Effect of radiation loss on flame spread over a thin PMMA sheet in microgravity

Experimental comparison of opposed and concurrent flame spread in a forced convective microgravity environment

“…Two earlier measurements by Grayson et al [13], although for a slightly different pressure and oxygen level, compare favorably. These results are also consistent with the trends found by Takahashi et al [8] for thin PMMA and Olson et al [11] for thicker cellulose fuel. Unfortunately, in the flow velocity region between À10 and À30 cm/s for 34% O 2 , 10.2 psia, the concurrent flames exhibited unexpected behavior in our drop experiments, as dis- cussed in more detail later, which made it impossible to obtain valid flame spread data in that range.…”

“…In addition, concurrent flames could not survive below forced flows of 2 cm/s whereas the opposed flames were able to survive at 0.5 cm/s, which indicates that the extinction boundary was skewed toward the concurrent side of quiescence. Takahashi et al [8] found a similar result in flows up to 15 cm/s for three different thicknesses of very thin noncharring PMMA at three oxygen concentrations.…”

Behavior of Flame Spread on Thin PMMA near Extinction Limit at Low Oxygen Level

“…We choose nitrogen (N 2 ), helium (He), argon (Ar) and carbon dioxide (CO 2 ) for the diluents to change thermal properties of the ambient gas (see Table 1). The drop experiments were carried out with the wind tunnel that could create arbitrary opposed flow from 0 cm/s to 30 cm/s 7) . The schematic of the wind tunnel is shown in Fig.…”

Flame structure and flame spread rate over a solid fuel in partially premixed atmospheres

“…The phenomena of flame spread are therefore complex process. So far, many studies on the flame spread over inflammable solids have been performed, often using samples such as filter papers and polymethyl methacrylate (PMMA) materials to simulate the flame spread in fire [9][10][11][12][13][14].…”