涡轮出口气流角对低速风力引射器流场影响的数值研究

NumericalResearchonEffectsofTurbineOutletFlow

关键词:  风力引射器  涡轮出口气流角  流向涡  正交涡  风力涡轮中图分类号:V231.3文献标识码:A文章编号:1001-4055(2015)12-1809-08DOI:10.13675/j.cnki.tjjs.2015.12.008

Key words:  Wind-ejector  Turbineoutletflowangle  Stream-wisevortice  Normalvortice  Windtur.bine

摘要:

为了开发先进的具有广泛适用性的低速风力涡轮，采用涡扇发动机喷管引射技术设计了双涵道风力涡轮，以新型低速引射式风力涡轮的引射混合器为研究对象，采用CFX商用软件基于RANS方程和k-Epsilon湍流模型，数值研究了涡轮出口气流角对风力引射器混合性能的影响。研究结果显示，涡轮出口气流与轴向夹角由0°增至30°，引起了波瓣后侧流向涡量迁移，最大正交涡量降低了1/3，波瓣内侧中部分离对涡与槽道吸力侧分离区汇合，风力引射器内流道总压损失从2.4%增大至5%，此夹角大于10°时外流场对称结构消失并失稳。

Abstract:

Theturbofanenginenozzleejectortechnologywasadoptedtodesignahigh-efficiencylowspeedwindturbinewiththedoublebypassforabroaderareasintheworld.Theaerodynamiccharacteristicsofthewind-ejectorofthenewwindturbinewerenumericallyresearchedonturbineoutletflowanglechangingbasedonReyn.olds-averagedNSequationsandk-Epsilonturbulencemodel，usingcommercialsoftwareCFX.Resultsshowthat，astheanglebetweenturbineoutletflowandtherotationaxisincreasedfrom0°to30°，thepositivevorticityofthestream-wisevorticepairsmigratedtothenegativevorticity，themaximumnormalvorticitywasgraduallyreducedby1/3，theseparationvortexpairsadhesionofthelobesweregraduallyforcedtomixwiththeseparationvorticesnearthesuctionsurfaceofthechannels，thetotalpressurelossinthelobesofthewind-ejectorin.creasedfrom2.4%to5%，andiftheanglewasgreaterthan10°，theflowstabilityofthewindturbineoutflowfieldrapidlydisappeared.