燃烧产物二氧化碳高温辐射的窄谱带模型参数

Narrow Band Model Parameters of High Temperature Radiation for Carbon Dioxide of Combustion Products

窄谱带模型法与 CG近似及 LS近似结合能够很好处理非灰、非等温、非均匀介质的辐射传输问题 ,在飞行器发动机燃烧室及尾喷焰高温辐射传输问题研究中多被采用。二氧化碳是含碳类推进剂主要的燃烧产物 ,其辐射特性的研究一直受到国内外重视 ,但其现有的窄谱带模型数据不完整或分辨率太低。本文利用最新的高分辨率高温燃气光谱数据库 HITEMP(序列号 :31 5 3) ,并将其中的谱线光谱参数外推到 30 0～ 30 0 0 K的温度范围内 ,计算得到了一个新的、完整的、分辨率较高的二氧化碳窄谱带模型参数库。以本文计算的模型参数为基础 ,采用窄谱带模型计算了各种光学路径下的发射率、穿透率 ,其结果与实验值符合很好。

CG approximation and LS approximation associated with narrow band model can be utilized to deal with radiation heat transfer problem in non-gray,non-isothermal and inhomogeneous media.Therefore,they are broadly adopted in studying high-temperature gas radiation transfer problem in engine combustor and plume of high speed flying vehicles.Carbon dioxide is a primary combustion product of carbonaceous propellant and the close attention has been paid on studying its radiative properties.But some of today's narrow band model parameters are obtained by fitting to experimental data and the spectral resolution is too low;some could not overlay near,middle and far infrared spectral region,or precision of some parameters is too bad;particularly high temperature data of over 2000 K are lacking.In this paper,by making use of the up-to-date high resolution and high temperature flame gas spectral database-HITEMP (serial number:3153),and parameters such as line strength,self-broaded half-width,and air-broaded half-width in HITEMP database being extrapolated to 300～3000 K,new carbon dioxide parameters,such as mean absorption coefficient,line density and mean half-width are obtained.Based on these parameters and narrow band model,the emissivity and transmissivity are evaluated under different temperature,pressure and optical path conditions.Results show a good agreement with Scutaru,Ferriso,Ludwig's experimental values.