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    25 October 2017, Volume 37 Issue 5 Previous Issue    Next Issue
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    Electromagneticpropertiesanalysisonsuperconductingmagnetcoilformagnetoplasmadymamicthruster
    YAO Lu, YANG Wen-Jiang, ZHANG Tao, WANG Bao-Jun, TANG Hai-Bin
    2017, 37 (5):  1.  doi: 10.16708/j.cnki.1000-758X.2017.0069
    Abstract ( 580 )   PDF (9203KB) ( 362 )   Save
    Inengineeringapplications,thetraditionalwatercooledcoppermagnetcoilsprovidingappliedfieldhavemanydefectssuchaslargevolume,bigmassandhighpowerdissipation,sotheapplicationoftinyvolumeandsmallmasshightemperaturesuperconductor(HTS)coilsonappliedfieldmagnetoplasmadynamicthruster(AFMPDT)isfocusedon.AnHTScoilbyBi2333/Agwasdesignedtosatisfythedemandof02Tcentermagneticfieldstrengthwhichconsistsofthreedoublepancakecoils.TheHTScoilis30mminheight,witha160mminnerdiameter.Tostudytheelectromagneticpropertiesofthecoil, acriticalcurrenttestingsystemwasbuiltbasedontheprincipleofelectrictransportmethod.TheexperimentalresultsshowthatdifferentpancakeshavedifferentcriticalcurrentIC,andmiddlepancakehasthehighestICvalue.Theironplateshavepositiveinfluenceonthecoilelectromagneticproperties,andcanimproveICvalueby42%.Meanwhile,usingelectromagneticsimulationmethod,theeffectofironplatessizeandpositionontheperformancesoftheHTScoilwasresearched,andanoptimizeddesignwassummarized.
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    Studyontheinfluenceofcathodeandanodepropellantmassflowratesonappliedfieldmagnetoplasmadynamicthrusterperformance
    LI Ze-Feng, TANG Hai-Bin, WANG Bao-Jun, YANG Wen-Jiang, WEN Peng-Fei
    2017, 37 (5):  9.  doi: 10.16708/j.cnki.1000-758X.2017.0078
    Abstract ( 423 )   PDF (9292KB) ( 411 )   Save
    Theeffectsofcathodeandanodepropellantmassflowratesonappliedfieldmagnetoplasmadynamicthruster(AFMPDT)performancewerestudied.Theplumeparametersandthrusterworkingparametersincludingdischargevoltage,dischargecurrentandappliedmagneticfieldweremeasured,andperformanceparametersincludingthrust,specificimpulseandefficiencywerecalculated.Bychangingtheproportionofanodeandcathodegassupply,theinfluenceofinitialgasdistributionontheperformanceandphysicalmechanismofthe〖JP2〗thrusterwasanalyzed.Theresultsshowthatboththrustandefficiencyincreasewiththeproportionofcathodegassupply,butwhenitincreasestoacertainpercentagethethrusterperformancedeclinesduetoinstability,whichindicatestheexistenceofthebestproportionofanodeandcathodegassupplyanditssignificantinfluenceonthrusterperformance.
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    Designofanelectromagneticpropellerfordeepspacemissions
    SHI Xing-Jian, SUN Ke-Xin, ZHU Zhu, SUN Kai-Peng, LIAO He
    2017, 37 (5):  17.  doi: 10.16708/j.cnki.1000-758X.2017.0073
    Abstract ( 460 )   PDF (2561KB) ( 543 )   Save
    Tosolvethemassivepropellantproblemfordeepspacemissions,theconceptofanelectromagneticpropellerwasproposed.Theinterstellarplasmawasusedaspropellant,andtheelectricdrifteffectwithorthogonalanduniformelectricfieldandmagneticfieldwasusedtoproducethethrust.Dependingontheplasmadriftvelocity,theformulaoftheelectromagneticpropellerwasderivedinthenonrelativisticcaseandtherelativisticcase.Therestrictionofelectromagneticpropellerdesignwasanalyzed.Theelectromagneticpropellerschemeanddemonstrationexperimentsweredesignedfordeepspaceanddragfreecontrolmissionswithpracticalengineeringlevel.Astheresultofcalculation,carryingnopropellant,theelectromagneticpropellerdesigncouldobtain1056m/sspeedincrementperyearontheinterstellartravel.
