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1、FIRECHARACTERISTICSOFPCMONITORS–PARTII/45Figure1.StructureviewofISO9705room.46/SHIETAL.one-sidedoorwithconstantopeningheight,showninFigure2.Becauseofthelimitationofequipment,theseexperimentscanonlybecarriedoutwhenopeningwidthislessthan0.8m.Theopeningwidthof0.
2、8mseemsenoughtostatetheinfluencesofventilationbecausethisstudyaimstoanalyzefirecharacteristicsofasingleroom.Also,thehood(Figure1)gathersthesmokeescapedfromcombustionroom,andexperimentaldataareobtainedbydetectorinexhaustduct.Soitisimpossibletomeasurethedatawhe
3、nthedoorisclosed.Basedontheseconsiderations,differentopeningwidthsareusedintwotypes:openingwidthsfortypeMare0.2m,0.4m,0.6m,and0.8mrespectively,andfortypeNare0.1m,0.3m,0.5m,and0.7mrespectively.Manykindsofignitionsourceswereusedinfull-scalefireexperiments,sucha
4、smethenaminetablet,candle,isopropanolfuel,propanefire,andsoon[16,17].Outputpower,duration,shape,andrepeatabilitymustbeconsideredwhenchoosingignitionsource.Basedontheaboveconsiderations,acontainerhavingamixtureofethanolanddieseloilischosen.Thecontainerisacylin
5、dricalvesselwithinnerdiameter50mmandheight55mm.Dieseloilisfirsttippedintothevesselto30mmheight,thenethanolfillstherestofthespacetoenkindledieseloil.ItiseasytoknowthatHeatReleaseRate(HRR)ofthisfiresourceishardtoreach1kW.Sotheinfluenceoffiresourcetoexperimental
6、resultsisignoredinthisarticle.Duringtheexperiments,smokespillsthroughthedoorwayandgathersinthehood,thenitispumpedintoanexhaustductbyafan.Thevolumeflowintheexhaustductiscontrolledto3.0m3persecondbythefan.Attheendofexhaustduct,thereisaprobeforgassampling.Afterw
7、ards,smokesampleisanalyzedbyServomex400gasanalyzer.Inaddition,repeatedexperimentsarecarriedoutfortypeMwhenopeningwidthis0.8m.Andthevariationoftheseexperimentsisacceptable.Figure2.Openingwidthsadjustedbyone-sidedoor.48/SHIETAL.Figure3.CombustionphenomenaofM-0.
8、8bytimeincombustionroom.andrealfires,itissuggestedthatthegrowthinHRRduringtheearlystageofafiremayoftenbereasonablyapproximatedbyatimesquared(t2)growthcurveoftheform[20]:Q=(t–t0)2(1)where
