AerodynamicNoiseCharacteristicsofAxialFlowFaninNarrowSpaceandNoiseReductionBasedonFlowControl
(ASMETURBOEXPOGT-)
ZonghanSun,PengfeiChai,JieTian,ZhaohuiDu,HuaOuyang*SchoolofMechanicalEngineering,ShanghaiJiaoTongUniversity,Shanghai,China择要
采纳实验和数值揣度,协商了电动汽车充电桩电源模块的气动声学特点。在解放场中,单个散炎风扇发出的噪声主借使单音噪声,而风扇并联时的远场噪声满意非干系声源的叠加。但是,当两个风扇并联向电源模块送风时,噪说显然增长,尤为是宽频噪声。参考电源模块,建造了散炎风扇向内送风的狭隘空间模子。CFD事实说明,下游阻滞物的存在升高了风扇的原料流量,减弱了风扇的散热本能。部份流体构成回流,与风扇彼此过问并加倍了角涡滚动。经过在回流左近的机壳上开设导流孔来引流,减小了滚动阻力,使风扇总原料流量抬高了2.5%。回流和角涡变得散开且更向下游进展,淘汰了与风扇的过问。基于声学类比法展望的单音声压级升高了3.2dBA,并用半阅历模子对零落涡引发的宽频噪声施行了展望和商议。在本质电源模块的降噪实验中,连接风扇上的进气喇叭口和机壳上的导流孔,总声压级显著升高了2.9dBA。格外是,在喇叭口的基本上,导向孔带来了额外的1.9dBA单音噪声升高和1.0dBA总声压级升高。协商说明,正当的滚动操纵对抬高电源模块的散热和升高噪声具备要害意义。这些事实对开辟更高功率的充电系统具备必然的参考代价。
Abstract
Theaeroacousticcharacteristicsofapowermoduleintheelectricvehiclechargingpileisstudiedbyexperimentalandnumericalmethods.Inthefreefield,asinglecoolingfanmainlyemitstonalnoise,whilethefar-fieldnoiseoffansinparallelsatisfiedthesuperpositionofincoherentsoundsources.However,whentwofansinparalleldeliveredairintothepowermodule,thenoiseincreasedsignificantly,especiallybroadbandnoise.Referringtothepowermodule,anarrowspacemodelwithcoolingfansupplyingairinwardisconstructed.The