Asymptotic Solutions to a Class of Singular Perturbation Burning Models
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摘要: 讨论了一类具有两参数的非线性奇异摄动的燃烧模型.首先,利用摄动方法, 得到了燃烧模型的外部解;其次,引入一个伸长变量, 构造了燃烧模型解的初始层的校正项; 然后, 利用多重尺度方法和合成展开方法构造了模型解的边界层校正项, 并由此得到了原初始边值问题的渐近解;最后,利用微分不等式相关的理论证明了所得到的渐近解的一致有效性.用该文的求解方法简单而可行.Abstract: A class of nonlinear singularly perturbed burning models with two parameters were discussed. Firstly, the outer solution to the burning model was constructed with the perturbation method. Secondly, through the introduction of a stretched variable, the initial layer correction term of the solution to the burning model was constructed. Then the multi-scale method and the composite expansion method were used to build the boundary layer correction term of the model solution and find the asymptotic solution to the original initial boundary value problem. Finally, the uniform validity of the obtained asymptotic solution was proved according to the theory of differential inequalities. The proposed solving method for this class of nonlinear singularly perturbed burning models is convenient and practicable.
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Key words:
- burning model /
- asymptotic solution /
- singular perturbation
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