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    Elementarystudyonthedischargeprocessandperformanceofmicropulsedplasmathruster
    WANG Shang-Min, TIAN Li-Cheng, ZHANG Jia-Liang, ZHANG Tian-Ping, FENG Wei-Wei, CHEN Xin-Wei, GAO Jun
    2017, 37 (5):  24.  doi: 10.16708/j.cnki.1000-758X.2017.0080
    Abstract ( 519 )   PDF (5920KB) ( 757 )   Save
    Thedischargeprocess〖JP+2〗andperformancecharacterizationofaplanarablationmicropulsedplasmathruster(〖WT〗μ〖WTF2〗PPT) 〖HJ5.5p〗 wereinvestigated.Basedontheelectricalmeasurementsofthedischargeprocessandopticalbehavioroftheplasmaregion,thebasicdischargecharacteristicsandtheevolutionofthedischargepatternofμPPTwerestudied.Fromthespatialpattern,μPPTdischargegapcanbedividedintothreeregions(cathoderegion,arccolumnregionandanoderegion);withthedischargegapdecreasing,theanodeareagraduallydisappears.Fromthetemporalbehavior,μPPTiscomposedofseveralpulsedischargeswithdifferentamplitude.Thenumberofdischargepulsesisdeterminedbytheimpedancedetailofthedischargecircuitanddischargegap.Singlepulsedischargecanoccurundersuitableconditions.BasedonthecurrentsheetmodeloftheμPPTplasmaregion,thebasicperformanceparameterssuchasimpulsebitandspecificimpulseofμPPTwereestimated.TheresultsshowthatthedischargegapandablationvolumehaveanimportanteffectontheμPPTperformanceparameters.Withsamedischargeenergypulse,thelargerthegapis,thelargertheimpulsebitis,leadingtolargerablationamountandsmallerspecificimpulse.DischargetimespacemorphologyisthekeyfactorthataffectstheimpulsebitandspecificimpulseofμPPT.Therefore,itisaneffectivewaytoimprovetheμPPTperformancebystudyingtheoptimizationofdischargecircuitanddischargegapimpedance.
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    Astudyonformationmechanismofmicrostandingwavesbasedonultrasonicelectrospraypropulsion
    HE Wei-Guo, KANG Xiao-Ming, HANG Guan-Rong, ZHANG Yan, GUO Deng-Shuai, LIU Xin-Yu
    2017, 37 (5):  33.  doi: 10.16708/j.cnki.1000-758X.2017.0077
    Abstract ( 456 )   PDF (6339KB) ( 667 )   Save
    Theformationmechanismofultrasonicstandingwaveswasinvestigatedthroughtheoreticalstudyandexperiments.Theformationofmicrostandingwaveswasobservedbymicroscope;atthesametime,thetheoreticalandexperimentalvaluesofthewavelengthwereanalyzedatdifferentfrequencies.Theinfluencesofvibrationfrequencyonthewavelengthofstandingwavesandtheamplituderequiredtoformthestandingwavewerestudiedwhenemployingdifferentpropellants.Theresultsshowthattheoreticalandexperimentalvaluesofthewavelengthofstandingwavesareingoodagreement.Thewavelengthandamplitudeofthestandingwavesdecreasewiththeincreaseofthevibrationfrequency.Whentheviscosityofthepropellantislarger,theamplituderequiredtoformastandingwaveisgreater.
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    Investigationonthemethodofimprovingtheperformance
    LIU Chen-Guang, NING Zhong-Xi, MENG Tian-Hang, HAN Xing, YU Da-Ren
    2017, 37 (5):  40.  doi: 10.16708/j.cnki.1000-758X.2017.0079
    Abstract ( 502 )   PDF (7833KB) ( 429 )   Save
    Toimprovetheperformanceofthehollowcathodeasathruster,ahollowcathodethrusterwithanemittermountedonthetopofthekeeperwasdeveloped.Itisfoundthatthethrustandspecificimpulsegeneratedbyhollowcathodewiththeouteremitterarehigherthanthoseproducedbyhollowcathode.Afurtherstudyshowsthattheioncurrentandionenergyinhollowcathodewithanouteremitterarebothhigherthanthoseinhollowcathode,anditinfersthatthereexistionsaccelerationinthrustproductionmechanisminhollowcathodethrusterwithanouteremittercausingimprovementsinthrustandspecificimpulse.
