Performance Evaluation of an Aerial Spark Ignition Engine Equipped by Turbocharger and Intercooler

Nowadays, CAD/CAM simulation is considered as a strong tool to estimate performance of various systems and to reduce costs and testing time. In this study, we used GT-Power Software to model the performance of an SI engine. The results indicate that the engine power drops significantly as altitude increases. To compensate power loss, the engine is equiped with a turbocharger system. The proper turbocharger was selected with regard to the surge and choke limits of its compressor, as well as its compatibility with the engine (at mass flow rate point of view). To avoid engine knock, we used a special wastegate mechanism. Also, to reduce the temprature of the flow after compressor, we defined a proper type of intrcooler system. we used the experimental results derived in our engine lab. The results show that by using turbocharger and intercooler, the engine brake power improves. In addition, the specific fuel consumption decreases and the volumetric efficiency increases. Also, NOX emission reduction and safer cyclic performance of compressor are the effects of intercooling.