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A quasi-one-dimensional model is developed for hypersonic flow past a blunt body.It takes chemical nonequilibrium effects into account and solves reduced equations along the stagnation streamline.Validation examples show that the model predicts nearly identical results along the stagnation line as the numerical solution of full Navier-Stokes equations.The model is then applied to analyze the shock stand-off distance and gas dissociation in hypersonic flow over a blunt body.It is found that the shock stand-off distance is affected by both chemical and thermal nonequilibrium.The oxygen dissociation along the stagnation line varies with the flight altitude.The value of maximum degree of oxygen dissociation increases at first and decreases thereafter with the altitude, which is due to the combination effect of the equilibrium shift and chemical nonequilibrium relaxation.