脈沖強(qiáng)磁場(chǎng)氦液化制冷系統(tǒng)流程及換熱器的優(yōu)化分析.pdf

1、華中科技大學(xué)碩士學(xué)位論文脈沖強(qiáng)磁場(chǎng)氦液化制冷系統(tǒng)流程及換熱器的優(yōu)化分析姓名：陳璐璐申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：制冷及低溫工程指導(dǎo)教師：舒水明20080528華中科技大學(xué)碩士學(xué)位論文華中科技大學(xué)碩士學(xué)位論文IIAbstractPulsedHighMagicFieldDeviceisimptanttoscienceresearchonextremecondition.ThecryogenicsystemofPulsedHighMagicFiel

2、dDeviceisconsistofliquidnitrogensystemliquid4Hesystemsuperfluidheliumsystem3Hesystem3He4HedilutionrefrigerationsystemGMrefrigeratsoon.Thispaperdesignsthe100LhheliumliquefactioncyclerefrigerationsystembasedonCollinscycle.

3、Collinsheliumliquefactioncyclehasitsselfacteristicinmediumsizedheliumliquefactioninstallationwhichadoptstwoexpersliquidnitrogencoolinghasfourcoolinglevelsinwhichthefirstlevelofhighesttemperatureisliquidnitrogencoolingthe

4、leveloflowesttemperatureadoptsthrottlingvalveOthersaretwoexperswkingindifferenttemperaturearea.ThispaperdesignstheprocessesofCollinsheliumliquefactioncycledevicediscussestheacteristicsionsofthemainthermalfacilities(screw

5、compressheliumturboexper).Heatexchangeristhekeycomponentsofthecycletheiondesignstructureparameterseffectstructuraloptimizationofwhichwerestudied.TheGiaqueHampsontypecoiledfinnedtubesheatexchangerischosenftheheatexchanger

6、ofheliumliquefactioncyclethethermaldesignmethodthestructureoptimizationmethodfheatexchangerarepresentedindertomeettherequireofminerpressure.Theeffectsofstructuresizesontheperfmanceareanalyzedindetail.Optimizationdesignof

7、thegeometricparameterofheatexchangeriscarriedoutusingheattransfervolumepertemperaturedifferenceregardingthevolumeofheatexchangerasobjectivefunction.Theoptimizedstructureparametersarepresentedfinally.Themethodtodesignopti