纯净空气来流下支板凹腔耦合超燃燃烧室性能研究

ExperimentalInvestigationofPerformanceofaStrut-CavityBasedScramjetCombustorinCleanAir

关键词:  纯净空气  超燃  支板  凹腔中图分类号:V211.72文献标识码:A文章编号:1001-4055(2015)12-1868-06DOI:10.13675/j.cnki.tjjs.2015.12.016

Key words:  Cleanair  Supersoniccombustion  Strut  Cavity

摘要:

在纯净空气来流下，通过试验对以支板凹腔耦合方式来稳焰的超燃燃烧室进行了研究，以液态航空煤油为燃料，喷射分为支板单独喷射和支板壁面组合喷射。结果表明:支板单独喷射，轴向位置靠前或者燃油当量比增加0.1，壁面压力分布总体越高，壁面压力峰值也更高；燃油当量比相同的情况下，支板单独喷射的壁面压力分布要比支板和壁面组合喷射的总体偏高，但壁面压力提升的起始位置更靠前；通过一维冲量法分析得到，燃烧室最低马赫数低于0.5，沿轴向中间大部分区域为亚声速；支板单独喷射轴向位置靠前，燃烧效率更高；当量比相同的情况下，支板单独喷射的燃烧效率要比支板和壁面组合喷射的燃烧效率更高。

Abstract:

Experimentswereperformedtostudytheperformanceofastrut-cavitybasedscramjetcombus.torincleanair.Thefuelwasliquidkerosenethatwasinjectedfromthesidewallsofthestrutorbothofthestrutandthesidewallsofthecombustor.Theresultsshowthat，whenthefuelwasinjectedupstreamfromstrutaloneorthefuelequivalenceratioincreasedby0.1，theoverallwallpressureandthepeakwallpressurewerehigher.Whenthetotalfuelequivalenceratiowasfixed，theoverallwallpressureoftheinjectionfromstrutalonewerehigherthanthatfrombothofthestrutandthesidewallsofthecombustor，buttheoriginalpressurerisewasup.stream.Aone-dimensionalanalysiscodewasusedtoobtaintheaxialMachnumberandthecombustionefficien.cy.TheminimumcombustorMachnumberwaslowerthan0.5，andmostareaofthecenterofthecombustorwassubsonic.Whenthefuelwasinjectedupstreamfromstrutalone，thecombustionefficiencywashigher.Whenthetotalfuelequivalenceratiowasfixed，thecombustionefficiencyoftheinjectionfromstrutalonewashigherthanthatfrombothofthestrutandthesidewallsofthecombustor.