چكيده به لاتين
Turbofan engine is one of jet engines which is used in aerospace industries for decades and considered as specific kind of jet engines especially in commercial transportation according to its spectacular properties like more efficiency and less special fuel consumption in comparison with the other kinds of jet engines. As known, turbofan engine like other transportation systems needs the best designing to reach the best and safe performance during different flight conditions.
Control systems of such engines have been developed, so FADEC control system is used as software part and different control algorithms are used as software parts in control systems of these engines that is the result of developing in mechatronics science which is combined of electronics, mechanics, control and computer sciences. But also because of high performance ability of FADEC systems, designing and optimizing of the control algorithms is up-to-date challenge.
Performance analyzing and optimizing of control algorithm in turbofan engine during different flight conditions is surveyed in this project. To get this goal thermodynamic modeling of turbofan engine is done in three parts according to dynamic and thermodynamic equations of system: design point, steady state and transient. Min-Max controlling algorithm is used to control turbofan engine during transient performance. Min-Max controller must be rebuilt to be used in real time modeling during different flight condition. Flight conditions like Mach number, altitude and ∆T ambient is considered in last part of this project and the controller is generalized.
Modeling procedure and achieved results show that designed thermodynamic model of turbofan engine is exact and practical and has high flexibility.
Physical and performing limitations are satisfied by Min-Max controller according to different flight conditions and high pressure turbine’s inlet temperature, high pressure compressor’s outlet pressure, high pressure and low pressure shaft’s speed and acceleration, surge phenomena and flameout phenomena in combustion chamber are prevented to be occurred.
Keywords: turbofan engine, thermodynamic modeling, Min-Max controller, flight conditions.
