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首页> 外文会议>ASME(American Society of Mechanical Engineers) Turbo Expo vol.1; 20060506-11; Barcelona(ES) >IGNITION OF LEAN CO/H_2/AIR MIXTURES AT ELEVATED PRESSURES
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IGNITION OF LEAN CO/H_2/AIR MIXTURES AT ELEVATED PRESSURES

机译：高压下稀燃CO / H_2 /空气混合物的点火

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摘要

Shock-tube ignition delay time experiments and chemical kinetics model calculations were performed for several fuel blends of carbon monoxide and hydrogen in air at elevated pressures. Due to the interest in coal-derived fuels, namely syngas, these data are important for characterizing the ignition and oxidation of possible fuel blends used in gas turbines and for the validation of chemical kinetics models. Three lean, CO/H_2 (80/20%, 90/10%, and 95/5% by volume) fuel blends in air were studied behind reflected shock waves at temperatures between 929 and 1304 K and pressures ranging from 1.7 to 15 atm. Ignition delay times were monitored using chemiluminescence emission from excited hydroxyl radicals. Results exhibit the second-explosion limit behavior from hydrogen oxidation kinetics at low temperatures and high pressures for all mixtures. In addition, comparisons of modeling results and experimental data show good agreement for the entire temperature range at high pressure and poor agreement with the data at low temperatures in the intermediate pressure regimes. Ignition and reaction sensitivity analyses indicate that the H + O_2 + M = HO_2 + M termination reaction is important at all conditions herein, and the early formation of HO_2 suppresses the growth of the ignition-enhancing radicals H and OH.
机译：在高压下，对空气中一氧化碳和氢气的几种燃料混合物进行了冲击管点火延迟时间实验和化学动力学模型计算。由于对源自煤的燃料（即合成气）的兴趣，这些数据对于表征燃气轮机中可能使用的燃料混合物的着火和氧化特性以及验证化学动力学模型非常重要。在温度为929至1304 K，压力为1.7至15 atm的反射冲击波之后，研究了空气中三种稀薄的CO / H_2（体积比为80/20％，90/10％和95/5％）的燃料混合物。使用来自激发的羟基的化学发光发射来监测点火延迟时间。结果表明，所有混合物在低温和高压下的氢氧化动力学都具有第二爆炸极限行为。此外，对模型结果和实验数据的比较表明，在高压下整个温度范围内的一致性很好，而在中间压力范围内与低温下的数据一致性很差。点火和反应敏感性分析表明，在本文中的所有条件下，H + O_2 + M = HO_2 + M终止反应都很重要，并且HO_2的早期形成抑制了点火增强基团H和OH的生长。

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