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首页> 外文期刊>Combustion Science and Technology >DETERMINATION OF PLANCK MEAN ABSORPTION COEFFICIENTS FOR HYDROCARBON FUELS
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DETERMINATION OF PLANCK MEAN ABSORPTION COEFFICIENTS FOR HYDROCARBON FUELS

机译：石油燃料中普朗克平均吸收系数的测定

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摘要

Infrared transmission of propane, n-heptane and propylene samples was measured using Fourier transform infrared spectroscopy (FTIR) for temperatures ≤ 1000 K to facilitate calculation of absorption coefficients of fuel molecules at temperatures representative of non-premixed flame interiors. Spectrally resolved fits of the absorption coefficient data using a semi-empirical quantum-based expression provide a basis for calculating infrared spectra at any temperature. Experimentally-derived Planck mean absorption coefficients (κ_p) of these fuels are compared with that of methane calculated from the HITRAN database since methane absorption has been used to model fuel absorption in fires. κ_p's for propane and heptane have similar characteristics over the entire temperature range. Methane and propylene with their higher proportion of absorption in low frequency bands have peak κ_p at lower temperatures where blackbody radiation intensity peaks near the spectral range of these bands. Propylene with low frequency absorption bands associated with the C=C bond has the highest κ_p at temperatures <600K. N-heptane has the largest κ_p at temperatures ≥ 800 K where blackbody emission intensity peaks near or above the spectral range of the C-H stretching bands. Implications of these results on fuel absorption of radiative heat transfer in flames are discussed.
机译：使用傅里叶变换红外光谱（FTIR）在≤1000 K的温度下测量丙烷，正庚烷和丙烯样品的红外透射率，以便于计算代表非预混火焰内部的温度下燃料分子的吸收系数。使用基于半经验量子的表达式对吸收系数数据进行光谱解析拟合，为计算任何温度下的红外光谱提供了基础。将这些燃料的实验得出的普朗克平均吸收系数（κ_p）与从HITRAN数据库计算出的甲烷的吸收系数进行比较，因为甲烷吸收已被用于模拟火灾中的燃料吸收。丙烷和庚烷的κ_p在整个温度范围内具有相似的特性。甲烷和丙烯在低频带中的吸收比例较高，在较低温度下黑峰辐射强度在这些频带的光谱范围附近达到峰值时出现峰κ_p。在<600K的温度下，具有与C = C键关联的低频吸收带的丙烯具有最高的κ_p。在≥800 K的温度下，正庚烷具有最大的κ_p，其中黑体发射强度在C-H拉伸谱带的光谱范围附近或之上达到峰值。讨论了这些结果对火焰中辐射热传递的燃料吸收的影响。

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