B101 EFFECTS OF REDUCED GRAVITY ON HIGH-PRESSURE SINGLE-DROPLET COMBUSTION(Droplet/particle combustion-1)

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An experimental study was conducted on combustion processes of single fuel droplets at high pressures under microgravity conditions which were available in drop shafts and during the parabolic flight of airplanes. Dependence of burning characteristics both on ambient pressure and on gravitational acceleration was examined. Both ignition delay and droplet lifetime of 1-octadecanol droplets had a minimum at an ambient pressure near to the critical pressure of the fuel. Burning rate constant of methanol droplets increased monotonically with increasing ambient pressure up to 1.4 times the critical pressure of the fuel. The ignition delay was not affected by residual reduced gravity. Residual gravitational acceleration of the order of 10^<-2>g_0 induced an appreciable influence both on the droplet lifetime and on the burning rate constant. The burning rate constant decreased with decreasing gravitational acceleration. Variation of burning rate constant as Gr^<1/4> was confirmed experimentally by varying gravitational acceleration and ambient pressure.
2000-10-01