In the present study, the performance analysis of a single nozzle ejector system used in the aircraft compact heat exchanger applications is carried out. CFD procedure is validated with the experimental data. Ejector fluid inlet pressure and temperature are varied as parameters. Velocity, pressure and temperature contours are plotted for the three different cases. It is observed that the length of the velocity cone is longer if the primary pressure is higher. Also noted that, if the flow velocity is high, temperature is low as expected. The performance of the ejector system at the low and high air temperature is also compared.