Abstract
The luminous shapes were presented to examine the scaling of flame heights and widths of laminar jet diffusion flames of burning methane, ethylene, and propane in a subatmospheric pressure chamber. All the flames examined were stable with no soot emitting. The Reynolds scaling mentioned below was generally suitable for the three hydrocarbon fuels although slopes were becoming steeper as soot formation elongated the flame height at high Re under high pressure. The regions of Froude number where buoyancy is dominant or buoyancy is unimportant were demonstrated by following Reynolds–Froude height scaling of Altenkirch’s model. In Froude scaling of width, the unchanged slopes between dimensionless width and Fr with pressure increase indicated the good linearity of flame width changing on pressure. Finally, regression of the form for flame width was also considered.
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