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    AmethodofimagediagnosisforinorbitHallthrusterplume
    HU Jun-Feng, YANG Xin-Yong, ZHONG Xiao-Qing, HUANG Tao, WEI Li-Qiu, YU Da-Ren
    2017, 37 (5):  47.  doi: 10.16708/j.cnki.1000-758X.2017.0075
    Abstract ( 507 )   PDF (4321KB) ( 534 )   Save
    AnimagediagnosismethodbasedonthespectrumdiagnosiswasproposedtofacilitatetheinorbitdiagnosismeasurementofHallthrusterplume.Firstly,theRGBdatareflectingthespectralradiationintensityofdifferentwavelengthrangewasextractedfromtheplumeimagephotographedbythecamera.Basedontheanalysisofthecameraimagingprinciple,thecorrespondencebetweentheimagegrayvalueandspectralintensitywasdeduced.Thentheplumeimagediagnosismodelwasestablishedcombinedwiththespectralcollisionradiationmodel.Theexperimentalresultsshowthatthedistributionoftheelectrontemperatureandiondensityintheplumeregioncalculatedbytheimagediagnosismethodisinagreementwiththeresultsoftheprobemeasurement.Therelativeuncertaintyofthecalculatedresultsisabout20%and15%.Itisfurtherprovedthatthediagnosismethod,whichhasmoderateprecisionandhighreliability,issuitablefortheinorbitdiagnosismeasurementofHallthrusterplumeparameters.
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    ResearchonrotatingspokebyusingthecylindricalHallthrustersegmentedanode
    GUI Bing-Yi, TANG De-Li, JIN Fan-Ya, TIAN Xi
    2017, 37 (5):  54.  doi: 10.16708/j.cnki.1000-758X.2017.0076
    Abstract ( 487 )   PDF (6334KB) ( 586 )   Save
    Inordertostudythevariationofrotatingspokefrequencyofthecylindricalhallplasmathrusterinrelatedworkingparameters,andtofindoutthemethodtorestraintherotatingspoke,theannularanodewasdividedintotwoindependentsegments.Bymeasuringtheelectricalsignalbetweenthetwoindependentanodesectionswithdischargevoltage,dischargecurrentanddeliveringrateofpropellantandsoon,thespokephenomenonwasqualitativelyandquantitativelyanalyzed.Theresultsindicatethattherotatingspokefrequencyobservablyincreaseswiththeincreaseofdischargevoltageandpressure.Andthespokerotatingphenomenoninthenearanoderegionisgenerallypresent,eveninhighvoltageconditions.Thefrequencyofrotatingspokeismainly10~45kHz.Theaxialcurrentoscillationaccountsforabout50%ofthetotalcurrentintheisolatedanodesegment.Reducingtheflowofworkingfluidandthedischargevoltageisbeneficialtosuppressrotatingspoke
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    Magneticfieldcharacteristicsanalysisandoptimizationdesignof30cmxenonionthruster
    HU Jing, WANG Liang, ZHANG Tian-Ping, JIANG Hao-Cheng
    2017, 37 (5):  60.  doi: 10.16708/j.cnki.1000-758X.2017.0068
    Abstract ( 462 )   PDF (2760KB) ( 607 )   Save
    Themagneticfielddesigndirectlyinfluencesthestabilityandtheinorbitlifeofthedischargechamber.Aimingatthecomplexityofthe30cmxenonionthrustermagneticfielddesigninvarietyofoperatingmodes,themagneticcircuitcharacteristicswasanalyzedduringtheconversionbetweentheelectromagnetandpermanentmagnet.Andthekeyparametersofthepermanentmagnetwereoptimized.Themagneticcircuitmodelofthe30cmxenonionthrusterwasestablished,combinedwiththefiniteelementmethod,theeffectivenessandfeasiblityofthismethodwasvalidatedbycomparedwiththejobsitedata.Basedonthismodel,thekeyparametersofthepermanentmagnetwhichcouldproducerequestedmagneticinductionintensitywereobtained.Thenthekeyparametersofthepermanentmagnetwereoptimizedbyusingmultiobjectiveparticleswarmoptimization(MPSO)algorithm,withthegoaloftheminimumanodeshockvoltage,acceleratorgridcurrent,deceleratorgridcurrentandmagneticcircuitsystemweightsystem,andtherelevantoptimalresultofmagneticcircuitconfigurationfor30cmxenonionthrusterwasobserved.Aboveresearchwillcertainlyprovideamethodforthedesignandoptimizationoftheionthruster.
