考慮化學(xué)反應(yīng)強耦合的植被火焰條件下直流間隙多物理場耦合模型

Multi-physical-fieleringStrongCouplingoPUZiheng1,2,ZHANGLong1,2,YEKuan3,ZHOUKai3,Z(1.CollegeofElectricalEngine2.HubeiProvincialEngineeringTechnologandtoaccuratelysimulatethedistributionofchargedparticlesinthegapundertheconditionofvegetatiperestablishesaDCgapmulti-physical-fieldcouplingmodelinwhichthestrongcouplingoconditionofvegetationflameistakenintoaccount.Thekevegetationburningtest.Theeffectsofdifferentpolarityvoltagesanofchargedparticlesandtheeffectsofchargedparticlesonthebackgroundelectricfieldareanasimulation.Theresultsshowthat,underthetestconditions,whenthecoefficientofthepyrolysisreactionequationofismodifiedtoC10H14O6→4C+3CO+CO2+2CH4+2H2+H2Oansimulationresultsaretheclosesttothetestresults.Withthedeleakagecurrent.Theeffectofchargedparticlesontheinitialbackgroundeleerthanthatofthenegativeelectrode.Theincreasementofthebackgroundelec70%~110%,andtheincreasementofthebackgroundelectricfieldnearthenegativeelectrodeis4Keywords：DCvoltage;vegetationburning;chargedparticle;ProjectsupportedbyNationalNatura(51607103).物等[5-10]。其中，植被燃燒的化學(xué)電離、熱電離效普子恒，張隆，葉寬，等：考慮化學(xué)反應(yīng)強耦合的植被火焰條件下直流間隙多物理場耦合模型5371基于化學(xué)反應(yīng)的植被燃燒多物理場仿真植被燃燒過程包括植被熱解氣體的擴散和氧Fig.1Couplingrelationofmultiplephysica538影響的重整化群(renormalizationgroup，RNG精度，且能準(zhǔn)確描述火焰等旋渦的高速流動狀+ii=αkμeff+Gk+ρε(1)i iGk?C2ερki為空間+?+??2V=?e(5)大量學(xué)者通過對植被的元素構(gòu)成和熱分解產(chǎn)CxHyOz→C,H2O,CO2,CO,CH4,H2,等(6)CH4+2O2→CO2+2H2O(7)CO+0.5O2→CO2(8)H2+0.5O2→H2O(9)CH+O→HCO++e?HCO++H2O→CO+H3O+(11)CaO+CO?Ca++e?+CO2(12)K+CO+O?K++e?+CO2(13)植被燃燒過程中的化學(xué)反應(yīng)速率符合阿倫尼考慮不同植被的熱解產(chǎn)物比例和熱解反應(yīng)速A/s–1Ea/(kJ·mol–1)n–100Table2ArrheniuA/s–1Ea/(kJ·mol–1)n09.03×101500普子恒，張隆，葉寬，等：考慮化學(xué)反應(yīng)強耦合的植被火焰條件下直流間隙多物理場耦合模型539木垛組成，測量裝置包括紅外攝像儀(IR)、可見光此，由木垛上表面15cm處為起點，以15cm為間植被穩(wěn)定燃燒階段各測溫點處的溫度由下至植被燃燒產(chǎn)生的帶電粒子導(dǎo)致間隙更容易形Fig.2LayoutofexperimentalFig.3Settingoftemperaturemeasurin正負(fù)正負(fù)正負(fù)正負(fù)540本文考慮火焰體和棒電極產(chǎn)生的背景電場均度在100~300s時穩(wěn)定在700~800℃;熱解反應(yīng)方比可知：植被熱解方程為式(15)時，模型中松木燃應(yīng)方程為式(16)時的溫度相對試驗結(jié)果偏低，而植Fig.4GeometryofsimuTable4Reaction1C10H14O6→4C+3CO+CO2+2CH4+2H2+H2O2C6H10O5→2C+2CO+CO2+CH4+2H2+H2O3C8H14O6→3C+2CO+CO2+2CH4+H2+2H2OC10H14O6→4C+3CO+CO2+2CH的進一步研究，得到設(shè)置松木熱解反應(yīng)速率為2.4×10–8mol/(m3·s)時的仿真結(jié)果與試驗結(jié)果最相普子恒，張隆，葉寬，等：考慮化學(xué)反應(yīng)強耦合的植被火焰條件下直流間隙多物理場耦合模型541Fig.5EffectsofdifferentvegetatiFig.6Effectofdifferentpyrolys此對不同工況下間隙內(nèi)的H3O+和電子濃度進行計542極附近與電極極性相異的帶電粒子濃度由10–11Fig.8DistributionofchargedparticFig.9DistributionofchargedparticFig.10Averageconcentr普子恒，張隆，葉寬，等：考慮化學(xué)反應(yīng)強耦合的植被火焰條件下直流間隙多物理場耦合模型54340%。隨著電極高度的降低，燃燒產(chǎn)生的帶電粒子本文建立了考慮化學(xué)反應(yīng)強耦合的植被火焰1）植被的熱解反應(yīng)方程和反應(yīng)速率是模型的關(guān)鍵參數(shù)。燃料為松木時，熱解反應(yīng)方程表示為下的泄漏電流約為–20、–30kV直流電壓時的Fig.11DistortioneffectofcomFig.12Averagevalueofele3）植被燃燒產(chǎn)生的帶電粒子會對背景電場產(chǎn)strategyforkeyregionalpowergri544plicationofextinguishingagentdroptestustransmissionlines[J].HighVoltageassessmentofwildfire-inducedtripsintransmissionlineanalysisof220kVandabovepowertransmiince-levelpowergrid[J].Highdowncharacteristicsofrod-planegapwithfloatingnismofmodelACtransmissionlineunderforesfire[J].ProceedingsofTellusB:Chemicaland[10]祝賀，劉程.gapunderforestfireconwildfiredisaster[D].Guangzhou,China:Guangdongwire-plateelectrostati[13]MPHALEK,HERONM.Measurembiomassfire[J].InternationalJournalofbreakdownof500kVtransmissionlineintermsomechanism[J].ProceedingsofthvoltagebreakdowncharacteristicsofgapunderfireconditioProceedingsoftheCSEE,2014,34(3):453-459.CHENHaixiang.Physico-chemicaandrelevantanalysismethods[D].Hefei,China:UnivticsofCH4/airpremixedflameundertheeffectofDCelectricfield[J].JournalofXi’anJiaotongUniversity,2020,fJournalofXi’anJiaotong[20]張灝，高忠權(quán)，高煦堯，等analysisontheioncurrentflame[J].JournalofXi’anJcharacteristicsofcombufieldcoupling[C]//ProceeElectricalMaterialsandPowerEquipme