| Abstract | A micro turbojet engine is modeled using energy and momentum equations, which are solved to predict its performance and the flow parameters across it at design conditions. In order to simulate the engine’s performance at off-design conditions, the complete performance maps of the different engine components are required. Therefore, empirical equations are used to predict the maps of the compressor and the combustion chamber, and then the off-design engine performance is obtained. The model results are compared with the results of a commercial software and verified with the experimental results. The analytical model predicts the experimental performance of the engine successfully (Thrust and fuel consumption), and it is proved to be more accurate than the used commercial software. The model's accuracy can be increased furthermore if there is more data available about the turbine performance map. The engine used in this study is mounted with a load cell to measure its net thrust and a fuel flow meter to measure its fuel consumption. It was already mounted with a temperature sensor at the exhaust and a rotational speed sensor. The variation of these parameters is monitored across its speed range of 33,000 to 112,000 rpm. |