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Dynamic Performance Simulation of a Turbofan Engine with Inlet Flow Distortion

Sedigh, Parviz | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53506 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Ghorbanian, Kaveh
  7. Abstract:
  8. Turbofan engines are widely employed as the propulsion unit in commercial aircrafts. Turbofan engines may experience inlet flow distortion during their operation which may alter the performance magnitude and stability of the engines. In this research, an object-oriented (modular) model for turbofan engine components is developed by using Simulink/Matlab. Through the integration of the 1D models and the related thermodynamic equations for the engine components, the engine design point is determined. The off-design performance matching across the different components is established by scaling the characteristics and incorporating matrix iteration method. The spool dynamics is used to simulate the transient response of the turbofan engine to the changes in the fuel flow rate. Further, the parallel compressor method is employed to model the inlet flow distortion. The results indicate that the inlet flow distortion generates two operating points in the related performance maps. While these two points are on the same speed line for the fan, they differ in speed lines for the compressor which are caused by temperature distortion at the inlet of the compressor. It should be pointed out that the higher the air inlet distortion to the fan, the larger will be the magnitude between these two points which brings the operation point closer to the surge boundary and ultimately affecting its efficiency.
  9. Keywords:
  10. Turbofan Engine ; Dynamic Simulation ; Inlet Flow ; Inlet Flow Distortion ; Engine Performance

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