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Experimental investigation of the soot free lengths of methane laminar diffusion flames at sub-atmospheric pressures
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Experimental investigation of the soot free lengths of methane laminar diffusion flames at sub-atmospheric pressures
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Journal Article
Experimental investigation of the soot free lengths of methane laminar diffusion flames at sub-atmospheric pressures
2025
Overview
This study investigates and quantifies the soot free length (
L
b
) and soot free length fraction (
SFLF
) of methane laminar diffusion flames at sub-atmospheric pressures (20–100
kPa
), which are rarely reported in literature. Methane-buoyant laminar diffusion flames are produced using a circular aperture burner with an inner diameter of 8 mm, and a series of fire tests is conducted in a hypobaric chamber with internal dimensions of
3
×
2
×
2
m
. The mass flow rates in this study are set to 2.988–8.365 mg s
−1
. The results indicate that for steady and tip-flickering flames, the total flame length increases with pressure
L
f
∼
P
1
/
5
. However, for bulk-flickering flames, the total flame length is nearly constant with
L
f
∼
P
0
. Additionally, both
L
b
and
SFLF
decrease with an increasing ambient air pressure. For a given pressure, both the
L
b
and
SFLF
decrease with an increasing mass flow rate (or heat release rate). The Reynolds number (
Re
), which has been successfully used to characterize the
L
b
and the
SFLF
of buoyant turbulent jet flames, fails with buoyant laminar diffusion flames. The dimensionless soot free length correlates well with the nondimensional heat release rate. Moreover, a prediction correlation for the
SFLF
of methane-buoyant laminar diffusion flames is developed, which could effectively unify the experimental data in the current work.
Publisher
Springer International Publishing,Springer,Springer Nature B.V
Subject
