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1、DissertationSubmittedtoShanghaiJiaoTongUniversityfortheDegreeofMasterNUMERICALANDEXPERIMENTALINVESTIGATIONOFFLOWFIELDANDPERFORMANCEINCOMPRESSORTANDEMCASCADESCandidate:ShenChunStudentID:1104139027Supervisor:Prof.TengJinfangAcademicDegreeAppliedfor:MasterofEngineeringSpeciality:AircraftDe
2、signSchoolofAeronauticsandAffiliation:AstronauticsDateofDefence:Dec,2012Degree-Conferring-Institution:ShanghaiJiaoTongUniversity萬方數(shù)據(jù)萬方數(shù)據(jù)萬方數(shù)據(jù)上海交通大學(xué)碩士學(xué)位論文壓氣機(jī)串列葉柵流場特性的數(shù)值模擬與實(shí)驗(yàn)研究摘要當(dāng)壓氣機(jī)末級靜子葉片氣流轉(zhuǎn)角過大,無法用單排葉片實(shí)現(xiàn)時(shí),通常可以采用串列葉柵來實(shí)現(xiàn)氣流的折轉(zhuǎn)。在選定葉型和軸向相對位置的情況下,周向相對位置對串列葉柵設(shè)計(jì)點(diǎn)和非設(shè)計(jì)點(diǎn)性能都有較大影響。為此,本文首先采用數(shù)值模擬研究方法,選取
3、雙圓弧葉型的壓氣機(jī)靜子串列葉柵,在不同周向相對位置情況下考察其設(shè)計(jì)點(diǎn)和非設(shè)計(jì)點(diǎn)的氣動(dòng)性能和流場特性。其次,對周向相對位置(-10%,0.67)和(-10%,0.80)型兩種方案的串列葉柵進(jìn)行低速吹風(fēng)實(shí)驗(yàn)研究,采用TR-PIV流場測試系統(tǒng)測量并分析了設(shè)計(jì)攻角下其時(shí)均和瞬時(shí)的流場。對串列葉柵進(jìn)行了高、低速數(shù)值模擬,對比分析了不同周向相對位置在不同攻角下對葉柵氣動(dòng)性能和流場特性的影響。結(jié)果表明:設(shè)計(jì)攻角工況下,對于高馬赫數(shù)來流工況,當(dāng)軸向相對距離為-10%且周向相對位置在0.80到0.83之間時(shí),串列葉柵的氣動(dòng)性能和流場特性相對較好,前后排葉片所形成狹縫的射流作用增強(qiáng),改善
4、了后排流動(dòng)拓?fù)浣Y(jié)構(gòu),對后排葉片附面層產(chǎn)生吹除作用。在非設(shè)計(jì)攻角工況下,串列葉柵在-11°到+4°攻角范圍內(nèi)具有較好的氣動(dòng)性能和流場特性。高低速數(shù)值計(jì)算的吻合程度較好。運(yùn)用高頻響TR-PIV流場測試設(shè)備對位置(-10%,0.67)和(-10%,0.80)型串列葉柵在設(shè)計(jì)攻角下進(jìn)行了實(shí)驗(yàn)研究。實(shí)驗(yàn)時(shí)均值與高速數(shù)值結(jié)果吻合程度較好。實(shí)驗(yàn)結(jié)果表明葉柵流場主流區(qū)域和尾跡區(qū)域的非定常性都較強(qiáng);位置(-10%,0.80)方案串列葉柵整體葉片尾跡寬度較窄,脫落渦尺寸較小,與主流摻混程度較弱,損失較低。關(guān)鍵詞:壓氣機(jī);串列葉柵;周向位置;攻角;數(shù)值模擬;實(shí)驗(yàn)研究-I-萬方數(shù)據(jù)上海交通大
5、學(xué)碩士學(xué)位論文NUMERICALANDEXPERIMENTALINVESTIGATIONOFFLOWFIELDANDPERFORMANCEINCOMPRESSORTANDEMCASCADESABSTRACTAstraditionalstatorcanhardlyachievetheairdeflectionoffinalstagestatorincompressor,tandemcascadeisusuallyusedtorealizeit.Tangentialdisplacementisamainparameterwhenbladeprofileandaxialdi
6、splacementarechosen,whichaffectstheaerodynamicperformancesignificantlyatbothdesignandoff-designpoints.So,firstly,asDCAbladeprofileischosen,numericalmethodisusedtoinvestigatetheeffectsoftangentialdisplacementontandemcascadeflowfieldandperformanceatbothdesignandoff-designpoints;then,posit
7、ion(-10%,0.67)and(-10%,0.80)arechosentotakenintoexperimentalinvestigationinlowspeedwindtunnelwithTR-PIVatdesignpointtocaptureandanalyzethetime-averagedandtemperoryflowfieldboth.Tandemcascadeswithdifferenttangentialdisplacementweretakenintonumericalinvestigationatbothhighandlowi