Loading...

Numerical Investigation of Soot Formation in Laminar and Turbulent Diffusion Flames

Dehghan Suraki, Danial | 2021

377 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53884 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Salehi, Mohammad Mahdi
  7. Abstract:
  8. In this study, the performance of the Moss-Brooks semi-empirical model in estimating soot for six different diffusion flames with methane, ethylene, and kerosene fuels in laminar and turbulent regimes has been investigated. The results show that the model with the default constants in the laminar ethylene flame has relatively acceptable performance, but in the turbulent ethylene flame as well as the laminar and turbulent flames of methane, has a significant error. In this regard, inspired by past research and performing sensitivity analysis, the constants of oxidation and coagulation sub-models were reviewed and Improved. The results of soot volume fraction were evaluated for values of 0.015 and 1 for oxidation constant and for values of 9, 18, 27, and 45 for coagulation constant. These sensitivity analyses showed that in laminar flames for oxidation constant quantity of 1 and in turbulent flames with a value of 0.015 for this constant, the model will have a better performance for estimating soot. On the other hand, in most of the studied flames, due to the overestimation of the default model for the soot volume fraction values, with increasing coagulation constant, the results have less error than the experimental values. Also, to increase the simulation accuracy in fuels containing higher hydrocarbons, modifications were applied to several different sub-models. The results show that the improved model has a much better performance in estimating the volume fraction of soot and also predicting the smoke generation phenomenon. The axisymmetric assumption was used in the simulation of flames. Also, k-ε and DO models were used to simulate turbulence and radiative heat transfer, respectively
  9. Keywords:
  10. Soot ; Combustion ; Numerical Simulation ; Turbulent Flow ; Pollutant ; Turbulent Diffusion ; Laminar Diffusion Flame ; Laminar Flow

 Digital Object List

 Bookmark

No TOC