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.