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Numerical studies for performance improvement of a variable geometry dual mode combustor by optimizing deflection angle

机译：通过优化偏转角改善可变几何双模燃烧室性能的数值研究

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As part of our efforts to study the effect of the deflection angle on combustor performance of a variable geometry dual mode combustor, the flow field characteristics and mechanisms of the combustor performance loss, which comprised of compression loss, combustion heat addition loss and expansion loss, were investigated in the variable geometry dual mode combustor numerically with a Mach number of 3, a divergence ratio of 1.76, a fuel equivalence ratio of 0.6, and a deflection angle ranging from 8 to 16. Numerical results indicated that the total pressure recovery coefficient and combustion efficiency increased with the deflection angle and there was a maximum to be obtained at the deflection angle of 12 due to the interaction between the dominant shock resulted by combustion heat release and the additional shock caused by the wedge system. Irreversible entropy generation loss was analyzed specifically in this paper to clarify and describe the combustor performance loss for the variable geometry dual mode combustor. Moreover, thrust-to-drag ratio was utilized to assess the effect of the deflection angle on combustor performance. By taking into account the flow field characteristics and combustor performance characteristics, the high combustor performance of a variable geometry dual mode combustor can be improved by selecting and optimizing the deflection angle. (C) 2017 Elsevier Masson SAS. All rights reserved.
机译：为了研究偏转角对可变几何双模燃烧器燃烧室性能的影响，燃烧室的流场特性和燃烧性能损失的机理包括压缩损失，燃烧热添加损失和膨胀损失，在可变几何双模燃烧器中进行了数值研究，其马赫数为3，发散比为1.76，燃料当量比为0.6，偏转角为8到16。数值结果表明，总压力恢复系数和燃烧效率随偏转角的增加而增加，由于燃烧热释放引起的主要冲击与楔形系统引起的附加冲击之间的相互作用，在偏转角为12时可获得最大值。本文专门分析了不可逆的熵产生损失，以阐明和描述可变几何双模燃烧室的燃烧室性能损失。此外，推力/阻力比用于评估偏转角对燃烧室性能的影响。通过考虑流场特性和燃烧器性能特性，可以通过选择和优化偏转角来改善可变几何双模式燃烧器的高燃烧器性能。 （C）2017 Elsevier Masson SAS。版权所有。

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