Development of a physically based axial compressor model

Aero-engines operate in regimes limited by both rotating stall and surge. The design of controllers allowing to operate close to compressor stability limit and capable of preventing rotating stalls and surge. The Moore-Greitzer cubic model (MG3) [1984, 1986] provides a simplified description of open-loop behavior of an axial compressor. The simple description of the pressure rise in the compressor is not related to the variations of isentropic efficiency and to their causes. In this paper, a dynamic model operating as the MG3 is presented. A velocity triangle model and the modeling of the phenomena causing isentropic losses replace the cubic model. The compressor model while being more complex than the MG3 model is simple enough to be integrated in a control model.