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Numerical Simulation of Turbulent Partially-Premixed Flames using Strained Flamelet Model

Rasouli Oskouei, Ehsan | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58067 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Salehi, Mohammad Mahdi
  7. Abstract:
  8. The aim of this thesis is to use the strained flamelet model to numerically investigate the turbulent partially-premixed flame to observe the strain effects in the flame. Calculations are based on averaged Reynolds equations based on a Bunsen burner geometry (for a premixed flame) and flame close to blow-off (for a partially-premixed flame). The simulation of the flame in this thesis is done by Fluent software. Since the Fluent software is not open source, the innovation in this research is the implementation of the flamelet model in the Fluent software. It is important to be able to apply strain effects to the flame correctly and with good accuracy. Fluent takes the strain into account globally, but the strain in the flame varies locally. Also, Fluent's turbulence speed has problems in high turbulence intensity (high strain). The innovation in this thesis is the calculation code in C language that uses the ability of defining functions and control variables (reaction progress variable, strain rate variable and mixer fraction). This method can be used in the physics of different flames, such as partially-premixed and premixed flames, as well as for different fuel combinations and in different geometries. By modeling and solving the combustion in the flame, the combustion chemical reaction takes place in the flame and the strain rate and flame length are calculated in each state. Finally, to check the numerical results and validate the method used to calculate the strain rate, the OH species is used for the flame with a blow-off, and CH for the premixed flame. Experimental velocity data are available at different radial distances for both burners. The results of this research show that the use of strained flamelet method has improved the results of Fluent
  9. Keywords:
  10. Combustion ; Turbulence ; Partially Premixed Flame ; Laminar Flamelet ; Strain ; Velocity

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