聚氨酯泡沫材料的陰燃及其向有焰火轉(zhuǎn)化過(guò)程的研究.pdf

1、中國(guó)科學(xué)技術(shù)大學(xué)碩士學(xué)位論文聚氨酯泡沫材料的陰燃及其向有焰火轉(zhuǎn)化過(guò)程的研究姓名：彭磊申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：安全技術(shù)及工程指導(dǎo)教師：周建軍20050501中國(guó)科學(xué)技術(shù)大學(xué)碩士學(xué)位論文摘要AbstractSmolderingcombustionisdefinedasaselfsustaining，propagating，heterogeneousandnon—timingreactionintheporouscombustiblemate

2、rialsThesmolderwillbeignitedwhenexposedtoexteriorheatsourceThentheheatisproducedbytheexothermicoxidationwhichOccursbetweenmaterialsandoxygentosustainthesmolderingpropagationUndersomecertainconditions，itCanleadtotheinitia

3、tionofaflamingfirethroughthetransitionfromsmolderingOncethetransitionoccurstheflamingengulfsthewholematerialsquicklyInthispaper，aseriesofexperimentalstudyonsmolderingcombustionofpolyurethanefoamhasbeenconductedTheresearc

4、hcoverstheinvestigationofsmolderingignitionofpolyurethanefoam，smolderingpropagationundernaturalconvection，forcedforwardandopposedsmolderingpropagationandthetransitionfromsmolderingtoflamingofpolyurethanefoamTheexperiment

5、alstudyonsmolderingignitionofpolyurethanefoamwascarriedouttodeterminetheeffectofextemalheatfluxandtheexposuretimeonthesuccessfulignitionofsmolderingcombustionItisobservedthattheselfsustainedsmoldercouldonlyOCCUrinanexter

6、nalheatfluxbetween～16KW／m2and～68KW／m2Thediggerheatflux，theshorterexposedtimewasneededTheexperimentalresultsshowaminimumdepthofsmolderingpropagation(char)wasrequiredforsuccessfulignitiontooccurwhichwasneededtoprovideheatt

7、ovirginmaterialsandtoreduceheatlossesfromthereactionzoneThedepthofthecharisfoundtobeapproximatelyequalto42cmfromtheexperimentsThiscriticaldepthofcharisalsofoundintheignitionmodelthathasbeendevelopedinthispaperItisshownth

8、at也ehorizontalsmolderonnaturalconvectionisasteadysmolderingpropagationandthespreadrateremainsapproximatelyconstantAndSOistheforcedflowopposedsmolderTheforcedforwardsmolderseemstmsteadyalongthematerialsIncreasingtheairflo