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Preliminary scaling rules are synthesized to relate full-scale compartment fires with small-scale test fires; these rules then are applied to certain full- and quarter-scale model test data of the National Bureau of Standards, focusing on the issue of flashover as influenced by lintel height, initial burning item, and wall linings. The correlation attempt is only partially successful. Data of the tests in which flashover was deemed to have occurred within a finite time correlate in a reasonable fashion. However, test data in which flashover time is noted to be infinity do not obey the scaling hypothesis. The issue of whether or not flashover would occur under a set of prescribed conditions thus seems to be unsettled by this work. The similitude analysis presented here, however, appears to yield the rudiments of a framework within which a synthesis can be made of the experimental observations on the complex phenomenon of room-fire flashover.
flashover, scaling, room fires
Professor, Oregon State University, Corvallis, OR