New multi-parametrical pressurized WSGG model correlations for gaseous radiative heat transfer in high H2O/CO2 molar ratio conditions for sustainable fuel utilization

The utilization of H2 blended natural gas has great significance for advancing large-scale applications of hydrogen energy. Numerical simulation can provide valuable insights into the combustion characteristics of H2 blended natural gas. To calculate the radiative characteristics of H2O/CO2 mixed gas under complex conditions efficiently and accurately in CFD simulation, new multi-parametrical pressurized WSGG correlations were proposed in this study, which introduced a set of parameters that can simultaneously adapt to variations in temperature, pressure and H2O/CO2 molar ratio. The model coefficients are applicable across a wide range of conditions, including a total pressure range of 1∼10 bar, a temperature range of 400∼2500 K, H2O/CO2 molar ratio from 3–5 and partial pressure path lengths from 0.001 to 60 bar·m. The new correlations were validated under one- and two-dimensional cases. The average error of radiative heat flux was less than 3.92% and the average error of radiative heat source was less than 4.32%, while traditional WSGG models developed under standard pressure failed to comprehensively meet the demands. The calculation results indicated that the new multi-parametrical pressurized WSGG correlations can effectively simulate radiative calculations in combustion media under varying pressures and are suitable for the fuel with high H2 blending ratios, which is significant for hydrogen energy utilization.