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Numerical Analysis of Effects of Twin Swirler Injector on Turbine Combustion Chamber Performance

Jalalabadi, Abolfazl | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44665 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Farshchi, Mohammad
  7. Abstract:
  8. The objective of current research is to investigate the effects of Twin Swirler Injector on performance of turbine combustor. For this purpose, the swirlcup is assessed in a dump combustion chamber. The resultant simplicity in geometry leads to a facilitation in parametric studies as well as a reduction in modeling and meshing time. The target swirlcup, is a simplified model of CFM56 engine’s swirlcup.
    Standard k-ε model is established to take into account turbulence effects. The non-reacting flow is at first simulated for capturing and recognising different phenomena. Adiabatic reacting flow simulations are conducted with Probability Distribution Function using Steady Laminar Flamelet model. Numerical solutions are then validated for both reacting and non-reacting flows. Flamelet Library is created using Methane as fuel, for which the chemical kinetics utilize a mechanism with 37 species contributing in 191 reactions.
    Parametric studies are then conducted with variations in swirl number of each swirler as well as the overall equivalence ratio. The results reveal that in constant equivalence ratio, an increase in secondary swirler’s swirl number yields a reduction in pattern factor as well as in maximum temperature, moreover, maintaining a constant length, the central recirculation zone is expeditiously shifted away from fuel injector. Additionally, with leaner mixtures similar results were observed in exit temperature profiles as well as a considerable reduction in CO emissions and the wall temperatures
  9. Keywords:
  10. Three-Dimensional Simulation ; Combustion Chamber ; Swirl Number ; Flamelet Model

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