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1、上海交通大學(xué)碩士學(xué)位論文液氮過濾器過濾特性研究姓名：謝偉申請學(xué)位級(jí)別：碩士專業(yè)：制冷與低溫工程指導(dǎo)教師：石玉美20070201上海交通大學(xué)碩士學(xué)位論文摘要度以后增大的趨勢明顯放慢。（2）過濾過程的理論分析建立低溫過濾器過濾過程的壓降計(jì)算模型。利用實(shí)驗(yàn)數(shù)據(jù)擬合出模型中3個(gè)重要參數(shù)，并應(yīng)用模型對(duì)實(shí)際過濾過程的壓降進(jìn)行預(yù)測計(jì)算，其中包括對(duì)后續(xù)CGSE系統(tǒng)實(shí)際工況模擬實(shí)驗(yàn)的工況條件計(jì)算和CGSE系統(tǒng)實(shí)際中該過濾器的實(shí)際運(yùn)行工況計(jì)算。同時(shí)還預(yù)測了在這些過濾工況下過濾器的理論失效時(shí)間。關(guān)鍵詞：液氮、液氦、過濾
2、、壓降計(jì)算、燒結(jié)金屬過濾器V上海交通大學(xué)碩士學(xué)位論文摘要STUDYOFCHARACTERISTICSOFFILTERSUSEDTOFILTRATELIQUIDNITROGENABSTRACTCryogenicliquidfluidsarewidelyusedinsomehugescienceprojects,whichusuallyhaveveryspecialdemandsofthepurityofthosecryogenicliquidfluids.Thisstudyfocusesonhowt
3、oobtainhighlypurifiedcryogenicliquidfluids(thepercentageofpurity>99.999%)whichsatisfiesthedemandsofCGSEsystem.ThecharacteristicsofthecryogenicfilterusedinCGSEsystemarestudied.Thisstudyisbasedontheusageofengineeringproject.Itusestheoreticalanalysisande
4、xperimentalobservationtostudythecharacteristicsofthecryogenicfilter.Duringexperiment,theexperimentalplatformwhichisusedtosimulatetherealCGSEsystemisbuildandtheexperimentdataarerecordedbymanyrecordinginstruments.Byanalyzingtheexperimentdata,cometothese
5、conclusionsonsteadyprocessoffiltration:Ifilter’spressuredrop1)Thefilter’spressuredropincreasesasthepressureofcryogenicliquidfluidsgrows.2)Thefilter’spressuredropandtheflowrateofVI上海交通大學(xué)碩士學(xué)位論文摘要cryogenicliquidfluidsarelinear,whichmeanstheincreaseofflow
6、rateleadstotheincreaseofpressuredrop.3)Thefilter’spressuredropincreasesastheconcentrationofcryogenicliquidfluids’impuritygrows,butaftertheconcentrationofcryogenicliquidfluids’impuritycomestoacertainleveltheincreasetrendbecomeambiguous.IIfilter’scollec
7、tionefficiency1)Atthebeginning,thefilter’scollectionefficiencyincreasesgentlyastheflowrateofcryogenicliquidfluidsgrows.Afterthefilter’scollectionefficiencyachievesthemaximum,itbeginsdecreaseveryslowlyastheflowrateofcryogenicliquidfluidsincreases.2)Att
8、hebeginning,thefilter’scollectionefficiencyincreasesgentlyasthepressureofcryogenicliquidfluidsgrows.Afterthefilter’scollectionefficiencyachievesthemaximum,itbeginsdecreaseveryslowlyasthepressureofcryogenicliquidfluidsincreases.Theyformaparabol
