In this paper the subsonic intake and the propelling nozzle of aircraft gas turbine engines are modeled for the purpose of simulate. Each component is considered as a variable area duct which is divided into a number of elemental sections. Flow properties are calculated in a step by step manner in each section taking into account friction and area change. The underlying theory of the model and a brief description of the computer program are given. The program has been written in Fortran 77 and runs on IBM AT or 100% compatible micro computers.

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