超燃燃烧室一维释热分布模型研究

AnInvestigationonOne-DimensionalModelofHeatRelease

关键词:  超燃冲压发动机  燃烧室  释热分布  凹腔稳焰器  迭代计算  一维模型中图分类号:V235.21文献标识码:A文章编号:1001-4055(2015)12-1852-07DOI:10.13675/j.cnki.tjjs.2015.12.014

Key words:  Scramjetengine  Combustor  Heatreleasedistribution  Cavityflameholder  Iterativecal.culation  One-dimensionalmodel

摘要:

为了预估超燃冲压发动机燃烧室内的释热分布，针对带凹腔稳焰器的燃烧室，总结了射流混合情况、来流温度和当量比对释热分布影响的实验规律，提出了主燃烧区的概念和分段线性拟合的建模思路。模型被分为隔离段、横向射流、燃烧室释热分布、主燃烧区反压四个部分。通过压力前推，进行代数的迭代计算，能够快速得到燃烧室释热分布的一维模型。利用实验图像和仿真计算数据，对模型得到的释热分布与燃烧效率进行了验证，模型可适用于隔离段来流2.1马赫以上的工况，且模型结果与仿真结果相关系数达到了0.9以上。

Abstract:

Inordertopredicttheheatreleasedistributioninthecombustorofscramjetengine，focusingonthecombustorwithacavityflameholder，theeffectsofmixingcondition，inflowtemperature，andequivalenceratioontheheatreleasedistributionwerestudied.Theconceptofmaincombustionzoneandpiecewiselinearfit.tingmodelingmethodwereintroduced.Themodelwasdividedintoisolator，transversefueljetflow，combustorheatreleasedistribution，andmaincombustionzonepressure.Throughtheforwardcalculationofpressureandal.gebraiciterativecalculation，theone-dimensionalmodeloftheheatreleasedistributioninthecombustorcanbequicklyobtained.Someofthegraphswerecomparedwithexperimentimagesinordertoverifyhowthemodelfitstheactualprocess.ThemodelissuitablefortheconditionwhentheMachnumberofisolatorinflowisabove2.1，andthecorrelationcoefficientbetweentheresultsfromthemodelandcomputersimulationreachedmorethan0.9.