wind tunnel complex - aerospace.sdsu.eduwind tunnel complex the wind tunnel complex supports...

TheSDSUWindTunnelComplexThewindtunnelcomplexsupportscontinuousundergraduateactivitiessuchasAE303andAE403,numerousgraduateprojects,andsomeexternalprojectsaswell.Thefacilityconsistsof:

1) Subsonicwindtunnel2) Supersonicwindtunnel3) Smoketunnel4) Machineshop

INSTRUMENTATIONSix‐componentfloormountedbalance(specificationarelistedabove)Six‐componentstingbalance(specification???)6singlecomponentloadcells(+‐100lb)2six‐componentloadcells(one+‐100lbs,other+‐40lbs)

1each48portmechanicalScanivalve(+‐1.00psi)1each48portmechanicalScanivalve(+‐15.00psi)1LaVision3dimensionalparticleimagesystemAlltheseinstrumentcanbeconnectedtoacentralcomputerviaaLabViewsystem.WindTunnelDimensionsSideview

FrontView

SANDIEGOSTATEUNIVERSITY6”x6”SUPERSONICWINDTUNNEL

TheSanDiegoStateUniversitywindtunnelwasdesignedandconstructedbyKenneyEngineeringCorporationandputintooperationin1963.Duringrecentyears,severalmodificationswereintroducedintotheairpumping,tunnelcontrol,andinstrumentationequipmenttokeepupwithcurrenttechnology.TheairpumpingsystemconsistsofaLeRoi/DresserModel256S2C2‐stageaircompressordrivenbya125hpmotor.Thecompressorcanpumpthestoragesystemupto250psig.Adryingandfilteringsystemisprovidedwhichincludesbothdryingbycoolinganddryingbyabsorption.Airstoragesystemconsistsofasingle5,000galltank.TunnelcontrolsystemincludesaToshibaEC321ProcessLoopControllerandaquickopening,pneumaticallyactuatedbutterflyvalve.

Thesettlingchambercontainsseveraldampingscreens,andprobesmeasuringstagnationpressureandtemperature.Thenozzlechamberisdesignedwithinterchangeable,two‐dimensionalcontourednozzleblocksmadeofcastaluminum.ThetunnelisequippedwithfourcompletenozzleblocksetsfortheMachnumbers1.0,2.0,3.0,and4.5.Recentlywe’vedevelopedaperforatedwalltestsectionfortransonicflowmeasurements.Thetestsectionofthetunnel,whichmeasures6”x6”x10”,isequippedwitharemotelycontrolledmodelsupportforcontrollingtheangleofattack.Themodelholdermovesinapuretranslationintheverticaldirectionasthecontrolstrutismovedupanddown.Themaximumangleofattackisabout+/‐25degrees.Afterpassingthroughadiffuser,theairflowisdischargedintotheatmospheretroughamufflerandthenexhaustedtotheoutsideofthebuilding.Testruntimesdepend,ofcourse,onMachnumberandthestagnationpressure.Approximatetimesareshownintheablebelow:

MachNumber StagnationPressure,psi RunTime,Seconds1.0 30 302.0 30 303.0 70 204.5 180 10

InstrumentationA20cmSchlierensystemcomprisingtwoopticalbenchesisusedtovisualizeshockwavesinthetestsection.AdataacquisitionsystemcomprisingLabViewsoftwareanda32‐channelScanivalveZOCsystemutilizing15psitransducersisusedforpressuremeasurements.GeneralviewoftheSupersonictunnel

MachineShopandProjectsupport3Lathes2Millingmachines1Quickprototype(printer)Woodshopandcompositepreparationfacility(+oven)CostsandServices

Current$400/hour for Wind tunneloccupancy $220/hour for model set up

Themachineshopisavailableformodelmountingandsetupfabrication