Abstract
The present paper describes a one-dimensional model for a compressible internal flow with mass and heat additions in a constant area duct taking account of the upstream boundary layer. The conservation equations across a control volume are treated one-dimensionally by assuming an appropriate mean flow. This model can estimate the maximum amount of the mass flow rate on the flow choking for a given upstream free Mach number and boundary layer thickness. As the result, a parallel injection can add more amount of mass flow rate than normal injection in the present analytical condition. The characteristics of the flow such as the down stream Mach number, static pressure and total pressure distributions are analyzed with the boundary layer thickness for given upstream condition. Also, the analytical result of the present model shows better agreement with the previous experimental data on the mass and heat additional flows in constant area duct.
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