On-Design and Off-Design Performance Modeling of a Heavy Turbofan Engines<br/>

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On-Design and Off-Design Performance Modeling of a Heavy Turbofan Engines

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 41697 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Mazaheri, Karim
Abstract:
Here we study on-design and off-design analysis of twin spool turbofan engines and also we present scaling methods to produce the characteristics performance maps of compressors and fans. Mathematical modeling of engine performance has been performed by serial nested loops algorithm. Performance of components have been modeled by performance maps, thermodynamic snd gas dynamic equations. The working fluid supposed to be a perfect gas and the effects of water vapor existing in atmosphere are neglected. In hot and cold sections of the engine, different thermo-physical properties are used. Mathematical modeling procedure of a turbofan engine, is complex. Therefor, initially, the off-design performance of a single spool power generating gas generator and subsequently single spool turbojet and twin spool turbojet are analysed. Finally the off-design performance of a mixed flow turbofan engine is simulated and the generated performance diagrams have been analysed. Results are compared with existing results to validate the computational algorithm
Keywords:
Off-Design Condition ; Design Point Conditions ; Engine Performance ; Serial Nested Loops ; Scaling Method

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