In this paper, the
effects of different ignition positions and
equivalence ratios on the explosion characteristics of syngas in a
half-open Hele-Shaw duct were investigated. The ignition points are
set at distances of 0 and 500 mm from the closed end. Moreover, the
research range of equivalence ratio is 0.8–1.2. The experimental
results indicate that different ignition positions and equivalence
ratios influence the flame front structure and the dynamic characteristics
of flame propagation. When the ignition position is at the closed
end, the flame front undergoes several typical propagation stages
before eventually reaching the open end of the duct. The time required
by the flame to reach the open end decreases as the equivalence ratio
increases. Meanwhile, when the ignition is in the middle of the duct,
the flame simultaneously spreads to the open and closed ends. The
time required to reach both sides decreases with the increase in the
equivalence ratio. The flame front structure and pressure are primarily
affected by the ignition position and the equivalence ratio. At the
same ignition position, flame propagation velocity and maximum overpressure
increase with the equivalence ratio. The pressure oscillation becomes
more intense when the ignition position is close to the open end.
At IP
500
, when the equivalence ratio is 0.8, multiple finger-shaped
flame fronts emerge, accompanied by high-frequency flame oscillations.
This study can provide guidance for the study of the flame propagation
characteristics of syngas in millimeter-scale burners.
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