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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 ( 1024 )   PDF (9203KB) ( 479 )   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. Related Articles | Metrics

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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 ( 685 )   PDF (9292KB) ( 481 )   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. Related Articles | Metrics

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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 ( 878 )   PDF (2561KB) ( 826 )   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. Related Articles | Metrics

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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 ( 809 )   PDF (5920KB) ( 1042 )   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. Related Articles | Metrics

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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 ( 916 )   PDF (6339KB) ( 966 )   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. Related Articles | Metrics

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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 ( 776 )   PDF (7833KB) ( 563 )   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. Related Articles | Metrics

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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 ( 804 )   PDF (4321KB) ( 925 )   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. Related Articles | Metrics

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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 ( 935 )   PDF (6334KB) ( 835 )   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 Related Articles | Metrics

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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 ( 712 )   PDF (2760KB) ( 1042 )   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. Related Articles | Metrics

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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 ( 694 )   PDF (2992KB) ( 944 )   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. Related Articles | Metrics

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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 ( 680 )   PDF (6010KB) ( 777 )   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.   Related Articles | Metrics

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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 ( 903 )   PDF (9622KB) ( 576 )   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. Related Articles | Metrics