Validation of spectral gas radiation models under oxyfuel conditions—Part B: Natural gas flame experiments

Validation of spectral gas radiation models under oxyfuel conditions – Part C: Validation of simplified models

“…The model was recommended as reference model for validation of simplified spectral models. In part B (Becher et al, 2011a) spectral measurements from a turbulent natural gas flame as example for a technical combustion process were compared to simulated spectra based on measured temperature and gas composition profiles. The results revealed the importance of the effect of turbulence-radiation interaction (TRI), which can lead to an increase of radiative heat transfer of up to 75% compared to the radiative heat transfer based only on mean scalar variables.…”

Numerical investigation on oxy-combustion characteristics of a 200MWe tangentially fired boiler

“…Their study focused on the combustion mechanisms or gas radiative models, but did not carry out detailed investigation on the combustion and heat transfer properties. The series of articles by Becher et al [19][20][21] validated the accuracy of existing spectral gas radiative models for oxy-fuel combustion, by comparing them to line-by-line model based on HITIMP2010. [22] The WSGG model from Johansson et al [23] was recommended for calculations of spectral gas radiation in large-scale oxy-fuel combustion simulations.…”

Predicting Radiative Heat Transfer in Oxy-Methane Flame Simulations: An Examination of Its Sensitivities to Chemistry and Radiative Property Models

“…Figures 2-5). Since these extremes are well outside the range of conditions examined in the studies of Becher et al [43] and Kangwanpongpan et al [13] and total emissivities were compared in one study [22] while directionally integrated quantities (radiative flux and its divergence) was compared in the other [13], this study demonstrates the variations in radiative transfer predictions that might result from employing different WSGGM formulations in multiphysics CFD simulations of flames. The different WSGGM considered in this study presents model coefficients for different H 2 O/CO 2 ratios encompassing methane-air and oxy-methane combustion scenarios.…”

“…It is also important to recognize that the results reported in this study provide estimates of the wall radiative fluxes and total radiant power from oxy-methane flames in an environment where turbulence-radiation interactions (TRI) were minimized [21]. The importance of TRI was recognized in a recent study carried out by Becher et al [22] where significant TRI caused considerable variability in radiative transfer predictions and precluded the determination of the most accurate radiative property model. Experimental measurements from confined, laminar (Re 1404) methane flames in oxidizer compositions of 21% O 2 -79% N 2 , 35% O 2 -65% CO 2 , and 50% O 2 -50% CO 2 are first reported in this study, followed by computational fluid dynamic (CFD) simulations of these flames.…”