反应NH_4ClO_4+Mg+K_2Cr_2O_7的非线性化学动力学——Ⅱ.固相振荡燃烧的化学模型

The Nonlinear Chemical Reaction Kinetics of NH_4ClO_4+Mg+K_2Cr_2O_7 System——Ⅱ. Chemical Models of the Solid Phase Oscillatory Combustion

建立了NH_4CLO_4+Mg+K_2Cr_2O_7固相振荡燃烧体系的非吸热三变量立方自催化化学模型,应用非线性数学分析方法,研究了固相振荡燃烧的非线性化学动力学机理,并对此进行了数值模拟,结果反映了这一振荡燃烧体系所具有的非线性化学动力学特性.

The non-isothermic three - variable chemical model of the oscillatory combustion of NH4ClO4 + Mg+ K2Cr2O7 system is established in the present paper. The nonlinear reaction kinetic character of this system is described by the results of numerical simulation. By applying mathematical methods for nonlinear analysis, the mechanism of the nonlinear chemical kinetics of the solid phase combustion is studied. The results show that the system has rich content of the character of the nonlinear chemical kinetics.From the result of numerical simulation it can be seen that with the changing of the value of the nondimensional variable μ of NH4ClO4 when μ is between μ = 0.00547863 and μ = 1.47185, the oscillatory period is different. When μ = 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 respectively. It can be recognized that the change of NH4ClO4 has influence on the oscillatory period. The result of numerical simulation is the same to the reaction mechanism analysis of the experimental study.The non - isothermic three - variable chemical model studied in the paper not only 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 kinetics reaction mechanism analysis of the pyrotechnics combustion in the present paper. And the experimental and chemical models study are developed.