Modeling of Gas Turbine Engine Compressor Surge Based on Equilibrium Manifold

Stable operation of gas turbine engine compressor is constrained by rotating surge. In this paper, an approximate nonlinear surge margin model of gas turbine engine compressor by using equilibrium manifold is presented. Firstly, the expansion form of equilibrium manifold is introduced. Secondly, the property of the expansion form is discussed, and the effect of mapping design to the form is systematically studied. Then, this paper also gives the identification procedure of modeling the approximate nonlinear model and the deteriorated performance of compressor was discussed. Finally, the modeling and simulations with the gas turbine engine high pressure compressor surge margin show that this real-time model has the same accuracy with the thermodynamic model, but has the simpler structure and shorter computation time.