Exact(5)
Theoretical investigation and computer modeling is leading to a better understanding of how spark flames propagate.
For ∼6.5%flames propagate until radiative extinction, never evolving into flame balls, while for XH2>∼11%, the expanding spherical flames develop asymptotically into planar propagating flames.
Triple (or tribrachial) flames propagate through mixtures faster than the premixed laminar flame speed due to streamline divergence ahead of the flame base that decelerates the flow into the leading edge of the flame.
It was determined that n-octane/air flames propagate the fastest, followed by 2- and 3-methylheptane/air, 2,5-dimethylhexane/air, and iso-octane/air flames, confirming that the overall reactivity decreases as the extent of fuel branching increases.
In small-scale laboratory experiments, spherical flame propagation occurs in aluminum dust clouds contained within 30-cm-diameter latex balloons, whereas in large-scale tests, flames propagate vertically through unconfined aluminum dust clouds with a vertical scale of about 4 m.
Similar(55)
Constant pressure flames propagating downwards were observed.
Axisymmetric and non-axisymmetric gasless flames propagating in a narrow cylindrical sample of an energetic material are considered.
Outside of these detonability limits, failed detonations produced decaying detached shocks and flames propagating with velocities of approximately 1/2 DCJ.
A burner for the investigation of lean stratified premixed flames propagating in intense isotropic turbulence has been developed.
Laminar, premixed methane air flames propagating through the annulus of a Taylor Couette burner were studied experimentally.
Furthermore, the reaction zone is affected by turbulence in the same way as hot flames propagating in an unburnt mixture.
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