Effects of oxygen concentration on radiative loss from normal-gravity and microgravity methane diffusion flames

Bahadori, Mohammad; Edelman, R. B.; Stocker, Dennis P.; Sotos, Raymond G.; Vaughan, David F.

doi:10.2514/6.1992-243

Cited by 3 publications

(2 citation statements)

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“…The radial edge of flame becomes clearer with increased co-axial flow implying narrower flame zone of diffusion flame, while the boundary of flame edge at the tip of flame is not clear even with maximum flow velocity in the figure. The similar unclear boundary can be seen in earlier observation of non-buoyant round laminar jet diffusion flames in microgravity [3,4,[21][22][23][24]. These flames are free from flickering phenomenon, a unique instability of buoyant laminar jet diffusion flames in normal gravity.…”

Section: Resultssupporting

confidence: 74%

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Effect of Co-Axial Flow Velocity on Soot Formation in a Laminar Jet Diffusion Flame under Microgravity

Jeon

Fujita

Nakamura

et al. 2007

JTST

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To examine the effect of low co-axial flow on soot formation in a laminar jet diffusion flame, microgravity experiments have been conducted. The tested co-axial flow velocity range is 0-7.3cm/s, which is very difficult to provide on the ground because of suffering from the additional external flow induced by buoyancy force. The result showed that the soot formation characteristics were greatly affected by co-axial flow velocity at the low flow velocity range, that is, soot concentration increased with increase in the external flow velocity. According to the radial distributions, the effect of external flow velocity on the soot formation was prominent near the outer edge of visible flame. A comparison with numerical calculation suggested that the increase of soot concentration was caused by increased flame temperature in the area of low oxygen and fuel excess region.

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Section: Resultssupporting

confidence: 74%

“…Bahadori et al attempted to understand the effect of gravity on soot formation by both experimental and theoretical means [3,4]. However, they only observed the soot formation in still air with and without gravity.…”

Section: Introductionmentioning

confidence: 99%