4-4-3　水素/空気乱流非予混合火炎LESにおける汚染物質NOの予測精度に及ぼす化学的メカニズムの低減化

抄録

Reduction of detailed chemical kinetic mechanism GRI-3.0 was conducted to provide an accurate hydrogen/air combustion prediction with affordable computational cost. The mechanism reduction procedure involves a gradual exclusion of relatively insignificant species and reactions based on fuel properties using the open-source chemistry toolkit Cantera. Several reduced mechanisms were subsequently employed in large eddy simulation of hydrogen/air turbulent non-premixed flame. The thermochemical data measured from combustion case H3 of the model burner developed by the German Aerospace Center were used to validate simulation results. Subgrid scale closure of the turbulence-chemistry interaction term was approximated by a partially stirred reactor model. A comparison of the original detailed and reduced mechanism was made with respect to simulated temperature and species mass fraction. The relatively high prediction accuracy of pollutant NO was highlighted in a detailed mechanism. Finally, the effects of mechanism reduction on simulated NO prediction and the corresponding change in computational cost were discussed.