Abstract
The laminar smoke point properties of jet diffusion flames -- the luminous flame length, the residence time, and the fuel flow rate, at the onset of soot emission from the flames -- have proven to be useful global measures of the soot properties of nonpremixed flames. These measures provide a means to rate several aspects of sooting properties: the relative tendency of various fuels to emit soot from flames the relative effects of fuel structure, flame temperature, and pressure on the soot properties of flames and the relative levels of continuum radiation from soot in flames. However, recent studies suggest potential for fundamental differences between the laminar smoke point properties of buoyant and non-buoyant flames. Thus, the overall objective of present investigation was to measure the laminar smoke point properties of nonbuoyant flames, due to their relevance to many industrial processes where effects of buoyancy are small. Prior to this work, no experiments have been reported to assess these potential effects of buoyancy on laminar smoke point properties. Thus, the present objective was to measure the laminar smoke point flame lengths and residence times of nonbuoyant flames. The scope of the study was limited to round ethylene and propane jetmore » diffusion flames burning in slightly vitiated air at pressures of 0.5--2.0 atm. A low-gravity test environment was used to obtain nonbuoyant flames at the small flow velocities characteristic of laminar smoke point conditions.« less
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