Combustion processes under microgravity conditions

Abstract

A classification of combustion processes is presented which can be used for discussing influences of microgravity. Profound effects of gravity on combustion arise from the large fractional density changes that generally are associated with combustion. Thus it seems to be rather the rule than the exception that combustion experiments under microgravity conditions reveal previously unanticipated phenomena. A few of these phenomena and their theoretical explanations are presented here. Particular attention is devoted to flame balls and to alcohol droplet combustion. Some accomplishments of these and other microgravity combustion studies are summarized. Finally, combustion topics which appear to hold greatest promise for benefiting from future microgravity experiments are indicated.