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• W2000678264 endingPage "1972" @default.
• W2000678264 startingPage "1965" @default.
• W2000678264 abstract "The laminar smoke-point properties of non-buoyant round laminar jet diffusion flames were studied emphasizing results from long-duration (100–230 s) experiments at microgravity carried out in orbit aboard the space shuttle Columbia. Experimental conditions included ethylene- and propane-fueled flames burning in still air at an ambient temperature of 300 K, pressures of 35–130 kPa, jet exit diameters of 1.6 and 2.7 mm, jet exit velocities of 170–690 mm/s, jet exit Reynolds numbers of 46–172, characteristic flame residence times of 40–302 ms, and luminous flame lengths of 15–63 mm. Contrary to the normal-gravity laminar smoke point, in microgravity, the onset of laminar smoke-point conditions involved two flame configurations: closed-tip flames with soot emissions along the flame axis and open-tip flames with soot emissions from an annular ring about the flame axis. Open-tip flames were observed at large characteristic flame residence times with the onset of soot emissions associated with radiative quenching near the flame tip: nevertheless, unified correlations of laminar smoke-point properties were obtained that in cluded both flame configurations. Flame Lengths at laminar smoke-point conditions were well correlated in terms of a corrected fuel flow rate suggested by a simplified analysis of flame shape. The present steady and non-buoyant flames emitted soot more readily than non-buoyant flames in earlier tests using ground-based microgravity facilities and than buoyant flames at normal gravity, as a result of reduced effects of unsteadiness, flame disturbances, and buoyant motion. For example, present measurements of laminar smokepoint flame lengths at comparable conditions were up to 2.3 times shorter than ground-based microgravity measurements and up to 6.4 times shorter than buoyant flame measurements. Finally, present laminar smoke-point flame lengths were roughly inversely proportional to pressure to a degree that is a somewhat smaller than observed during earlier tests both at microgravity (using ground-based facilities) and at normal gravity." @default.
• W2000678264 created "2016-06-24" @default.
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• W2000678264 date "2000-01-01" @default.
• W2000678264 modified "2023-10-02" @default.
• W2000678264 title "Smoke-point properties of non-buoyant round laminar jet diffusion flames" @default.
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• W2000678264 doi "https://doi.org/10.1016/s0082-0784(00)80602-5" @default.
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