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时间:2020-03-27
《煤油自点火特性的实验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学~E(WuliHuaxueXuebao)AprilActaehys.一Chim..2012,28(4),787-791787[Article]doi:10.3866/PKU.WHXB201202161WWW.whxb.pku.edu.cn煤油自点火特性的实验研究唐洪昌’张昌华李萍’王利东’叶彬李象远(四川大学原子与分子物理研究所,成都610065;I~t)rl大学化学工程学院,成都610065)摘要:在加热激波管中利用反射激波点火,采用壁端压力和CH‘发射光作为点火指示信号,测量了气相煤油,空气
2、混合物的点火延时,点火温度为1100—1500K,压力为2.O×10。和4.0x10Pa,化学计量LL(O)为0.2、1.0和2_0_分析了点火温度、压力和化学计量比对点火延时的影响.结果显示,化学计量比为1.0和2.0时活化能几乎是相同的,但与化学计量比为0.2时的活化能差异很大,拟合得到了不同化学计量比条件下点火延时随温度变化的关系式.点火延时与已有的动力学机理进行对比,实验结果与Honnet等人的动力学机理吻合得很好.对不同化学计量比条件下的反应进行了敏感度分析,结果表明在化学计量比为0.2时,对点
3、火延时敏感的关键反应与化学计量比为1.0时的有很大差异.关键词:点火延时;煤油:加热激波管:敏感度分析:动力学机理中图分类号:0643ExperimentalStudyofAutoignitionCharaCteristjcsofKeroseneTANGHong—Chang’ZHANGChang-Hua’tLIPing’WANGLi—Dong’YEBin’LIXiang—YuanInstituteofAtomicandMolecularPSics.SichuanUniversity,Chengdu6100
4、65,PR.China;CollegeofChemicalEngineering,SichuanUniversity,Chengdu610065,PR.China)Abstract:Theignitiondelaytimesofgas—phasekerosene/airmixturesweremeasuredbehindretie}ctedshockwaves.usingside.walIpressureandCH’emissionmeasurementsinaheatedshocktube.Theexp
5、erimentswereperformedoverthetemperaturerangeof1100-1500K.atpressuresof2.0x10and4.0x10Pa,andforequivalenceratios()of0.2,1.0,and2.0.Theeffectsoftemperature,pressure,andequivalenceratioontheignitiondelaytimewereinvestigated.Theglobalactivationenergyforkerose
6、ne/airvariessignificantlywhentheequivalenceratiochangesfr0m0_2tO1.0.whereastheglobaIactivationenergyatanequivalenceratioof1.0iSalmostthesameasthatat2.0.Threecorrelationsfortheignitiondelaytimeunderthreediferentequivalenceratioswerededuced.Thecurrentdatawe
7、recomparedwithavailablekineticmechanisms.andwerefoundtobeingoodagreementwiththepredictionsofHonneteta1.Chemicalmechanismsensitivityanalysesfordiferentequivalenceratioswereperformed;theresultsshowedthattheignitionsensitivityatanequivalenceratioof0.2iSquite
8、diferentfrOmthoseat1.0and2.0.KeyWords:Ignitiondelaytime;Kerosene;Heatedshocktube;Sensitivityanalysis;Kineticmechanism1IntrOductiOnofkeroseneisimportanttotheprocessofdevelopingmoreefi—Keroseneiswidelyusedtopowercivil
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