单级压比8.0离心压气机扩稳流动控制方法研究

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5、´g:/"º5 BùâB9ÁÈ(ÁÈ20 JºìéT100%óþm-ÔÃ:ªýÿfrĄæºBjfr&ìé+$}Þíìé½gAV<Çcm#àSÏ225%ÕgàS¸4.4%<ß9.9%²¸79.9%^78.4%íìé+$àS*²½g*aìéđ¸íóþm-^þD¶T@QÜčIô:[´gàSº<«6Ĉ:ªýÿÛOfrā1óþm-Ąæº BT90%óþm-¸ ^þD¶TIôIk[:[´+½g_ºÇ#·v:ªýÿfr5.4mm@¢àS¸10.3%<ß17.6%*²¹^:ªýÿÛñĎøI®4Ù*²ñđđ²AV½

6、vT80%óþm-¸^þD¶TIôĆIđ[:[´ºÇ#·ĈÔÃă·:[´Þim#²¸77.2%<ß79.1%*m#àSµß¡ă·:[´¹ć:ªýÿĎøI®4Ùýÿfrfím-º$ìéIæ~ÜèÁÈ]ÇTJóþm-g@¢}ÞºwPqg*ÝLºm#´ùâîÒêëđ@¡Äz@¢ă·ú]Ç%?IIAbstractABSTRACT!Inmodernhelicopterturboshaftengines,spaceandweightareofgreatimportanceaswellasahighefficiency.Asinglesta

7、gehighpressureratiocentrifugalcompressordesignisespeciallypreferredduetoitssimplicityandcompactness.Thedifficultythatarisesfromusingsuchahighpressureratioisthatthestablerangeofthecompressordramaticallydecreaseswithincreasingpressureratio.Thereforeadditionalmeasureshavetobetakentoenhancetherangeof

8、thecompressor.Twopossibletechnologies,VariableInletGuideVanes(VIGV)andCasingTreatment(CT)arestudiedinthisthesisbymeansofcomputationalfluiddynamicssimulation.FortheVIGVtechnology,5differentstaggeranglesfrom-20°to+20°havebeenstudied.At100%designspeed,the-10°staggeranglecaseshowedverypromisingresult

9、swithanincreasedpeakpressureratiofrom8.03to8.28,anincreasedrangefrom4.1%to6.8%andanincreasedchokemassflowfrom2.68kg/sto2.75kg/s.Efficiencywasslightlydecreasedforthiscasefrom79.6%to78.3%comparedtothe0°case.The-20°stagge