Abstract
This paper presents details of the design and validation of a complex nonlinear real-time simulation model for a civil turbofan aircraft engine. The model was developed in a modular fashion using wherever possible the underlying physics and avoiding empirical approximations
Highlights
This chapter contains a review of previous work on aero-engine modelling, and a summary of the novel contributions of this research.Computer simulation is a powerful tool for the mechanical and control system design of gas turbines
The model states are saved in the order that they are required by the simulation, should the simulation change and elements be added or removed, this order may no longer be valid because Simulink frequently rearranges the order of the states when the simulation is recompiled
The engine model discussed in this dissertation used as an initial template a Matlab-Simulink model provided by Alstom Aerospace - very little of this model remains, namely the fuel flame temperature lookup table! The Alstom model simulated the Alstom GTX100 gas turbine, a single shaft turbine used for power generation
Summary
Computer simulation is a powerful tool for the mechanical and control system design of gas turbines. It is generally accepted that a 1-D simulation is sufficient for accurate dynamic performance modeling and controller design. The simulation method used in this study is known as an aerothermal transient performance model [42] This method avoids iterative calculations by arranging the component equations to follow the direction of the gas path and introducing storage volumes between components to account for the unsteady balance of mass at compressor discharge, combustion chamber and between the turbines [8]. Most of the model’s implementation details are provided by initialisation scripts, and tuning the model is a simple matter of changing script details without the need to extensively modify Simulink modules, i.e. most variables are dynamically initialised from the Matlab workspace. Full flight-envelope validation of both the model and controller has been performed with the assistance of Alstom Aerospace, with the exception of engine start-up as this is not within the scope of the model
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