This paper reviews the requirements and the problems of engine air systems design. It considers, very briefly, the overall requirements of an engine air system and also the interface of the system with the overall thermodynamic performance of an engine. It then considers aspects of air systems design which are of particular interest to the design and performance of modern high pressure engines. Problem areas such as the cooling air transfer systems, extraneous cooling air heat absorption and transient thermal analysis of engine rotor and stator assemblies are considered.

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