Parameter optimization for full-spectrum model compatible with inhomogeneous gas mixtures and non-gray walls

An optimization platform for parameters of multi-scale multi-group full-spectrum k-distribution model (MSMGFSK), including wavenumber subinterval grouping of absorption spectra of H20 and CO2 and Gauss quadrature scheme, was established. The main idea was to select best parameter combination of MSMGFSK model based on its weighted calculation errors in 1D cases, using calculation results of line-by-line (LBL) model as benchmark. To fit thermal protection scenarios in high temperature fluid machines, the ID cases was constructed to calculate radiative heat exchange between combustion gases with severe non-uniformities of temperature and composition and gray or non-gray walls on their two sides, which were made of various metal materials with different surface states. Calculation result for thermal imaging in a 3D case indicates that the optimized MSMGFSK model was much better than the one used in previous work in both calculation accuracy and efficiency.