新颖的高温流场红外辐射物性参数计算方法

A Novel Method of Infrared Radiative Parameters Calculation in High Temperature Flow Field

为解决高速飞行器红外辐射特性研究中高温气体辐射参数计算问题,在转动平滑谱带(smeared rotational band,SRB)模型的假设下,首次提出基于贝叶斯估计的跳转马尔科夫链蒙特卡罗(reversible jump Markov chain monte carlo,RJMCMC)方法来计算高温流场中气体组分红外光谱物性参数。仿真计算和实验测量表明,仅需很少的先验知识,且不需要相关跃迁系数,该方法可以很好的估计主要振动跃迁带的位置,所提取的SRB模型参数的变化规律与SRB理论模型结果一致,利用拟合参数计算得到不同温度下谱带积分发射和吸收系数与逐线计算的结果非常近似。

Infrared radiative parameters under high temperature was calculated using RJMCMC method under Bayesian framework presumed Smeared Rotational Band model（SRB）,in order to solve the problem of radiation calculation for high speed vehicle infrared signature research.The process of calculation does not need any database of parameter or priors about transition.The experiment from simulation and measured data demonstrates that the position of vibrational transition have been estimated precisely.Simultaneously,the change law of parameter estimation was consistent with theoretic SRB model,from which the integration of radiative parameters under different temperature approximated the line by line calculation（LBL）result very well.