ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Flashover in compartment fire itself is a catastrophe process. Its catastrophe behavior canbe analyzed, and its topological function equation can also be set up by catastrophe theory. On thebasis of analyzing swallowtail catastrophe characteristic, a flashover model of hot smoke layer,which is established based on energy conservation, is transformed in the dimensionless form firstly,and then diffeomorphism is applied to simplify it. By these transform, a catastrophe potentialfunction is gained. The format of the catastrophe potential function makes it clear that this type offlashover belongs to swallowtail catastrophe. Subsequently, taking passenger carriage fire as anidiographic object, the connection between system control variable and burning condition isdiscussed. The results show that the space of catastrophe bifurcation in muster divide the fire intotwo section, namely flashover section and non-flashover section. If in flashover section, an unstablepoint can be obtained by using qualitative curve or differential coefficient curve of potentialfunction. Furthermore, the temperature of hot smoke layer is calculated by the value of the criticalpoint when flashover occurs. The calculation case of passenger carriage fire shows that thetemperature of hot smoke layer is 625.3°C when flashover occurs in the carriage, which isagreement with real instance
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.1305.pdf
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