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ID:32141709
大小:4.17 MB
页数:62页
时间:2019-01-31
《高超声速磁流体发生器性能-研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、高超声速磁流体发生器性能研究AbstractThefundamentalideaofMHDenergybypassistouseMHDenergyconversionprocessestoextractandbypassaportionoftheintakekineticenergyaroundtheburner.ItispossibletoincreasethefreestreamMachnumberforwhichtheflowremainslowMachnumberandthroughouttheburner,andtheramjetmodecanbesus
2、tainedtomuchhigherflightMachnumbers.Inthisscheme,theinletairmustbeionizedandhavehighelectricalconductivitytoattaineffectiveMHDinteractioninthegenerator.Inthisthesis,theflowcharacteristicsandchemicalnonequilibriumionizationintheMHDgeneratorundermagneticfieldaresimulatednumerically.Firs
3、tofall,threedimensionalMHDfive-equationmodelassociatedwithlowmagneticReynoldsassumptionwasusedtosimulatetheflowphenomenonforarectangularFaradaytypeMHDgeneratorwithsegmentedelectrode,andtheeffectsofloadfactors,intensityofmagneticfieldandthewidthoftheelectrodesontheperformanceofthegener
4、atorwereinvestigated.Theresultsshowedthattheelectricalpowerdensityreachedmaximumwhentheloadingfactorwas0.5,andwiththeloadfactorincreasestheslowingcapacityofthegeneratorwasreduced.Atthemagneticfieldstrengthof8T,electricalconductivitywas20mho/m,500mmlengthofthegeneratorcouldreducedtheMa
5、chnumberfrom6to3below,keepthetemperaturebelow800K,andpowergenerationcouldreachtheamountofmegawatt-scaleofpercubicmeteroftheduct.Secondly,inordertocomprehendtheperformanceofhypersoniccold-airMHDpowergeneratorswithionizationbyelectronbeams,theflowphenomenaofarectangularFaradaytypeMHDgen
6、eratorwithsegmentedelectrodeweresimulatedusingthethreedimensionalMHDfive-equationmodelassociatedwithlowmagneticReynoldsassumptionandasimplemodelofbeam-generatedionization.Theeffectsofpowerspentonionizationontheresultsofionizationwasinvestigated,drawingthenumberdensityofelectronsandele
7、ctricalconductivityformedbytheionizationunderdifferentionizationspent.Theresultsshowedthatelectronbeamswerecapableofgeneratinganadequateconductivityincoldair.Atlast,theperformancesofMHDgeneratorunderdifferentpowerspentonionizationisinvestigatednumerically.Whentheloadingfactoris0.5,ele
8、ctric
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