Flame kernel characterization of laser ignition of natural gas–air mixture in a constant volume combustion chamber
Flame kernel characterization of laser ignition of natural gas–air mixture in a constant volume combustion chamber
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DOI：
10.1016/j.optlaseng.2011.04.015
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发表时间：
2011-09
影响因子：
4.6
通讯作者：
D. Srivastava;Kewal Dharamshi;A. Agarwal
中科院分区：
文献类型：
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作者：
D. Srivastava;Kewal Dharamshi;A. Agarwal
本文对天然气-空气混合气的激光点火进行了研究。实验是在定容燃烧室中进行的，模拟了点燃式发动机压缩冲程结束时的工况。该室模拟发动机燃烧室条件，除了空气燃料混合物的湍流。它有四个光学窗口在直径相对的位置，这是用于激光点火和光学诊断同时进行。所有实验均在10巴室压力和373 K室温度下进行。利用高速CMOS摄像机，采用阴影技术对燃烧初期的燃烧现象进行了可视化。研究了不同相对空燃比（λ=1.2−1.7）下可燃燃料-空气混合物的火焰核发展，并询问图像以了解火焰前缘的时间传播。记录并分析了燃烧室内的压力-时间历程。这些数据是有用的，在表征的天然气-空气混合物的激光点火，并可用于开发一个适当的激光点火系统，用于商业用途的SI发动机。
In this paper, laser-induced ignition was investigated for compressed natural gas–air mixtures. Experiments were performed in a constant volume combustion chamber, which simulate end of the compression stroke conditions of a SI engine. This chamber simulates the engine combustion chamber conditions except turbulence of air–fuel mixture. It has four optical windows at diametrically opposite locations, which are used for laser ignition and optical diagnostics simultaneously. All experiments were conducted at 10 bar chamber pressure and 373 K chamber temperature. Initial stage of combustion phenomena was visualized by employing Shadowgraphy technique using a high speed CMOS camera. Flame kernel development of the combustible fuel–air mixture was investigated under different relative air–fuel ratios (λ=1.2−1.7) and the images were interrogated for temporal propagation of flame front. Pressure-time history inside the combustion chamber was recorded and analyzed. This data is useful in characterizing the laser ignition of natural gas–air mixture and can be used in developing an appropriate laser ignition system for commercial use in SI engines.