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1、第31卷第1期航空學(xué)報V01.31No.12010年1月ACTAAERONAUTICAETASTRONAUTICASINICAJan.2010文章編號:1000一6893(2010)01一0058—12軸流壓氣機轉(zhuǎn)子尖部三維復(fù)雜流動Ⅱ數(shù)值模擬研究于賢君,劉寶杰,蔣浩康(北京航空航天大學(xué)航空發(fā)動機熱動力國防重點實驗室,北京100191)Three-dimensionalFlowsnearRotorTipinanAxialCompressor1I·-—-——NumericalSimulationStudyYuXi
2、anjUlI,LiuBaojie,JiangHaokang(NationalKeyLaboratoryofAero-engines,BeijingUniversityofAeronauticsandAstronautics,Beijing100191,China)摘要:在實驗研究和理論分析的基礎(chǔ)上,對亞聲速壓氣機轉(zhuǎn)子尖部復(fù)雜流動做了數(shù)值模擬研究,旨在進一步深入研究葉尖間隙和進口總壓分布對轉(zhuǎn)子葉尖復(fù)雜流動的影響。首先通過對與實驗條件相同的轉(zhuǎn)子尖部復(fù)雜流動的數(shù)值模擬研究,校驗了數(shù)值模擬結(jié)果,并分析了轉(zhuǎn)子尖部復(fù)雜流
3、動速度場、壓力場和渦量場分布特性。然后通過改變?nèi)~尖間隙尺度和進口總壓分布,研究了二者對近葉尖復(fù)雜流動的影響。研究結(jié)果表明:當(dāng)葉尖問隙小于1%葉片弦長時角區(qū)旋渦的發(fā)展是導(dǎo)致轉(zhuǎn)子失速的關(guān)鍵;而當(dāng)葉尖間隙大于2%葉片弦長時葉尖泄漏渦的發(fā)展是導(dǎo)致轉(zhuǎn)子失速的關(guān)鍵;改變進口總壓分布可以合理地組織轉(zhuǎn)子尖部流動并擴大轉(zhuǎn)子工作裕度。此外,通過觀測近葉片吸力面二維渦線的發(fā)展趨勢可以判斷葉尖復(fù)雜流動的發(fā)展?fàn)顟B(tài)。關(guān)鍵詞:葉尖泄漏渦;角區(qū)旋渦;二次流;數(shù)值模擬;壓氣機中圖分類號:V231.3文獻標(biāo)識碼:AAbstract:Basedo
4、nexperimentalandtheoreticalstudiesofthethree-dimensionalrotortipflowsinalow-speedaxialcompressor,numericalsimulationstudiesareconductedtOclarifytheeffectsofthechangingtipclearancesizesandtotalinletpressuredistributionsontherotortipflows.First,numericalsimul
5、ationisconductedwiththesamegeometryandboundaryconditionsasthoseintheexperimentalinvestigation,andthesimulatedre-suitsarevalidatedbytheexperimentalresults.Furtherstudiesoftheneartipflowsareconductedbyanalyzingthesimulatedvelocity,vorticityandstaticpressurefi
6、elds.Then,bychangingthetipclearancesizesandtotalinletpressuredistributions,numericalsimulationisperformedagainandtheneartipflowsareanalyzedinde-tail.Theresultsshowthatwhenthetipclearanceissmallerthan1%ofthebladechord,theevolutionofthecornervortexdeterminest
7、hestabilityoftherotor;however,asthetipclearanceincreasesto2%oftheblade{chord,thetipleakagevortexbecomesthekeyflowstructure.Moreover,itisfoundthattheevolutionproee-dureofthenearsuctionsurfacetwo-dimensionalvortexlineshasacloserelationshipwiththerotortipflows
8、.Keywords:tipleakagevortex)cornervortex)secondaryflow)numericalsimulation)compressor眾所周知,對壓氣機內(nèi)部復(fù)雜流動的認(rèn)識決定了壓氣機的設(shè)計水平[1。2]。壓氣機內(nèi)部的流動本質(zhì)上具有強三維和非定常的特性,尤其是在近端壁的區(qū)域流動尤為復(fù)雜,這里的復(fù)雜二次流動的控制是提高壓氣機負(fù)荷、效率和穩(wěn)定性的關(guān)鍵[3’4]。雖然經(jīng)過了