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1、EffectofcrossWindonthePerformanceofaNaturaldrauftcounterflowCoolingTower1212ZhaoShunan,WangMingren,LiLujun,DuChengqi1ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing,ChinaTel.:+861068781608;Fax:+861068538685;Email:bjcc@iwhr.com2EastChinaDesignInstituteofElectricalPower,Shanghai,China
2、，Email:wmr@ecepdi.comABSTRACTThecoolingperformanceofcounter-flownaturaldraftcoolingtowercouldbereducedbythecrosswind,soitwasnecessarytotakeaccountoftheimpactofthecrosswindfortherevisionofthedesign.Inthispaper,one3dnumericalsimulationmethodwasusedtoresearchtheinfluenceofthecrosswindontheresistan
3、cecoefficientoftheairinletofcounter-flownaturaldraftcoolingtower.Theresultsshowedaverygoodagreementwiththeexperimentalresultswhichmeasuredbythewaterchannel.Theevaluatingformulasofthechangingoftheresistancecoefficientintheairinletzonefordifferentvelocityratioofthecrosswindtotheaveragevelocityoft
4、hefillzoneweregivenaccordingtotheresultsofthesimulation.Comparisonwiththemodeltestresultsshowedthattheformulasweremoreaccuracytopredicttheperformanceofthetower.Thereasonwasthesilknetwasusedtoinsteadoftheraindropintestmodelwhichhadbeendoneinthewaterchannel.Keywords:crosswind;coolingtower;airinle
5、t;pressurelosscoefficient.0.IntroductionTheinfluenceofcrosswindonthecoolingeffectiveofthecounterflownaturaldraftcoolingtowerhadbeenstudiedearlyin1970s.Asthecrosswindvelocityisbiggerthan4~10m/s,the[1]temperatureoftheoutletwaterwillincreaseabout1~2°C.In1980s,theinfluenceofthecrosswindontheeffecti
6、veofcoolingtowerhadbeenstudied[3,4]extensively.Theresearchmethodsincludecoldmodeltest,thermalmodeltest,windtunnel,waterchannelandsoon.Inmoststudies,theimpactoftheflowinletzoneandthecoolingtoweroutletwereresearchedseparately.In1990sthepreventionoftheimpactsofthecrosswindhad[5,6]beenpaidalotofatt
7、ention,andsomeproposeshadbeengivenforthecrosswindprevention.Recently,alotofstudiesonthecounterflownaturalcoolingtowerhavebeendoneinthepresent[7-9]ofthecrosswind.ByusingoftheCFDsoftware,theinfluencemechanismofthecrosswind1havebeene
