简介:Theelectric-staticbodyforcemodelisobtainedbysolvingMaxwell’selectromagneticequations.Basedontheelectro-staticmodel,numericalmodelingofflowaroundacylinderwithadielectricbarrierdischarge(DBD)plasmaeffectisalsopresented.Theflowstreamlinesbetweenthenumericalsimulationandtheparticleimagevelocimetry(PIV)experimentareconsistent.Accordingtothenumericalsimulation,DBDplasmacanreducethedragcoefficientandchangethevortexsheddingfrequenciesofflowaroundthecylinder.
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简介:Theexperimentwascarriedoutinacylindricaldielectricbarrierdischarge(DBD)reactorassistedwithacatalysttodecomposetolueneunderdifferenthumidity.Inordertoexplorethesynergisticeffectonremovingtolueneinthecatalysis-DBDreactor,thispaperinvestigatedthedecompositionefficiencyandtheenergyconsumptioninthecatalysis-DBDandthenon-catalystDBDreactorsunderdifferenthumidity.Theresultsshowedthatthecatalysis-DBDreactorhadabetterperformancethanthenon-catalysisoneatthehumidityratioof0.4%,andtheremovalefficiencyoftoluenecouldreach88.6%inthecatalysis-DBDreactor,whileitwasonly59.9%inthenon-catalyticreactor.However,therewasnosignificantdifferenceintheremovalefficiencyoftoluenebetweenthetworeactorswhenthehumiditieswere1.2%and2.4%.Additionally,thedegradationproductswerealsoanalyzedinordertogainabetterunderstandingofthemechanismofdecomposingtolueneinacatalysis-DBDreactor.
简介:Aninvestigationonthedischargecharacteristicofadielectricbarrierdischarge(DBD)devicewascarriedoutusingbareandZnO-coatedaluminadielectriclayerinatmosphericpressureair.HighlyconductiveZnOfilmwasfirstdepositedonthealuminasurface,andthecharacteristicsofthedielectricbarrierdischargewereexaminedandcompared.ExperimentalresultshowsthatdischargebehaviorwasdefinitelyimprovedinthecaseofZnO-coateddielectricbarrierdischarge.Relevantexplanationisofferedtodescribeitsdischargephysics.
简介:Inthisstudy,SiO_xfilmsweredepositedbyadielectricbarrierdischarge(DBD)plasmagunatanatmosphericpressure.TherelationshipofthefilmstructureswithplasmapowerswasinvestigatedbyFouriertransforminfraredspectroscopy(FTIR),andscanningelectronmicroscope(SEM).Itwasshownthatanuniformandcross-linkingstructurefilmwasformedbytheDBDgun.Asanapplication,theSiO_xfilmsweredepositedonacarbonsteelsurfacefortheanti-corrosionpurpose.Theexperimentwascarriedoutina0.1MNaC1solution.Itwasfoundthataverygoodanti-corrosivepropertywasobtained,i.e.,thecorrosionratewasdecreasedc.a.15timesin5%NaClsolutioncomparedtothenon-SiO_xcoatedsteel,asdetectedbythepotentiodynamicpolarizationmeasurement.
简介:A1-Dfluidmodelforhomogeneousdielectricbarrierdischarge(DBD)inheliumispresented,aimedatunravelingthespatial-temporalcharacteristicsoftwobasicdischargeregimes:single-breakdownandmulti-breakdowndischarges.Dischargecurrents,gapvoltages,chargedensities,electrontemperatureandelectricfieldprofilesofthetworegimesmakeitclearthatthesetworegimesarequalitativelydifferent.Itisfoundthatthemulti-breakdowndischargehasamorehomogeneousfluxondielectricscomparedtothesingle-breakdowndischarge.
简介:阻抗为一个马克思发电机和DBD灯匹配的目的马克思发电机是限制产量当前的,在点火提供大分泌物电流,并且快获得电压升起/掉落边并且大射。在这份报纸,不同阻抗匹配电路(与平行电容器相结合的系列引导者,平行电容器,和系列引导者)被分析。它证明一个系列电感器能限制马克思电流。然而,分泌物电流也是有限的。一个平行电容器能提供大分泌物电流,而是马克思电流也被扩大。与一个平行电容器相结合的一个系列电感器充分利用电感器和电容器,并且避免他们的缺点。因此,它是一个好答案。试验性的结果匹配理论分析很好并且两个都显示出那系列引导者和平行电容器改进系统的性能。然而,与平行电容器相结合的系列引导者有最好的表演。与直接与一个马克思生成器驾驶DBD灯相比,97.3%的增加尽最大努力并且系统效率的59.3%的增加用这个匹配的电路被完成。
简介:在无线射频技术中,一般均会涉及到经过天线向空中辐射射频功率的问题。通常情况下有关功率的概念是简单而又清晰的,但是经过天线这一环节之后,情况变得有些复杂。人们常常将erp(等/有效辐射)功率与eirp(等/有效全向辐射)功率的物理意义混淆,并造成误解。在天线的增益描述方面也存在相类似的情况,天线增益的单位有dBd与dBi,两者之间的含义差别,常混淆不清。本文将在模型定义的基础上,对天线的辐射功率及相关单位进行分析;详细讨论有关等效全向辐射功率eirp与等效辐射功率erp的概念与相互关系;在引入点源全向辐射天线、半波偶极子辐射天线及参考天线的概念后,详细讨论天线增益单位dBd与dBi定义的来历及其换算关系以达到明析物理概念。正确掌握与运用erp/eirp和dBd/dBi的概念,有助于为RFID读写器设计提供一个清晰的输出功率参照。