Laminar-flame instabilities in a taylor-couette combustor
Laminar-flame instabilities in a taylor-couette combustor
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泰勒库埃特燃烧器中的层流火焰不稳定性
DOI：
10.1016/s0010-2180(99)00145-5
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发表时间：
2000
影响因子：
4.4
通讯作者：
R. Aldredge
中科院分区：
文献类型：
--
作者：
V. Vaezi;R. Aldredge
本文对Taylor-Couette燃烧室中的预混火焰传播进行了实验研究，以考察层流火焰不稳定性对火焰上游燃烧速度和流场特性的影响。最初褶皱的环形火焰向下传播，远离燃烧室的开口端，被发现经历第一减速和平坦化，然后加速和增强表面的扭曲，而火焰的上游的轴向和周向速度波动的强度，最初可以忽略不计，强烈放大。在贫和化学计量的甲烷-空气混合物的传播过程中记录的火焰速度的演变是在较早的实验中发现的向下丙烷-空气火焰传播管中的定性协议。它是确定的初级和次级层流火焰不稳定性与声波和化学热释放率之间的耦合支配的发展，在TC燃烧室中的火焰速度和上游流场，如在早期的实验中发现的，并在理论上预测为向下火焰传播管。结果是第一个描述层流火焰不稳定性在TC燃烧室，并确定与二次声学不稳定性的发展和增长的横向声波。
Premixed-flame propagation in a Taylor-Couette combustor has been studied experimentally in order to examine the influence of laminar-flame instabilities on the burning velocity and flow-field properties upstream of the flame. An initially wrinkled annular flame propagating downward, away from the open end of the combustor, is found to undergo first deceleration and planarization and then acceleration and enhanced surface wrinkling, while intensities of axial and circumferential velocity fluctuations upstream of the flame, initially negligible, are strongly amplified. The evolution of flame speeds recorded during propagation in lean and stoichiometric methane–air mixtures is in good qualitative agreement with that found in earlier experiments of downward propane–air flame propagation in tubes. It is determined that primary and secondary laminar-flame instabilities associated with the coupling between acoustic waves and the rate of chemical heat release govern the evolution of both the flame-speed and the upstream flow field in the TC combustor, as was found in earlier experiments and predicted theoretically for downward flame propagation in tubes. The results are the first to describe laminar-flame instabilities in a TC combustor and to identify the development and growth of transverse acoustic waves associated with the secondary acoustic instability.