Numerical and experimental investigation of improving combustion performance of variable geometry dual-mode combustor
Numerical and experimental investigation of improving combustion performance of variable geometry dual-mode combustor
复制标题
改善变几何双模式燃烧室燃烧性能的数值与实验研究
DOI：
10.1016/j.ast.2017.02.002
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发表时间：
2017
影响因子：
5.6
通讯作者：
Bao Wen
中科院分区：
文献类型：
--
作者：
Feng Shuo;Chang Juntao;Zhang Junlong;Zhang Chenlin;Bao Wen
为了进一步提高变几何双模燃烧器的燃烧性能，在马赫数为3.0、发散比为1.3 ~ 1.8、燃料当量比为0.6 ~ 1.2的条件下，对变几何双模燃烧器的流场特性和燃烧性能损失机理进行了数值和实验研究。本文将不可逆熵增加分析专门推广到变几何双模燃烧室燃烧性能损失机理的研究中。数值和实验结果表明，在一定的燃料当量比下，变几何双模燃烧室壁面静压、总压恢复系数、燃烧效率和推力随散度比的减小而增大，且在稳定余量范围内，散度比为1.3时推力性能最大。因此，认为减小发散比可以进一步提高变几何双模燃烧室的燃烧性能。
As part of our efforts to find ways and means to further improve the combustion performance of variable geometry dual-mode combustor, flow field characteristics and mechanisms of combustion performance losses, which included compression and combustion losses resulted by heat addition, were investigated in variable geometry dual-mode combustor numerically and experimentally with a Mach number of 3.0, a divergent ratio ranging from 1.3 to 1.8 and a fuel equivalence ratio varying from 0.6 to 1.2. Irreversible entropy increase analysis was extended specifically in this paper to study the mechanism of combustion performance loss for the variable geometry dual-mode combustor. Numerical and experimental results indicated that for a given fuel equivalence ratio, the wall static pressure, total pressure recovery coefficient, combustion efficiency and thrust of the variable geometry dual-mode combustor increased with the decreasing of divergent ratio and there was a maximum thrust performance for the divergent ratio of 1.3 within stability margin. It was therefore strongly believed that the combustion performance of a variable geometry dual-mode combustor could be further improved by decreasing divergent ratio.