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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental investigation of dynamics of premixed acetylene–air flames in a micro-combustor
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Experimental investigation of dynamics of premixed acetylene–air flames in a micro-combustor

机译：微型燃烧室中乙炔-空气预混火焰动力学的实验研究

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This paper describes a detailed experimental study performed to investigate the flame propagation behaviour of premixed flames in micro-channels. A novel, modular, stackable micro-combustor was developed for this purpose. For a chosen planar channel geometry, the flow condition and the mixture equivalence ratio of premixed acetylene–air were varied to investigate various modes of operation. Three different modes of operation were observed; they were (i) stable periodic operation – consisting of ignition, flame propagation, flame extinction, and re-ignition, (ii) a-periodic operation, and (iii) anchored flame condition. The present work also aims to provide quantitative information on the dynamics of premixed acetylene–air flames propagating inside micro-channels. A novel measurement approach based on OH chemiluminescence measurements employing a single photomultiplier unit was developed for this purpose. The data recorded were post processed using an in-house developed MATLAB code to evaluate the mean flame propagation speed measured between three different spatial locations along the length of the micro-channel. The results from the flame propagation speed measurements performed during ‘periodic’ mode of operation indicated that the flame travelled at higher propagation speed in the mid-length region of the channel compared to that at the initial entry point, suggesting flame acceleration. This flame acceleration could be attributed to a situation where the flame experienced different local equivalence ratio conditions at different upstream locations. The results suggest that after completion of a cycle of operation consisting of ignition, flame propagation and flame extinction, the fresh mixture that filled the channel was diluted with the exhaust gas from the previous cycle. This pocket of diluted mixture convected downstream with time, thus enabling the spatial variation in local equivalence ratio along the micro-channel.
机译：本文介绍了一项详细的实验研究，以研究预混合火焰在微通道中的火焰传播行为。为此目的，开发了一种新颖的，模块化的，可堆叠的微型燃烧器。对于选定的平面通道几何形状，改变了预混合乙炔-空气的流动条件和混合当量比，以研究各种运行模式。观察到三种不同的操作模式;它们是（i）稳定的定期运行-包括点火，火焰传播，火焰熄灭和重燃，（ii）非周期性运行，以及（iii）固定火焰状况。本工作还旨在提供有关在微通道内传播的预混合乙炔-空气火焰动力学的定量信息。为此目的，开发了一种基于OH化学发光测量的新颖测量方法，该化学发光测量使用单个光电倍增管单元。使用内部开发的MATLAB代码对记录的数据进行后处理，以评估沿微通道长度在三个不同空间位置之间测得的平均火焰传播速度。在“定期”运行模式下进行的火焰传播速度测量结果表明，与初始入口点相比，火焰在通道中部区域的传播速度更高。火焰加速可以归因于火焰在不同上游位置经历不同的局部当量比条件的情况。结果表明，在完成包括点火，火焰传播和火焰熄灭的操作循环后，将充满通道的新鲜混合物用上一循环的废气稀释。稀释后的混合物随时间流向下游，从而使沿微通道的局部当量比发生空间变化。

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