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    Successiveoverrelaxationparallelalgorithmforsolvingcomplexelectricfieldinelectricthrusters
    HAN Ya-Jie, XIA Guang-Qing, WU Qiu-Yun, CHEN Liu-Wei, ZHOU Nian-Dong, WEN Zheng
    2017, 37 (5):  68.  doi: 10.16708/j.cnki.1000-758X.2017.0074
    Abstract ( 481 )   PDF (2992KB) ( 574 )   Save
    Atpresent,solvingthethreedimensionalPoissonequationofcomplexelectricfieldintheelectricthrusterstillhasthedisadvantagesofslownessandpoorparallelism.
    Asuccessiveoverrelaxationparallel(PSOR)iterativealgorithmwasproposedtosolvethethreedimensionalPoissonequationbasedontheideaofdomaindecomposition.Thesolutionregionwasdividedintoseveralsubdomains.AndanumberofexplicitschemeswereconstructedbyusingtheSORmethod.Thenaccordingtothedifferentschemes,thesolvingequationsfordifferentiterativestepsweregivenforparallelcomputation.Thenumericalsimulationresultsshowthatthecalculationtimeisreducedbyatleasthalf.AndthePSORmethodhasmadegreatprogressinthecomputationspeedcomparedwiththetraditionaliterativescheme.
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    Simulationresearchonoscillationcharacteristicinhighefficiencymultiplasmathruster
    NIU Xiang, WU Huan, LIU Hui, YU Da-Ren
    2017, 37 (5):  75.  doi: 10.16708/j.cnki.1000-758X.2017.0072
    Abstract ( 412 )   PDF (6010KB) ( 532 )   Save
    Nowthemainnumericalsimulationmethodofhighefficiencymultiplasmathruster(HEMPT)isparticleincell.Butthismethodputshigherdemandsoncomputer.Therefore,thismethodaimsatreappearingtheoscillationphenomenoninhighefficiencymultiplasmathrusterbybuildinguponedimensionfluidmodelandstudyingtheplasmaparametersdistributionandtherelationshipbetweenthecurrentandplasmaparameters.AonedimensionfluidmodelwasbuiltupalongtwodistinguishingtypicalelectronpathsinthrustersbySimulink.Thesimulationresultsshowthattheplasmaparametersoscillationperiodisconsistentwiththatofthecurrent.Themainionizationzoneisbetweenthetwocuspedfields.Themainareawherepotentialdropsisnearthechannelexit.  
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    Particleincellsimulationofacoaxialmicrocathodearcthruster
    XIONG Zi-Chang, GENG Jin-Yue, CHEN Xuan, WANG Hai-Xing
    2017, 37 (5):  81.  doi: 10.16708/j.cnki.1000-758X.2017.0081
    Abstract ( 603 )   PDF (9622KB) ( 401 )   Save
    Amodelingstudywasperformedtoinvestigatetheworkingprocessofacoaxialmicrocathodearcthrusterwithparticleincell(PIC)method,andtheselfsimilarmethodwasappliedtosimplifythesimulationmodel.Thedistributionofelectronnumberdensity,ionnumberdensity,electricpotentialandaxialaverageionvelocityinthethrusterplumeregionwasobtained.Theinfluencesofmagneticfieldonplasmamotioncharacteristicsandthrusterperformancewerestudiedbychangingmagneticfluxdensityandmagneticfieldtopology.Theresultsshowthatelectronsareconstrainedbytheappliedmagneticfield,cyclingaroundmagneticfieldlines,andthationsareacceleratedbytheambipolardiffusionelectricfieldproducedbyslowerionsandfasterelectrons.Withthesamemassflowrate,theionrefluxisseverewhenthemagneticfluxdensityis002T,whiletheionvelocityislessaffectedbythemagneticfluxdensitywhenthemagneticfluxdensityis005~030T.Magneticfieldtopologyhasgreatinfluenceontheionmotionandthrusterperformance.Theionvelocitydecreasesobviouslywhentheanglebetweentheaxisandmagneticfieldlinesissmall,whiletheionrefluxisseverewhentheangleislarge.
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