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一氧化氮(NO)是高超声速飞行器流场中重要组分,对飞行器本体和流场红外辐射传输有重要影响,因此研究NO有效带宽的快速算法很有必要。根据HITEMP 2010数据库,研究了NO在1~15μm红外波段的谱线线强以及吸收系数分布特征,提出了改进的k分布模型,采用高斯数值方法快速求解;此外分析了吸收系数阈值对g-k曲线以及有效带宽的影响,提出了吸收系数阈值的选取方法。实验结果表明:文中方法计算得到的NO有效带宽与与逐线计算方法结果较为吻合,误差不超过5%;与宽带k分布算法相比,该算法计算效率更高,且当选择合适阈值时精度更高。
Nitric oxide (NO) is an important component in the flow field of hypersonic vehicle, which has an important influence on the infrared radiation transmission of the aircraft body and the flow field. Therefore, it is necessary to study the fast algorithm of NO effective bandwidth. According to the HITEMP 2010 database, the line intensity and absorption coefficient distribution characteristics of NO in the infrared band of 1 ~ 15μm were studied. An improved k-distribution model was proposed and solved by Gauss numerical method. In addition, the absorption coefficient threshold was analyzed for the gk curve, The effective bandwidth of the absorption coefficient threshold proposed method of selection. Experimental results show that the calculated effective bandwidth of NO is in good agreement with that of line-by-line calculation and the error is no more than 5%. Compared with the wideband k-distribution algorithm, the proposed algorithm has higher computational efficiency and accuracy when choosing the appropriate threshold higher.