4.4 Article

Flame Propagation and Oscillation in a Millimeter-scale Constant Volume Space

Journal

COMBUSTION SCIENCE AND TECHNOLOGY
Volume 193, Issue 10, Pages 1747-1765

Publisher

TAYLOR & FRANCIS INC
DOI: 10.1080/00102202.2020.1713768

Keywords

Micro-combustion; constant volume chamber; flame propagation; instability; propane

Funding

  1. Foundation of CAS Key Laboratory of Renewable Energy [y907j91001]
  2. Transformational Technologies for Clean Energy and Demonstration
  3. Chinese Academy of Sciences [XDA 21060102]
  4. National Natural Science Foundation of China [51976219]
  5. Foundation of State Key Laboratory of Coal Combustion [FSKLCCA1804]

Ask authors/readers for more resources

The flame propagation speed decreases as the combustion chamber height decreases, but increases with increasing initial pressure. Under suitable initial pressure, periodic stagnation of flame propagation may be observed. The initial pressure affects only the amplitude, not the frequency, of the oscillation in unstable flame propagation.
Flame propagation pictures of a propane/air mixture are captured by a high-speed camera in a visualized constant volume combustion chamber with a diameter of 150 mm, a parallel plate height of H = 1.45 mm, and an initial pressure of P-0 = 1.25 similar to 3.00 bar, in the range of flammable equivalence ratios. The results show that when H of the combustion chamber decreases, the range of the flammable equivalence ratios greatly decreases. As the equivalence ratio increases, the flame propagation speed first increases and then decreases. Due to the combined effects of the wall surface and heat loss, the propagation speed is maximum at a rich mixture of approximately phi = 1.4. As the initial pressure increases, the flame propagation speed increases. The initial pressure has an enhancing effect on flame propagation in small space. At phi = 1.5 similar to 1.6, under a suitable initial pressure, the phenomenon of periodic stagnation of flame propagation is observed. The instability in this flame propagation is caused by the combination of the wall surface, Darrieus-Landau instability, diffusive-thermal instability and Taylor instability. The Taylor instability and initial pressure play important roles in the periodic oscillation of unstable flame propagation. However, the initial pressure can change only the amplitude of the oscillation, not the frequency.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.4
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available