動力渦輪驅動的逆升壓式空氣循環(huán)制冷系統(tǒng)的設計與優(yōu)化.pdf

1、南京航空航天大學碩士學位論文動力渦輪驅動的逆升壓式空氣循環(huán)制冷系統(tǒng)的設計與優(yōu)化姓名：郭僑申請學位級別：碩士專業(yè)：人機與環(huán)境工程指導教師：劉衛(wèi)華20090301動力渦輪驅動的逆升壓式空氣循環(huán)制冷系統(tǒng)的設計與優(yōu)化IIAbstractEximiousenvironmentcontrolsystem(ECS)oftheelectronicpodisthepreconditionofitssafehighefficiencywk.ReverseB

2、ootstrapAirCycleRefrigerationSystemDrivenbyPoweredTurbinewhichhassimplestructurelightweightlowcompensatylossgoodadaptabilityisjusttherightECSthatcanbeusedinelectronicpods.InthispaperfirstlymathematicmodelsofequipmentsinR

3、everseBootstrapAirCycleRefrigerationSystemDrivenByPoweredTurbinesuchasairinterfacecoolingturbinecompressheatexchangeraresummedup.Secondlyacomputationalmethodwhichisusedtomatchingallpartsofsystemswitheachotherispresentedb

4、asedontheacteristicthatcompressturbinesharethesamerotatingaxis.FinallyaccdingtothesystemcompensatylossanoptimizationalgithmmethodofECSispresentedbasedonwhichtheresearchonECSoptimizationisdone.Conclusionsareasfollows1)Hea

5、tload——withtheincrementofheatloadatdesignpointmassflowrateofcoolingturbineweightofsystemthedragfceofairinterfacegrowupwhenatthemaximumheatloadstateboththemaximummassflowratedragfcedecrease.2)Machnumber――asthemachnumberin

6、creasesmassflowrateofcoolingturbinedecreasesgetstheminimumatthemaximumsystemheatload.BothweightofsystemdragfceofairinterfaceincreasewithMachnumber.Atthesametimedragfceofairinterfacefollowsacurvelikeparabolafirstlyitdesce

7、ndswithMachnumberwhenMachnumberbecomessufficientlylargeitends.3)Height——Massflowrateofsystemsystemtotalweightdragfceofairinterfacedescendwiththeheightofdesignpoint.Butwhenatthemaximumheatloadpointthemaximumdragfceofairin

8、terfacefollowsacurvelikeparabolafirstlyitdescendswithheightwhenheightbecomessufficientlylargeitendswithheight.4)Thesystemoptimizationbasedontheenvelopeofelectronicpodpresentsthatwhensettingtheparameters——heightequalsto8k

9、mmachnumberequalsto0.781systemheatloadequalsto2.998kw――asdesignpointthesystemcompensatylossgetsitsminimumincurrentenvelopewhichmeansthebestdesignpointisfound.KeyWds:poweredturbineaircyclesystemcompresspodrefrigerationsys