Experimental Investigation of Multi-Phase Combustion with a Modified Cardiff Combustion Bomb

摘要

Explosion hazards related to the release of gaseous fuels have been extensively investigated and are well characterized; however, the consequences associated with liquid release, and in particular two-phase mixtures, are less well understood. To investigate the mechanisms underlying aerosol explosions in order to evaluate this hazard and develop models to quantify and predict the consequences, an experimental apparatus consisting of a cloud chamber/combustor has been tested and benchmarked with pre-vaporized fuels for use with mists. The present work details the cloud chamber and its modifications to support the formation and explosion of mists, the benchmarking made with hexane and ethanol as well as the theory for the extraction of the results. Some limitations of this method are discussed as well. In the last part, some commissioning results are presented along with some results for methanol and ethanol mist flames. For methanol, the maximum flame speed that can be sustained as a mist seems to be dependant on the Sauter Mean Diameter of the droplets while for ethanol, the droplet size does not modify the flame speed.