Performance simulation of rotax 915iS PUNA MALE engine using AVL boost

This paper describes the process of simulating the performance of the Rotax 915 iS engine used on the PUNA MALE. The performance simulation is performed at ground level employing wide open throttle, typical Indonesian operation temperature 30 deegre Celsius. The aim of this paper is to conduct simulation of performance of the Rotax 915 iS engine to confirm the performance data issued by the manufacturer, and also to predict engine operation on the aircraft. This simulation is performed using AVL boost software, which employs a zero-dimensional and one-dimensional modeling system. The application of this software necessitates the creation of a virtual engine model, then requiring to enter engine component parameter data. Engine data parameters can be taken from the engine manual, whereas data not available from the manual can be obtained by carrying out measurements or searching from other sources. The performance results that can be obtained include: power, torque, fuel consumption and brake specific fuel consumption (bsfc). Simulation results show relatively small difference with the engine data provided by the engine manufacturer. Comparison of the simulation results of performance to engine data from manufacturer show an agreement in the trend of values for increasing engine speeds. However, there exists larger difference values at high engine speeds.