进口斜激波、膨胀波干扰下等直隔离段内的激波串特性

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1、第31卷2010焦第9期9月航空学报ACTAAERONAUTlCAETASTRONAUTICASINICAVoI．3lNo．9Sept．2010文章编号：1000—6893(2010)09—1733—07进口斜激波、膨胀波干扰下等直隔离段内的激波串特性张航，谭慧俊，孙姝(南京航空航天大学内流研究中心，江苏南京210016)CharacteristicsofShock-traininaStraightIsolatorwithInterferenceofIncidentShockWavesandCornerExpansionWayesZhangHang，TanHuijun，S

2、unShu(InternalFlowResearchCenter，NanjingUniversityofAeronauticsandAstronautics，Nanjing210016，China)摘要：超燃冲压发动机的隔离段在实际工作中会受到进气道唇罩激波及肩部膨胀扇的显著干扰，本文针对这一特定问题进行了专门研究。提出了唇罩入射激波及肩部膨胀扇的模拟方法，并利用德国Achen的风洞试验对其进行了检验，而后以此研究了入射激波及肩部膨胀扇干扰下隔离段内激波串的基本形态，并分析了出口反压和激波入射位置的影响。仿真结果表明：当激波串在隔离段内不断前移时。受唇罩入射激波及其反射激

3、波的干扰，其高速核心区交替地偏向上下壁面；与无激波入射的情况相比，此时激波串的耐反压能力显著降低，且入射点位置越高，降低幅度越大，管道内的沿程静压分布规律与Waltrup经验公式偏离程度也越来越大。该文结果可为进气道／隔离段的一体化设计提供依据。关键词：激波串；唇罩入射激波；肩部膨胀波；隔离段中圈分类号：V231．3文献标识码：AAbstract：Theoperationoftheisolatorofascramjetissubstantiallyaffectedbycowlinducedshocksandcornerexpansionwaves．Thecurrentst

4、udyattemptstOrevealtheinfluenceoftheseincidentwavesontheflowpat-ternsandpressurerecoverycharacteristicsoftheshock—trainintheisolator．First，asimulationmethodfortheincidentshockandthecornerexpansionwavesisadvancedandvalidatedwithAchenwindtunnelexperimentalresultsinGermany．Then，thebasicflowp

5、atternsoftheshock—trainwiththeinfluenceoftheincidentshockwavesareanalyzed．Theeffectofthebackpressureratioandincidentpositionofthecowlinducedshockisalsoobtained．Theresultsindicatethatthesupersoniccoreflowregionoftheshock-traindeflectsalternativelytOthetopsurfaceandthebottomsurfaceoftheisol

6、atorwithitsupstreampropagationbecauseoftheinfluenceoftheincidentshockandreflectedshocks．Ascomparedwiththecasewithoutincidentshocks，thepressuregainacrosstheshock-trainissubstantiallydecreasedduetOtheincidentshockwaves．Thepressuredistributionde—viatesfromtheWaltrupempiricalformulacontinuous

7、lywiththeriseoftheincidentpointofthecowlinducedshocks．Theresultsobtainedmayprovideadesignguidefortheintegrationoftheinletandtheisolator．Keywords：shock-train，incidentshockwaves；cornerexpansionwaves；isolator作为进气道与燃烧室之间的气动热力缓冲段，隔离段是超燃冲压发动机的重要部件。隔离段内的超声速流动过程是一系列以激波／边界层干