Modeling and Investigation of Complexities Induced by Constant Volume Combustion Frequencies in a Gas Turbine Engine

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Gheydi, Maryam | 2021

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 54179 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Ghorbanian, Kaveh
Abstract:
The objective of this research is to investigate the basic design challenges of a first stage turbine nozzle in a constant volume combustion (CVC) gas turbine engine. In general, CVC cycles have higher thermal efficiency and specific power despite their unstable combustion phenomenon which is due to moving as well as oscillating shock waves with a specific frequency and amplitude and resulting in a challenge to the engine designer. In this thesis, first, the performance parameters of CPC and CVC cycles are introduced and compared. Further, a model is developed to examine the flow non-uniformity, entropy generation, cycle thermal efficiency, and specific fuel consumption of a flow through the first stage turbine nozzle in a CVC cycle engine. The developed model is validated by other data from the public literature. The results indicate that while by increasing the nozzle blade number, the operating frequency, and the aerofoil max thickness reduces the thermal efficiency and increases the entropy generation; however, the flow leaving the nozzle becomes more uniform
Keywords:
Rotating Detonation Engine (RDE) ; Oscillating Flow ; Alternating Current ; Constant Volume ; Constant Volume Combustion (CVC) ; Gas Turbine Engines

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