電站空冷風(fēng)機(jī)集群效應(yīng)的數(shù)值模擬.pdf

1、華北電力大學(xué)(北京)碩士學(xué)位論文電站空冷風(fēng)機(jī)集群效應(yīng)的數(shù)值模擬姓名：董運(yùn)寧申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：動(dòng)力工程及工程熱物理；工程熱物理指導(dǎo)教師：杜小澤201103華北電力大學(xué)碩卜學(xué)位論文AbstractDecadesofaxialflowfansisadoptedbydirectaircooledsystemtoprovideaircooledcondenserwithcoolingmediumItisdifferentfromtheaer

2、odynamicbehaviorofanindividualfanItisofimportancetoinvestigatetheclustereffectofthearrayofaxialflOWfansforthesafeandefficientoperationofthedirectaircooledsystemFirstlyinviewofexistingquestionaboutthefanmodelinFLUENT，thet

3、angentialvelocityisintroducedbyusingUDF’andamethodforsettingupperformancecuiveofaxialflowfansisfoundWhenthetangentialvelocityisintroducedornot，thedifierenceoftheflowfieldisobtainedbyCFDsimulationTheresultsshowthat：theflO

4、WfieldwillbechangedgreatlyifthetangentialvelocityisintroducedSOthisconditionshouldnotbeignoredintheCFDsimulationAnditisusefulfortheoptimaldesigningofaircoolingislandSecondly，theflowrateofeachfanandtheoverallflOWrateofthe

5、arrayoffansareobtainedatnoambientwindsandatvariOUSwindspeedsanddirectionsbyusingCFDsimulationTheclusterfactorofeachfanandthemacroscopicclusterfactorofthearrayoffansarecalculatedatdifferentconditionsTheresultsshowthatthec

6、lusterfactorisdifferentfromeachotherandalsepresentstheunliketrendsatnowindsandattheambientwindsTheclusterfactorofthefanthatliestotheperipheryofthearrayoffansorintheupwindoftheambientwindsisgenerallysmallAndtheclusterfact

7、oralsovarieswiththewinddirectionsThemacroscopicclusterfactordecreaseswiththeincreaseofthewindspeedsandalsovarieswidelywiththewinddirectionsThewindblowing行omtheboilerhousetotheaircooledsystemisthemostunfavorable，inwhichth

8、emacroscopicclusterfactoroftheaircooledsystemisthelowestTheclustereffectofthearrayoffansisofusefortheoptimaldesignandoperationofaxialflowfansforaircooledcondensersinpowerplantKeywords：directaircooledsystem；axialflowfan；c