Integration of Inlet and Engine — An Airplane Man’s Point of View

Inlet-engine integration is discussed from an “airplane man’s” viewpoint and is described as an opportunity to optimize the operation and performance of the propulsion system and to provide a better air vehicle. Areas requiring further effort are quantitatively evaluated and include inlet-engine airflow matching, the effect of engine stalls on duct weight and the role of inlet controls. Some examples of current practice are discussed including the use of boundary layer air for engine nozzle cooling, “rpm lockup” for airflow control, and the effect of a shock position limiting feature in the inlet control. A discussion of the management process for insuring inlet-engine integration is also included. Major emphasis is placed on team effort by both engine and airframe manufacturers, short communication channels, and strong upper management support.