Abstract
Interaction effects with special attention on staged ignition phenomena between two self igniting n-decane fuel spheres were studied in microgravity conditions and compared to single droplet results. All combustion experiments were done at the 4.7s Drop Tower Bremen and were performed with a fixed droplet size of 1.5mm, varying mid spacings and ambient temperatures and pressures up to 15bar. The work was done to support the development of numerical models for fuel spray auto ignition. A new technique, based upon chemiluminescence was applied to visualize staged ignition phenomena. chemically excited formaldehyde (CH2O*) was used as a excellent natural tracer for low temperature reactions. According to the experimental requirements an intensified camera (ICCD) concept was developed, so that the real weak chemiluminescence signals become detectable with a sufficient quantum of efficiency. For diagnostics evaluation data derived from chemiluminescence monitoring were compared with those from planar laser induced fluorescence (LIF) of formaldehyde excited at 352.2nm by means of an XeF-Excimer Laser.
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Bolik, T., König, J., Eigenbrod, C. et al. Experimental study of pre-ignition phenomena of self igniting fuel droplets observed by a new diagnostic method. Microgravity sci. Technol. 13, 14–19 (2001). https://doi.org/10.1007/BF02873326
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DOI: https://doi.org/10.1007/BF02873326