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Simulation-based dynamic model and speed controller design of a small-scale turbojet engine

Isil Yazar (Department of Mechatronics, Eskisehir Osmangazi University, Eskisehir, Turkey)
Emre Kiyak (Department of Avionics, Anadolu University, Eskisehir, Turkey)
Fikret Caliskan (Department of Engineering, ITU, İstanbul, Turkey)
T. Hikmet Karakoc (Faculty of Aeronautics and Astronautics, Anadolu University, Eskisehir, Turkey)

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Article publication date: 5 March 2018

486

Abstract

Purpose

This paper aims to present a nonlinear mathematical model of a small-scale turbojet aeroengine and also a speed controller design that is conducted for the constructed nonlinear mathematical model.

Design/methodology/approach

In the nonlinear mathematical model of the turbojet engine, temperature, rotational speed, mass flow, pressure and other parameters are generated using thermodynamic equations (e.g. mass, energy and momentum conservation laws) and some algebraic equations. In calculation of the performance parameters, adaptive neuro fuzzy inference system (ANFIS) method is preferred in related components. All calculated values from the mathematical model are then compared with the cycle data of the turbojet engine. Because of the single variable control need and effect of noise factor, modified proportional–integral–derivative (PID) controller is treated for speed control. For whole operation envelope, various PID structures are designed individually, according to the operating points. These controller structures are then combined via gain-scheduling approach and integrated to the nonlinear engine model. Simulations are performed on MATLAB/Simulink environment for design and off-design operating points between idle to maximum thrust levels.

Findings

The cascade structure (proposed nonlinear engine aero-thermal model and speed controller) is simulated and tested at various operating points of the engine and for different transient conditions. Simulation results show that the transitions between the operating points are found successfully. Furthermore, the controller is effective for steady-state load changes. It is suggested to be used in real-time engine applications.

Research limitations/implications

Because of limited data, only speed control is treated and simulated.

Practical implications

It can be used as an application in the industry easily.

Originality/value

First point of novelty in the paper is in calculation of the performance parameters of compressor and turbine components. ANFIS method is preferred to predict performance parameters in related components. Second novelty in the paper can be seen in speed controller design part. Because of the single variable control need and effect of noise factor, modified PID is treated.

Keywords

Acknowledgements

The authors would like to thank the Tusas Engine Industries for their valuable contributions to their study. Thesis form of this study took a part in Tusas TEI library. It is expected that it will provide information to the current and upcoming research and design studies in Tusas TEI.

Citation

Yazar, I., Kiyak, E., Caliskan, F. and Karakoc, T.H. (2018), "Simulation-based dynamic model and speed controller design of a small-scale turbojet engine", Aircraft Engineering and Aerospace Technology, Vol. 90 No. 2, pp. 351-358. https://doi.org/10.1108/AEAT-09-2016-0150

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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