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首页> 外文期刊>International Journal of Heat and Mass Transfer >Engineering procedure for calculating the transfer of the selective radiation of molecular gases
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Engineering procedure for calculating the transfer of the selective radiation of molecular gases

机译：计算分子气体选择性辐射传递的工程程序

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摘要

A procedure for calculating radiation transfer along strongly nonisothermal paths is presented successively. It is orientated to the estimation of transmission and self-radiation of the products of combustion of hydrocarbon fuels. The procedure is based on a new approach to averaging spectral parameters by introducing distribution of lines in a given spectral interval over the energies of lower states and matrix elements. Practically it means that the combination of all spectral lines in the preset frequency is substituted by a combination of J groups of lines with averaged values of quantum mechanical characteristics. This approach is intermediate between one-group description with the use of s/d, γ/d and exact account of each line. A multigroup model is generalized for the cases of vibrational nonequilibrium state and calculations of transmission within the limits of a filter. An error of calculation of the spectral characteristics of molecular gases in the spectral interval of 2-25 μm does not exceed l0/100 for a two-group model, i.e. by means of six parameters, in the temperature range T = 250-l000 K, and l2/100 for a three-group model, i.e. by means of 9 parameters. in the temperature range T = 250-2500 K. The calculated parameters of the three-group model are presented for CO_2 in the 4.3 and 2.7 μm bands, CO in the 4.6 μm band and H_2O in the range 2-l0 μm.
机译：依次介绍了计算沿强非等温路径的辐射传输的过程。它旨在估算碳氢燃料燃烧产物的传输和自辐射。该过程基于一种新的方法，该方法通过在给定的光谱间隔中引入线在较低态和矩阵元素的能量上的分布来平均光谱参数。实际上，这意味着将预设频率中所有频谱线的组合替换为具有量子力学特性平均值的J组线的组合。该方法介于使用s / d，γ/ d的一组描述和每行的准确说明之间。对于振动非平衡状态和在滤波器范围内的透射率计算，建立了一个多组模型。对于两组模型，即通过六个参数，在温度范围T = 250-1000 K中，在2-25μm的光谱间隔内计算分子气体的光谱特征的误差不超过l0 / 100 ，对于三组模型，则为l2 / 100，即通过9个参数。在T = 250-2500 K的温度范围内。针对4.3和2.7μm波段的CO_2、4.6μm波段的CO_2和2-l0μm的H_2O给出了三组模型的计算参数。

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