超声速气流中电火花塞直接点燃煤油过程试验研究

推进技术 ›› 2015, Vol. 36 ›› Issue (12): 1839-1845.

超声速气流中电火花塞直接点燃煤油过程试验研究

李西鹏,刘卫东,潘余,刘世杰

国防科技大学高超声速冲压发动机技术重点实验室，湖南长沙410073,国防科技大学高超声速冲压发动机技术重点实验室，湖南长沙410073,国防科技大学高超声速冲压发动机技术重点实验室，湖南长沙410073,国防科技大学高超声速冲压发动机技术重点实验室，湖南长沙410073

发布日期:2021-08-15
作者简介:李西鹏(1990—)，男，硕士生，研究领域为航空宇航推进理论与工程高超声速推进技术。
基金资助:
国家自然科学基金(91116001)。

ExperimentalStudyonSparkIgnitionProcessofKerosenein

ScienceandTechnologyonScramjetLaboratory，NationalUniversityofDefenceTechnology，Changsha410073，China,ScienceandTechnologyonScramjetLaboratory，NationalUniversityofDefenceTechnology，Changsha410073，China,ScienceandTechnologyonScramjetLaboratory，NationalUniversityofDefenceTechnology，Changsha410073，China and ScienceandTechnologyonScramjetLaboratory，NationalUniversityofDefenceTechnology，Changsha410073，China

Published:2021-08-15

摘要/Abstract

摘要： 在来流总温1486K，总压1.6MPa，马赫数2.52的条件下，采用两级串联凹腔构型燃烧室，开展了电火花塞直接点燃航空煤油的试验研究。利用高速摄影相机进行观测，对比了不同煤油喷注方案和点火位置对火核生成和火焰传播的影响。通过上游凹腔前壁面水平喷注煤油、下游凹腔点火的方案可靠性高，在煤油与空气混合气的当量比为0.04～0.063均可实现煤油成功点火和稳定燃烧；串联凹腔构型可以提高点火性能的主要原因有两方面:一是下游凹腔有稳定火焰作用，火焰在边界层内逆流传播实现对上游凹腔的能量反馈；二是煤油蒸发、混合距离长，通过近壁区进入下游凹腔，形成了更为适宜的点火环境。

关键词: 超燃冲压发动机；凹腔；火花塞点火；煤油；喷注方案中图分类号:V231.1文献标识码:A文章编号:1001-4055(2015)12-1839-07DOI:10.13675/j.cnki.tjjs.2015.12.012

Abstract: Experimentalinvestigationsonsparkignitionofliquidkeroseneinascramjetcombustorwithtwo-stagedcavitieswereconductedattheinflowconditionsofMa=2.52，T0=1486K，p0=1.6MPa.Highspeedphotographywasusedtorecordertheflamepropagationprocesses，tocomparetheeffectsofkeroseneinjectionschemesandignitionpositionsontheformationofflamecoreandflamepropagation.Whenkerosenewasinjectedfromtheleadingedgeoftheupstreamcavity(overallequivalentratio=0.04～0.063)andignitedbythesparkinthedownstreamcavity，itwillleadtoareliableignitionwithlargemarginofflamestability.Thecombustorconfigurationwithtwo-stagecavitiescanimprovetheignitionability.Firstly，thedownstreamcavitystabilizestheflame，andthentheflamepropagatesupstreamthroughboundarylayerandprovidesenergyfortheignitioninupstreamcavity.Secondly，thekeroseneinjectedatupstreamcavitypassesalongdistanceinnearwallareaforevaporationandmixingwiththefreshairbeforeitisentrainedintothedownstreamcavity，andproduceabetterignitionenvironmentindownstreamcavity.

Key words: Scramjet；Cavity；Sparkignition；Kerosene；Injectionscheme

李西鹏,刘卫东,潘余,刘世杰. 超声速气流中电火花塞直接点燃煤油过程试验研究[J]. 推进技术, 2015, 36(12): 1839-1845.

LIXi-peng,LIUWei-dong,PANYu,LIUShi-jie. ExperimentalStudyonSparkIgnitionProcessofKerosenein[J]. Journal of Propulsion Technology, 2015, 36(12): 1839-1845.

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