We study the generalized Riemann problem of the Chapman-Jouguet model\nfor an ideal combustible Chaplygin gas. By analyzing the wave curves in the\nphase plane, we construct uniquely the solution of the generalized Riemann\nproblem under the global entropy conditions. We find that although there is\nno combustion wave of the corresponding Riemann solution, the combustion\nwave may occur after perturbation which reveals the instability of the unburnt\ngas.
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