摘要
一氧化氮(NO)对高超声速飞行器本体和流场红外辐射传输有重要影响,而目前HITEMP数据库只能计算70K^3000K温度范围内的谱线参数,同时现有的高温条件下NO配分函数算法一般运算量大、且较少考虑电子基态双重分裂的影响,因此获取更为高效精准的NO辐射参数非常重要。根据乘积近似模型将NO配分函数分解成电子、振动、转动等配分函数,且在计算电子配分函数时考虑了NO电子基态中2个自旋分量的作用,以提高算法的准确性;对于3000K^8000K温度范围内,对振转配分函数乘积进行修正。实验结果表明,在70K^3000K温度范围内,本配分函数与HITEMP数据库的配分函数几乎完全相同,最大误差不超过0.3%,但该算法还可用于计算非平衡态下配分函数;在3000K^8000K温度范围内,该方法取得了与现有的基于求和运算的配分函数计算方法以及实验相近的结果。
Nitric oxide （NO） has significant influences on the infrared radiative transferring of hypersonic vehicle and its flow field, but the HITEMP database can calculate NO＇s parameters only for 70 K-3000 K and at present the available algorithms for calculating NO＇s partition function seldom take the effect of lambda-doubling in electronic ground into account. Therefore, calculation of NO＇s radiative parameters with higher efficiency and accuracy is rather significant. According to the product approximation, the total internal partition function is decomposed into electronic, vibration and rotation partition functions. The fact that NO＇s χ^2II ground state splits into 2 spin components has been considered so as to improve the accuracy. With temperature between 3000 K and 8000 K, the rovibration partition function is rectified. Experiments show that the partition function of the proposed algorithm agrees with total internal partition sums （TIPS） of the HITEMP with temperature between 70 K and 3000 K, with the maximum error being no more than 0.3 %. Moreover, the proposed algorithm can calculate partition functions under non local-thermal equilibrium. Besides when compared with the algorithms based on summation at high temperature as well as experiments, the proposed method has high accuracy.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2014年第11期329-335,共7页
Acta Optica Sinica
基金
国家自然科学基金(61302145
61101185)
