压力振荡环境下偏二甲肼液滴的燃烧特性

发布时间：2018-10-26 15:12

【摘要】：设计了压力振荡环境液滴燃烧实验系统,开展了压力振荡环境下液滴燃烧过程实验研究,分析了压力振荡环境下液滴燃烧火焰结构的形态特点,建立了压力振荡环境下液滴燃烧模型,并基于该模型考察了振荡频率、振荡幅值、燃烧室平均压力及温度对燃烧特性的影响规律.结果表明,压力振荡环境显著影响了燃烧火焰的稳定性,使得火焰形态发生了多种形变和偏移;压力振荡环境下液滴燃烧火焰位置不断出现"偏移——恢复"的反复过程,且这种反复状态贯穿液滴燃烧过程的始终.增加振荡频率和振荡幅值加剧了液滴燃烧速率的振荡,但并没有改变其平均值,因而不同频率与振幅下液滴直径变化趋势并无明显区别;增加燃烧室平均压力对燃烧过程具有明显的促进作用,大幅提高了燃烧速率;增加燃烧室温度能够显著促进液滴燃烧,使得液滴燃烧速率和表面燃烧流率迅速增加,且不会加剧压力振荡与燃烧速率的耦合.
[Abstract]:The experimental system of droplet combustion in pressure oscillation environment was designed, and the experimental study of droplet combustion process under pressure oscillation environment was carried out, and the morphological characteristics of droplet combustion flame structure under pressure oscillation environment were analyzed. The model of droplet combustion under pressure oscillation environment is established. Based on the model, the effects of oscillation frequency, oscillation amplitude, the average pressure of combustion chamber and temperature on combustion characteristics are investigated. The results show that the combustion flame stability is significantly affected by the pressure oscillation environment, resulting in a variety of deformation and migration of flame morphology. Under the pressure oscillation environment, the repeated process of "shift-recovery" occurs continuously in the flame position of the droplet combustion, and this repeated state runs through the whole process of the droplet combustion. Increasing the oscillation frequency and amplitude intensifies the oscillation of the droplet combustion rate, but does not change its average value, so there is no obvious difference in the variation trend of droplet diameter under different frequencies and amplitudes. Increasing the average pressure of the combustor can obviously promote the combustion process and increase the combustion rate greatly. Increasing the temperature of combustion chamber can significantly promote the droplet combustion, make the droplet combustion rate and surface combustion flow rate increase rapidly, and do not aggravate the coupling of pressure oscillation and combustion rate.
【作者单位】：装备学院研究生院;装备学院航天装备系;
【基金】：国家自然科学基金资助项目(91441123)
【分类号】：TK16

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