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简介：Alowpoweratmosphericpressureplasmajetdrivenbya24kHzACpowersourceandoperatedwithaCH4/airgasmixturehasbeeninvestigatedbyopticalemissionspectrometer.Theplasmaparametersincludingtheelectronexcitationtemperature,vibrationaltemperatureandrotationaltemperatureoftheplasmajetatdifferentdischargepowersarediagnosedbasedontheassumptionthatthekineticenergyofthespeciesobeystheBoltzmanndistribution.TheelectrondensityatdifferentpowerisalsoinvestigatedbyHβStarkbroadening.Theresultsshowthattheplasmasourceworksundernon-equilibriumconditions.Itisalsofoundthatthevibrationaltemperatureandrotationaltemperatureincreasewithdischargepower,whereastheelectronexcitationtemperatureseemstohaveadownwardtrend.Theelectrondensityincreasesfrom0.8×1021m-3to1.1×1021m-3whenthedischargepowerincreasesfrom53Wto94W.

简介：在有各种各样的扎根的电极安排的Ar的一口气压血浆喷气(APPJ)被采用在APPJ的特征上调查电极安排的效果。电、光的方法被用来描绘血浆性质。分别地，关于应用电压的APPJ的分泌物模式为10公里，40公里和80公里的扎根的电极位置被学习，主要分泌物和血浆参数被调查。在扎根的电极和高电压的电极之间的远处的增加在分泌物模式和分泌物参数导致一个变化，这被显示出。从让二解除模式，绝缘的障碍分泌物(DBD)和喷气的分泌物运输到有三，日冕，DBD和喷气，随远处从的增加扎根了到高电压的电极。APPJ的最大的长度在8kV的应用电压到达3.8厘米。分泌物力量和转移费用并且光谱为在APPJ的种类的线紧张被扎根的电极的位置影响，当在电子的价值没有明显的差别时，为三的激动的温度(EET)扎根了电极位置。

简介：Ageneratoroftheglidingarcjet(GAJ),whichisdrivenbyatransversemagneticfield,isdevelopedtoproducenon-equilibriumplasmaatatmosphericpressure.ThegastemperatureisestimatedusingthespectrumofOHradicalstobeabout2400±400K.Thedeterminationsofelectrontemperatureandelectrondensitybyusingaline-ratiomethodareelaboratedfortheglidingarcjetplasma.Thisline-ratiomethodisbasedonacollisional-radiativemodel.Theexperimentresultsshowthatelectrontemperatureisabout1.0eVandelectrondensityisabout6.9×1014cm-3.Obviously,theplasmaofGAJisinanon-equilibriumstate.

简介：Adirect-currentairplasmajetoperatedunderwaterpresentsthreestablemodesincludinganintermittently-pulseddischarge,aperiodically-pulseddischargeandacontinuousdischargewithincreasingthepowervoltage.Thethreedischargemodeshavedifferentappearancesfortheplasmaplumes.Moreover,gapvoltage-currentcharacteristicsindicatethatthecontinuousdischargeisinanormalglowregime.Spectrallinesfromreactivespecies(OH,N_2,N_2~+,H_α,andO)havebeenrevealedintheemissionspectrumoftheplasmajetoperatedunderwater.SpectralintensitiesemittedfromOHradicalandoxygenatomincreasewithincreasingthepowervoltageorthegasflowrate,indicatingthatreactivespeciesareabundant.Thesereactivespeciescausethedegradationofthemethylenebluedyeinsolution.Effectsoftheexperimentalparameterssuchasthepowervoltage,thegasflowrateandthetreatmenttimeareinvestigatedonthedegradationefficiency.Resultsindicatethatthedegradationefficiencyincreaseswithincreasingthepowervoltage,thegasflowrateorthetreatmenttime.Comparedwithdegradationintheintermittently-pulsedmodeortheperiodically-pulsedone,itismoreefficientinthecontinuousmode,reaching98%after21mintreatment.

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简介：Inthisresearch,thenonlinearevolutionofjet-likespikesinthesingle-modeablativeRayleigh-Taylorinstability(ARTI)inthepresenceofpreheating,isstudiednumerically.Itisdemonstratedthatthepreheatingplaysanessentialroleintheformationofjet-likespikesinthenonlinearARTI.Theevolutionofjet-likespikesintheARTIwithpreheatingconsistsofthreestageswithdistinctlydifferentdistinguishingfeatures.Intheearlystage,thepreheatingcontributestosignificantlyincreasethedensity-gradientscalelengthandbroadenthevelocityprofileoftheablationsurface,wheretheformercanreducethelineargrowthoftheARTIandmitigatethegrowthofitsharmonics.Inthemiddlestage,theablativeKelvin-Helmholtzinstabilityisdramaticallysuppressedduetotheablationeffects.Inthelatestage,thejet’slength(i.e.bubble-spikeamplitude)isfurtherincreasedbythebubbleaccelerationinthehighlynonlinearARTI,resultingeventuallyintheformationofjet-likespikes.

简介：Anatmospheric-pressureargonplasmajetwithscrewring-ringelectrodesinsurfacedielectricbarrierdischargeisgeneratedbyasinusoidalexcitationvoltageat8kHz.Thedischargecharacteristics,suchasrotationalandvibrationaltemperatureofnitrogen,electronicexcitationtemperature,oxygenatomicdensity,nitrogenmoleculardensity,andaverageelectrondensity,areestimated.Itisfoundthattherotationaltemperatureofnitrogenisintherangeof352～392KbycomparingthesimulatedspectrumwiththemeasuredspectrumattheC3Πu→B3Πg(△ν=2)bandtransition,theelectronicexcitationtemperatureisfoundtobeintherangeof3127～3230KbyusingtheBoltzmannplotmethod,theoxygenatomicandnitrogenmoleculardensityareoftheorderofmagnitudeof1016cm-3bytheactinometrymethod,andtheaverageelectrondensityisoftheorderofmagnitudeof1012cm-3bytheenergybalanceequation.Besides,theeffectivepower,conduction,anddisplacementcurrentaremeasuredduringthedischarge.