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With increasing bulk flow velocity of the outer jet, the degree of flow divergence decreases, resulting in an increase in the height of the stagnation point.
The high levels of flame response for the outer enrichment case were attributed to the enhanced flame vortex interaction in outer jet shear layer.
In this paper the case of coaxial jets with normal velocity profiles is considered, where the inner jet stream velocity is higher than the outer jet stream velocity.
These effects lead to a decrease in the flame height as the ratio of the inner and outer jet velocities increases.
The results of an investigation of the flow field of two coaxially aligned jets consisting of an inner primary jet and a co-annular outer jet issuing from a nozzle with convex sidewalls are reported.
Heat flux uniformity was obtained by these two jets with acceptable errors less than 2% for the outer jet to the target surface diameter ratios of higher than 0.6.
Similar(50)
Above minimum fluidisation, the outer jets, nearest the wall of the fluidised bed, arched inward towards the central axis.
These reveal the mixing phenomena between the inner and outer jets as well as between the jet and the surrounding media, which are not presented in their counterparts.
The operating conditions are chosen to exemplify the effect of the coaxial jet outer shear layer initial spreading rates.
The large vortex structures at the jet outer boundary are the main factors that make the small particles to mix together.
In the absence of further outer forces the jet moves in a plane (e.g. e 1 - e 2 -plane) and its tangent τ can be described by a single angle α.
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