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为了提高超燃冲压发动机中支板/凹腔组合构型燃烧效率,通过数值仿真对采用支板/凹腔四种组合构型的燃烧室流场进行了研究,重点分析了不同组合构型对煤油燃烧性能以及凹腔质量交换特性的影响。结果表明:带后缘支板不仅能够提高主流与凹腔的质量交换律,并且能够扩大支板后部低速回流区及燃烧区域面积,从而使煤油燃烧效率提高2.8%~5.8%;采用双凹腔构型与采用单凹腔构型相比虽然不能提高单个凹腔与主流的质量交换律,但是增大了燃烧室低速回流区及燃烧区域面积,从而使煤油燃烧效率提高了4.5%~8.8%;在相同来流工况下,不同支板/凹腔组合构型燃烧室的总压恢复系数相近,随着来流马赫数增大总压恢复系数随之下降。
In order to improve the combustion efficiency of the combustor / concavity combustor in the scramjet, the flow field in the combustor with the four combinations of support / concavity was studied by means of numerical simulation. The effects of different combinations of configuration pairs Effect of Kerosene Combustion Performance and Cavity Mass Exchange Characteristics. The results show that the trailing edge plate can not only improve the mass exchange law between the mainstream and the cavity, but also increase the area of the low velocity recirculation zone and the combustion area at the back of the plate. As a result, the combustion efficiency of kerosene increases by 2.8% -5.8% Compared with the single cavity configuration, the cavity configuration can improve the combustion efficiency of kerosene by 4.5% -8.8%, although it can not improve the mass exchange law between the single cavity and the mainstream, but increases the area of low velocity recirculation zone and combustion area of the combustion chamber. %. Under the same flow conditions, the total pressure recovery coefficients of combustion chambers with different plate / cavity combinations are similar, and the total pressure recovery coefficient decreases with the increase of Mach number.