Influence of moisture on autoignition of woods in cone calorimeter 英文文献资料

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1、ArticleJournalofFireSciencesInfluenceofmoistureon30(2)158–169ÓTheAuthor(s)2012autoignitionofwoodsinconeReprintsandpermissions:sagepub.co.uk/journalsPermissions.navcalorimeterDOI:10.1177/0734904111431675jfs.sagepub.comLongShiandMichaelYitLinChewDatereceived:6October2011AbstractSixspecie

2、sofwoodsamples,namely,pine,beech,cherry,oak,maple,andash,wereinvestigatedbyautoignitioninaconecalorimetertoidentifytheinfluenceofmoistureonautoignition.Itwasobservedthat(1)forautoignition,asdifferentfrompilotedignition,thereisnoobvioustrendinignitiontemperaturewhenmoisturecontentincrea

3、sesfrom0%to11%;(2)ignitiontemperaturedecreaseswithahigherexternalheatflux,andtheinfluenceofspecimenthicknesstotheignitiontemperaturecanbeignored;(3)ignitiontimecorrelateslinearlywithr0:73=(q_0028:0)1:82,andthecoefficientriseswiththeincreaseofmoisturecontent;and(4)theinfluenceofmoistur

4、etotheaveragemasslossrateandtimeat50%masslosscanbeignoredifthemoisturecontentofwoodsampleislowerthan11%.KeywordsWood,moisturecontent,autoignition,ignitiontemperature,ignitiontime,masslossrateIntroduction1Ignitiontendstomeantwodifferentthings:(1)kindledignitionwhereabodyisignitedbyanext

5、ernalheatsource,suchasflame,sparks,orhotsurface,andingeneral,themeasure-mentofignitionpointbasedontheAmericanSocietyforTestingandMaterials(ASTM)iswidelyused;and(2)autoignition(orself-ignition,spontaneousignition,nonflamingigni-tion)wherecertaincombustiblematerialscanigniteasaresultofin

6、ternalheating,whicharisesspontaneouslyifthereisanexothermicprocessliberatingheatfasterthanitcanbelosttothesurrounding.MostofthepreviousstudiesfocusedonlyonthekindledignitionofDepartmentofBuilding,NationalUniversityofSingapore,SingaporeCorrespondingauthor:LongShi,DepartmentofBuilding,Na

7、tionalUniversityofSingapore,Singapore117566.Email:shilong@mail.ustc.edu.cn/shilong@nus.edu.sgShiandChew159Table1.MeasuredpropertiesofwoodsamplesSpeciesMaterialGrainorientationDrywoodWetwoodAveragedensityAveragedensityAveragemoisture33(kg/m)(kg/m)content(%)SoftwoodPineAlong392.7446.81