Soot properties of laminar jet diffusion flames in microgravity

Numerical study of the effects of gravity on soot formation in laminar coflow methane/air diffusion flames under different air stream velocities

“…However, it is observed that in almost all of these experimental studies the jet diffusion flames were generated without the co-flowing air, i.e. the fuel burns in quiescent air [12,13]. An exception to this observation is the study by Lin and Faeth [17], who experimentally and theoretically investigated the effect of the co-flowing air on the shape of non-buoyant laminar diffusion flames generated at reduced pressures.…”

“…Earlier experimental studies focused on the transient behaviour of the flame when it is suddenly subject to 0 g from normal gravity (1 g) using drop tower [3,5,6] and the overall flame shape (diameter, length) and appearance [4,7,8]. More recent experimental investigations at 0 g examined the smoke point properties [9,15,16] and measured soot volume fraction distributions [11][12][13][14][15]. However, it is observed that in almost all of these experimental studies the jet diffusion flames were generated without the co-flowing air, i.e.…”

“…There have been many experimental studies on the structure and sooting behaviour of non-buoyant diffusion flames [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Earlier experimental studies focused on the transient behaviour of the flame when it is suddenly subject to 0 g from normal gravity (1 g) using drop tower [3,5,6] and the overall flame shape (diameter, length) and appearance [4,7,8].…”

Investigations on Soot Formation in Heptane Jet Diffusion Flames by Optical Techniques

“…The data obtained by the experiments are to form a basis for further modeling of soot formation in laminar jet-diffusion flames under non-buoyant conditions. Recent investigations in this context, which underline the importance of microgravity experiments, include the test of soot state relationships and numerical simulations, respectively, (see Diez et al 2009 andKong andLiu 2009 andreferences therein). The data of the present investigations are regarded as particularly helpful for validating numerical models as they provide a coherent twodimensional data set on temperature, soot concentration and-hardly to be obtained by other methodsprimary particle size.…”

“…There have been various studies on soot distribution (e.g., Vander Wal 1997; Konsur et al 1999;Walsh et al 2000;Diez et al 2009) and primary particle size (e.g., Ku et al 1995;Urban et al 1998) in laminar jet diffusion flames under microgravity, but so far particle size has mainly been determined ex-situ by sampling and subsequent TEM analysis.…”