文献翻译-高压细水雾灭火喷嘴的研究

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

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