Abstract: A computer program,so-called the Ejector Nozzle Sizing and Analysis Program (ENSAAP),has been developed for ejector nozzle sizing and analysis.It was applied to the required ejector slot heights by using models of the slot pumping,secondary air induction system,engine cycle and slot cooling effectiveness.For an example,an engine cycle and aircraft mission has been used to demonstrate the inlet/ejector sizing process,as well as the performance sensitivities to an ejector installation.This program provides an approach to the optimization of advanced aircraft performance with reduced IR signature.