文献翻译-高压细水雾灭火喷嘴的研究

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1、附录DEVELOPMENTONHIGH-PRESSUREFINEMISTNOZZLEFORFIRESUPPRESSIONABSTRACTNozzleisavitalexecutingcomponentofhigh-pressurefinewatersprayforfiresuppressionsystem.Thedropletdistributionofdouble-deck(twin-fluid)fullconenozzleismoreequableandcancoverlargerfireareath

2、ansingleone.Byignoringradialvarianceoffluidaxialvelocity,adesigningmethodondouble-deckfullconenozzleisproposed.Finally，anexperimentisperformed，whoseresultsareaccordingwellwiththecountingdata.KEYWORDSwatermistforfiresuppression;nozzle;design1INTRODUCTIONWi

3、ththeinevitableeliminationofHalonproductionunderthetermsoftheamendedMontrealprotocol，extensiveeffectshavebeenmadetofindalternativemeansofactivefireprotectionoverthelastyears，Thefirewatermistspossesseslargesurfacearea.Presentationofsuchalargesurfaceareaofw

4、aterallowsmoretheheattobeabstractedfromthereaction.Whenithappensitsvolumerapidlyexpands,whichreducesthetemperatureandoxygendensitywithincombustingregion.Theadvantagesoffirewatermistforfiresuppressionincludesfastandeffectivefirefightingfunction，minimumquan

5、tityofwaterrequirement，lowwaterlossesandnopollutionforenvironment.IthasbeeninfactexpectedthemostpotentialsubstituteofHalonfiresuppressionsystem.Thefinewatermistsforfiresuppressionmustsatisfytwoconditions⑴:①Thedropletsshoulddistributeequably，whichmayformst

6、eadyfullsprayconetocovercombustingregion.②Thedropletshavegreatermomentumandareabletopenetratetheplumetotheseatofthefire.Nozzleistheoneofefectivehighwaystorealizeliquidatomization.Comparedwithtwin-fluidatomizer，powerconsumptionofthecentrifugalpressurenozzl

7、eisextremelylittle.Accordingtothedistrbutionofdroplets，mistscanbedividedintohollowconeandfullcone.Trditionalnozzleoriginatedinevaporation,whosemistsarehollowcone.Thespurtingdistanceofhollowconenozzleisusuallytooshorttoputoutthefireeffectively.Thespurtingd

8、istanceoffullconenozzleislong，henceitisusedtofiresuppression.Butdistributionofthedropletsandsprayingdensityoffullconenozzleisnotspheral.Thedropletsnearbythenozzleaxisarethick，theoutskirtsthindropletsareeasilydrawnin