Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Some considerations of weak blow-out and extinction limits of premixed flames
A flame limit occurs when the liberated heat becomes less than a critical value representing the heat required to balance actual heat losses, chain termination's, and/or the loss of carriers due to third-body or wall collisions. A lot of work has been published with reference to the prediction of flame limits determined in tubes but little, or nothing, is known of the value of the limit temperature. Because of the difficulties of measuring the actual extinction temperature an indirect approach is used in the present work. In the first instance, using wide-diameter tubes (d > 20 mm) the effect of diluents upon flame extinction is determined and by making the assumption that under these conditions the heat loss to the walls is small it then becomes possible to calculate the extinction temperature. These temperatures are then related to the those that would have been obtained from the undiluted mixture and thereby a 'heat loss' is defined. These heat losses are later applied to small tubes in order to define the extinction temperatures. The heat loss theory may then be associated with the blow-out temperatures for well stirred reactors.
Some considerations of weak blow-out and extinction limits of premixed flames
A flame limit occurs when the liberated heat becomes less than a critical value representing the heat required to balance actual heat losses, chain termination's, and/or the loss of carriers due to third-body or wall collisions. A lot of work has been published with reference to the prediction of flame limits determined in tubes but little, or nothing, is known of the value of the limit temperature. Because of the difficulties of measuring the actual extinction temperature an indirect approach is used in the present work. In the first instance, using wide-diameter tubes (d > 20 mm) the effect of diluents upon flame extinction is determined and by making the assumption that under these conditions the heat loss to the walls is small it then becomes possible to calculate the extinction temperature. These temperatures are then related to the those that would have been obtained from the undiluted mixture and thereby a 'heat loss' is defined. These heat losses are later applied to small tubes in order to define the extinction temperatures. The heat loss theory may then be associated with the blow-out temperatures for well stirred reactors.
Some considerations of weak blow-out and extinction limits of premixed flames
Einige Betrachtungen über schwaches Ausblasen und Löschgrenzen von vorgemischten Flammen
Odgers, J. (Autor:in) / Kretschmer, D. (Autor:in)
1995
10 Seiten, 15 Bilder, 5 Tabellen, 23 Quellen
Aufsatz (Konferenz)
Englisch
Flamme , Löschmittel , Wärmeentwicklung , Wärmeverlust , Wärmeträgerflüssigkeit , Vorhersage , Rohr , Messung , Verdünnung , Gemisch , Rührwerk , chemischer Reaktor , Fertigblasen
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