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为了研究RBCC亚燃模态的高效稳定燃烧,对小支板及凹腔结合的火焰稳定及燃烧组织方式进行多次试验研究,结果表明,凹腔与支板的火焰稳定及燃烧组织方式能有效地改善燃料的燃烧性能,提升燃烧室压强,凹腔与支板相对位置对燃烧的放热位置及燃烧性能也有影响。为了进一步研究燃烧流场内部参数变化,选取其中一种试验工况进行数值模拟,结果表明,在RBCC混合燃烧模式中,采用支板与凹腔组合的火焰组织及稳定方式,能够在较短距离实现煤油的高效燃烧,获得较好的燃烧性能,并且可以从中发现热力喉道的形成与凹腔的后斜壁收缩有关联,在实现稳定高效燃烧的条件下,获得直扩的双模态燃烧室内较为稳定的热力喉道。
In order to study the high-efficiency and stable combustion of the RBCC sub-combustion mode, a number of experimental studies on the flame stabilization and the combustion organization of the small support and cavity were carried out. The results show that the flame stabilization and combustion organization of the cavity and the support plate are effective To improve the combustion performance of the fuel to enhance the pressure in the combustion chamber, the relative position of the cavity and the support plate has an impact on the heat release position and combustion performance of the combustion. In order to further study the variation of the internal parameters of the combustion flow field and choose one of the experimental conditions for numerical simulation, the results show that in the RBCC mixed combustion mode, the flame structure and the stabilization mode of the combination of the support plate and the cavity can be used in a short distance In order to realize the high-efficiency combustion of kerosene and obtain better combustion performance, it can be found that the formation of thermal throats is related to the back-wall shrinkage of the cavity. Under the conditions of stable and efficient combustion, Indoor more stable thermal throat.