CAJ | 학술논문

采用高速纹影系统和定容燃烧弹对预混球形膨胀火焰的胞状不稳定性进行研究，分析火焰胞状不稳定性的表现、原因以及影响因素。研究结果表明：火焰胞状不稳定性主要指不等扩散不稳定和流体力学不稳定；流体力学不稳定的原因为，曲率的关系会使其流线发散或汇聚，因而相应地降低或增加了流场的速度，其主要影响因素为火焰厚度和密度比，表现为火焰前锋面产生裂纹随后出现规则的胞；不等扩散不稳定的原因为前锋面包络的控制体由于热质不等扩散的缘故，主要影响因素为刘易斯数，表现为火焰表面布满不规则的胞。
채용고속문영계통화정용연소탄대예혼구형팽창화염적포상불은정성진행연구，분석화염포상불은정성적표현、원인이급영향인소。연구결과표명：화염포상불은정성주요지불등확산불은정화류체역학불은정；류체역학불은정적원인위，곡솔적관계회사기류선발산혹회취，인이상응지강저혹증가료류장적속도，기주요영향인소위화염후도화밀도비，표현위화염전봉면산생렬문수후출현규칙적포；불등확산불은정적원인위전봉면포락적공제체유우열질불등확산적연고，주요영향인소위류역사수，표현위화염표면포만불규칙적포。
A research on cellular instability of outwardly propagating spherical premixed flame was carried out on constant volume combustion bomb with schlieren method by using high speed camera and data acquisition .The developing process , causes and influ-ence factors of flame cellular instabilities was analyzed .The results showed that the cellular instabilities mainly included unequal diffu-sion instability and hydrodynamic instability .The cause of hydrodynamic instability was that stream lines integrated or diverged due to curvature reason , so the velocity of the flow field increases or decreased .The flame thickness and density ratio of burned to unburned zone were the main influence factors of hydrodynamic instability .The cracks and regular distortions of the flame surface was the main phenomenon .The cause of unequal diffusion instability was that thermal-mass unequal diffusion of the flame front control volume .The Lewis number was the main influence factor , and the phenomenon of unequal diffusion instability was un-regular distortions of the flame surface.