雙元工質(zhì)在噴射制冷系統(tǒng)中循環(huán)機(jī)理的研究.pdf

1、天津大學(xué)博士學(xué)位論文雙元工質(zhì)在噴射制冷系統(tǒng)中循環(huán)機(jī)理的研究姓名：張于峰申請學(xué)位級別：博士專業(yè)：動力工程及機(jī)械指導(dǎo)教師：王仕康20030601ABSTRUCTAnewmodelofjet—refrigerationcyclewiththebinarymixturerefrigerantispresentedinthethesis，inwhichthedisadvantageoftraditionaljet—refrigerationsys

2、temusingpurerefrigerant，ierefrigerantevaporatingatrelativelyhightemperatureduetolowpressureratioB，hasbeenremovedOwingtothecharacteristitsofbinarymixturerefrigerantevaporatingatlowtemperatureandofwetcompressionofejector，i

3、tmakespossibletolowertheevaporatingtemperatureunderthesamepressureratioandfurthermoretoextendtheapplicationofjet—refrigerationInpresentthesiS，thefeasibilitystudyonthejet—refrigerationcyclewiththebinarynon—azeotropicrefri

4、gerantiScarriedoutandafterwardsthethermodynamicscycleiSpreformedusingaself～mademathematicalmodelTheoreticalanalysiSandnumericalcalculationindicatethatthelow—temperatureevaporationofbinarymixtureinanejector—coolingsystemi

5、SpossibletherebyimprovingitsrefrigeratingqualityTheejector，initself，iSappl]cableforthecompressionofbinarymixtureandthereforeguaranteetheabovementionedspecialcycleattechnicalaspectAsthemostimportantcomponent，thedesignofej

6、ectoriscrucialtoinfluencetheperformanceofthewh01esystemInmythemS，anewnumericalmethodofmodelingejectoriSpresented，whichisbasedonthepropertiesoftheworkingfluid，fundamentalthermodynamics，vapor一1iquidequilibriumandfluidmecha

7、nicstakingintoaccountthedisadvantagesofclassicalmethods一一thermodynamicsorgasaerodynamicsAccordingtothismodel，thenumericalcalculationofanejectorwithtwo—phasehighspeedflowiSperformedandthedesigniSsubsequentlymadeUs]ngthree