Issue |
E3S Web Conf.
Volume 136, 2019
2019 International Conference on Building Energy Conservation, Thermal Safety and Environmental Pollution Control (ICBTE 2019)
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Article Number | 02040 | |
Number of page(s) | 5 | |
Section | Integrated Application of Renewable Energy in Buildings | |
DOI | https://doi.org/10.1051/e3sconf/201913602040 | |
Published online | 10 December 2019 |
Numerical investigation of low-velocity filtration combustion instability based on the initial preheating non-uniformity
1 School of Environment and Energy Engineering, Hefei, 230009 China
2 Key Laboratory of Huizhou Architecture in Anhui Province, Hefei, 230009 China
Anhui Jianzhu University
* Corresponding author: yongfangxia@126.com
The effects of the initial preheating perturbation on the dynamical behaviors of FGC wave propagation instability for low-velocity FGC in packed bed are studied numerically. The behaviors of the flame front inclination, break, and shrinking instabilities are always observed in experiments. Based on the experimental phenomena, an initial thermal perturbation model is numerically proposed as to predict the deformation behaviors of the flame front instabilities. The typical flame shapes are obtained depending on filtration velocity, equivalence ratio, and initial preheating temperature difference. It is demonstrated that the development of flame front inclination instability is proportional to the magnitude of initial preheating perturbation. At a lower equivalence ratio, the initial thermal perturbation of 300 K leads to the evolution of flame front break. Increasing filtration velocity leads to the appearance of flame front break, due to the intensification of the hydrodynamic instability. In addition, a perculiar instability of flame front shifting is also confirmed with the initial thermal perturbation of 400 K, which results in a fuel leakage of incomplete combustion.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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