591, 0.6378,0.6388 and 0.6478,the period -1, period -2, period -4, pseudo-period and period -3 oscillations are obtained respectiv ely. It can be recognized that the change of NH4ClO4 has influence on the o scillatory period. The result of numerical simulation is the same to the re action mechanism analysis of the experimental study. The non-isothermic three-variable chemical model studied in the paper not o nly considers the influence of concentration on the oscillatory period, but also analyzes the effect of temperature on the oscillatory combustion. The nonlinear numerical analysis method is combined with the chemical kinet ics reaction mechanism analysis of the pyrotechnics combustion in the prese nt paper. And the experimental and chemical models study are developed.