Multi-environment probability density function approach for turbulent partially-premixed methane/air flame with inhomogeneous inlets
- Title
- Multi-environment probability density function approach for turbulent partially-premixed methane/air flame with inhomogeneous inlets
- Author
- 김용모
- Keywords
- Multi-environment probability density; function model; Flamelet-generated manifolds; Turbulent stratified premixed flame; Flame stability; Combustion-mode transition
- Issue Date
- 2017-05
- Publisher
- ELSEVIER SCIENCE INC
- Citation
- COMBUSTION AND FLAME, v. 182, page. 190-205
- Abstract
- The present study aims to systematically evaluate the capability of a multi-environment PDF approach using non-premixed and premixed tabulated chemistry to predict the fundamental characteristics of turbulent partially-premixed piloted flames with near-homogeneous and inhomogeneous inlets. For the near-homogeneous case, the non-premixed manifold yields better agreement with measurements in terms of conditional mean, unconditional mean, and rms scalars; however, the premixed manifold generates a narrower hot flame zone, which is mainly attributed to its inability to account for diffusion in the mixture fraction space. For the inhomogeneous flame, the premixed and non-premixed manifolds are limited in their ability to reproduce the measured flame at upstream locations with multiple combustion modes, while the non-premixed manifold is reasonably good at predicting the unconditional and conditional profiles of all scalars in the downstream regions with dominant non-premixed combustion. In terms of the predicted environment-conditioned scalar profiles, the present multi-environment PDF approach demonstrated the ability to realistically predict the near-vertical transition from the fuel-rich flammable mixture condition to the stoichiometric pilot condition. Unlike the near-homogeneous case, the inhomogeneous case generates a distinctly different distribution of CO conditional means, where the peak conditional CO level is leaning to the richer side along the downstream region. This tendency is a clear indication of the flame transition from a premixed-dominated flame to a diffusion-dominated flame. Based on our numerical results, detailed discussions about the essential features of turbulent partially-premixed flames with multiple combustion modes are presented, as well as the limitations of the proposed approach. (C) 2017 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/abs/pii/S0010218017301542?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/114097
- ISSN
- 0010-2180; 1556-2921
- DOI
- 10.1016/j.combustflame.2017.04.020
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML