Operational constraints definition of a turbojet engine MPM 20

This paper presents a general description of behavior of a complex thermodynamic system, represented by a small turbojet engine MPM 20. The main aim is to provide basic constraints of chosen measured parameters. Obtained results will be used in future data filtering, to recognize faulty output sensor values, critical situations and normal engine operation field. According to these constraints the engines´ operational envelope can also be defined by means of measured parameters. Also using constraints, we may divide the engine operation into several operational modes. These modes are dependent on the absolute value of a measured parameter, a coefficient of two parameters, or a coefficient calculated by more than two parameters.