考慮化學(xué)反應(yīng)強(qiáng)耦合的植被火焰條件下直流間隙多物理場(chǎng)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(qiáng)耦合的植被火焰條件下直流間隙多物理場(chǎng)耦合模型5371基于化學(xué)反應(yīng)的植被燃燒多物理場(chǎng)仿真植被燃燒過(guò)程包括植被熱解氣體的擴(kuò)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(dòng)狀+ii=αkμeff+Gk+ρε(1)i iGk?C2ερki為空間+?+??2V=?e(5)大量學(xué)者通過(guò)對(duì)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(guò)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(qiáng)耦合的植被火焰條件下直流間隙多物理場(chǎng)耦合模型539木垛組成，測(cè)量裝置包括紅外攝像儀(IR)、可見(jiàn)光此，由木垛上表面15cm處為起點(diǎn)，以15cm為間植被穩(wěn)定燃燒階段各測(cè)溫點(diǎn)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(chǎng)均度在100~300s時(shí)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(shí)，模型中松木燃應(yīng)方程為式(16)時(shí)的溫度相對(duì)試驗(yàn)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(jìn)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(shí)的仿真結(jié)果與試驗(yàn)結(jié)果最相普子恒，張隆，葉寬，等：考慮化學(xué)反應(yīng)強(qiáng)耦合的植被火焰條件下直流間隙多物理場(chǎng)耦合模型541Fig.5EffectsofdifferentvegetatiFig.6Effectofdifferentpyrolys此對(duì)不同工況下間隙內(nèi)的H3O+和電子濃度進(jìn)行計(jì)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(qiáng)耦合的植被火焰條件下直流間隙多物理場(chǎng)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(qiáng)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(shí)，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(shí)的Fig.11DistortioneffectofcomFig.12Averagevalueofele3）植被燃燒產(chǎn)生的帶電粒子會(huì)對(duì)背景電場(chǎng)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