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1、第35卷第1期兵工學(xué)報(bào)V01.35No.12014年1月ACTAARMAMENTARIIJan.2014超聲速流動(dòng)中底部排氣減阻的數(shù)值研究卓長(zhǎng)飛,武曉松,封鋒(南京理工大學(xué)機(jī)械工程學(xué)院,江蘇南京210094)摘要:為了研究超聲速流動(dòng)中底部排氣減阻特性,采用高精度的AUSMPW+迎風(fēng)格式、k一∞SST湍流模型、8組分l2反應(yīng)化學(xué)動(dòng)力學(xué)模型、二階矩湍流燃燒模型耦合求解三維帶化學(xué)反應(yīng)的Navier—Stokes方程。在數(shù)值方法的有效性和可靠性經(jīng)過(guò)驗(yàn)證后,對(duì)超聲速流動(dòng)底部排真實(shí)氣體流場(chǎng)進(jìn)行了數(shù)值模擬。計(jì)算結(jié)果表明:隨著排氣參數(shù)的增大,底壓比將先增大后減小,
2、然后再增大;當(dāng)排氣參數(shù)較小時(shí),底壓比基本不隨排氣面積的改變而改變。當(dāng)排氣參數(shù)較大時(shí),底壓比隨著排氣面積的增大而增大;在最佳排氣減阻區(qū)內(nèi),提高排氣總溫對(duì)提高底壓比是有利的;底部排氣中富燃?xì)怏w含量越高,則二次燃燒越強(qiáng),有利于提高底壓比。研究結(jié)果可為底部排氣彈工程應(yīng)用提供參考。關(guān)鍵詞:流體力學(xué);底部排氣彈;底部阻力;底壓比;減阻特性中圖分類(lèi)號(hào):V411.3文獻(xiàn)標(biāo)志碼:A文章編號(hào):1000—1093(2014)O1.0018-09DOI:10.3969/i.issn.1000.1093.2014.O1.003NumericalResearchonDragR
3、eductionofBaseBleedinSupersonicFlowZHUOChang—fei,WUXiao—song,F(xiàn)ENGFeng(SchoolofMechanicalEngineering,NanjingUniversityofScienceandTechnology,Nanjing210094,Jiangsu,China)Abstract:Inordertoresearchthedragreductioncharacteristicsofbasebleedinsupersonicflowthree—,dimensionalNavier—
4、Stokesequationswithchemicalreactionsaresolvedbythehigh—-accuracyupwindscheme(AUSMPW+),一∞SSTturbulencemodel,8species/12reactionkineticsmodel,andsecond—orderturbulentcombustionmode1.Theflowfieldbasedontheactualbasebleedgasinsupersonicflowisnumericallysimulatedbyverifyingtheeffec
5、tivenessandreliabilityofthenumericalmethods.Thecalcu.1atedresultsshowthat,withtheincreaseinbasebleedparameter,thebasepressureratioincreasesandthendecrease,andfinallyittendstoincrease.Whenthebasebleedparameterissmallbasepressure,ratiodoesnotchangewithbasebleedarea.Whilebaseblee
6、dparameterislarge,thebasepressureratioincreaseswithbasebleedarea.Increasingthetemperatureofbasebleedgasisfavorabletoincreasethebasepressureratio.Theintensityofthesecondarycombustionimproveswiththeincreaseinthecontentoffuel—richgasinbasebleedgas,whichcanimprovethebasepressurera
7、tio.Theresultscanproviderefer—encefortheengineeringapplicationofbasebleedprojectile.Keywords:fluidmechanics;basebleedprojectile;basedrag;basepressureratio;dragreductioncha。racterjstiCS收稿日期:2013-03-19基金項(xiàng)目:總裝備部“十2.22”預(yù)先研究項(xiàng)目(404040302);江蘇省普通高校研究生科研創(chuàng)新計(jì)劃項(xiàng)目(CXLX13202)作者簡(jiǎn)介:卓長(zhǎng)飛(1987一)
8、,男,博士研究生。E—mail:njust203zcf@126.com;武曉松(196O一),男,教授,博士生導(dǎo)師。E-m