微型風扇葉頂間隙內部流場和靜特性計算.pdf

1、浙江理工大學碩士學位論文微型風扇葉頂間隙內部流場和靜特性計算姓名：舒?zhèn)ド暾垖W位級別：碩士專業(yè)：流體機械及工程指導教師：金英子20081229浙江理工大學碩士學位論文CalculationoftipclearanceinternalflowfieldandstaticcharacteristiesofmicrofanAbstractMiniatureaxialflowfan(impellerdiameterD200m／n，airflowQ

2、1000m3／h)waswidelyappliedinchemical，mechanicalandotherindustriesaswellasincivilianelectricequipmentsuchasairconditioners，refrigeratorscomputers，electrichairdryersandSOonTherearemanydifferencesfromlow—pressureaxialfanonso

3、ftware_EU田：套江了11einnerflowfieldofmicroaxialfanheatexchangerwassimulatedandcomputedbyNavierStokesequationandthestandardk一占modelIncontrastwiththetestresultsthereliabilityofthenumericalsimulationWasverified，basedonwhichthes

4、taticcharacteristicsoftheflowfieldoftheexportandtipclearancewasanalyzedasfollow：(1)Theexistenceanddevelopmentlawofthetailvestigewereanalyzed，theregionwidth，lengthofthetailvestigeandthedistributionandchanginglawoffluidvel

5、ocityvectorintheaxial，radialandtangentialdirectionwereobtained(2)Theimpactofaxial—flowfantipclearanceontheperformanceofthefan，aswellasthechanginganddevelopmentoftipleakagevortexasthesizechangeofthegapwereanalyzed，withthe

6、resultofwhichtheoptimizeddesignofthemicro—axialfan，aswellasnoisereductioncanbedone(3)TheflowlawoftipclearanceleakageflowwasobtainedTheconfigurationoftheleakageflowtransferredfromleakagejetflowtoleakagevortexesastheenlarg

7、ingofthetipclearanceTheintensityofvortexesincreasedrapidlytothemaximumwiththeenlargementoftipclearanceTipclearancevortexesgeneratedatthesuctionsideneartheimpellerbladetipregionanddevelopedtowardsthepressure—orienteddirec