中文摘要：

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.

英文摘要：

An integrated experiment system,used for the investigation of single droplet combustion characteristics under acoustic oscillation,was established.The experiments on the combustion process of droplet under acoustic oscillation were carried out and the characteristics of flame structure and shape under acoustic oscillation were analyzed.An unsteady combustion model in acoustic oscillation environment was established,and the influences of oscillation frequency,amplitude,chamber average pressure and temperature on combustion characteristics were studied.The study shows that the steady of flame was destroyed in acoustic oscillation environment,the shape of flame showed a variety of deformation and migration,and the position of flame pressents the phenomenon of ＂migrationrecovery＂ repeatedly.Increasing the frequency and amplitude could promote the oscillation of droplet combustion rate,and the combustion rate would increase with the increase of chamber average pressure.Increasing the chamber temperature could significantly improve droplet combustion,and without affecting the coupling of acoustic oscillation and combustion rate.