Hydrogen-hydrocarbon Turbulent Nonpremixed Flame Structure and Pollutants Formation.pdfVIP

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Hydrogen-hydrocarbon Turbulent Nonpremixed Flame Structure and Pollutants Formation.pdf

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Hydrogen-hydrocarbon Turbulent Nonpremixed Flame Structure and Pollutants Formation

Hydrogen-hydrocarbon Turbulent Nonpremixed Flame Structure and Pollutants Formation F. Tabet-Helal, B. Sarh and I. G?kalp Laboratoire de Combustion et Systèmes Réactifs, Centre National de la Recherche Scientifique, 1C, Avenue de la Recherche Scientifique, 45071 Orléans, Cedex 2, France Abstract Hydrogen-hydrocarbon blend flames have recently received increased attention as alternative fuels for terrestrial and aerospace power generation applications. The combustion modelling of these composite fuels flames is complex. In order to better understand turbulent flames if blend fuels, this study is carried out in which the flame structure and flow field modifications induced by hydrogen addition are investigated numerically in a co-flow axisymetric turbulent non-premixed flame. Experimental data of this flame configuration in the case of 100 % methane which correspond to the equivalence ration of 0.251 (Brookes and Moss, 1999a) are used for model validation. The hydrogen content is varied between 0 % and 50 % of the total volumetric fuel flow while the equivalence ratio is varied from 0.251 to 0.152. The turbulence is modelled with the k-ε closure. The temperature, density and species fields are calculated using detailed chemical mechanism based on the flamelet library approach. Interaction between the gas-phase chemistry and soot chemistry is taken into account. Radiation heat transfer by both soot and radiating gases is predicted using the optically thin approximation. The empirical soot model of Tesner (1971) is used. A NOx post- processor is used for predicting NOx formation. The validation results showed good agreement with the measurements for the mixture fraction, the temperature and the soot volume fraction. The predictions showed that the increase of hydrogen in the mixture decrease pollutants emissions (both CO and Soot). However, NO and NOx emissions increase because of the rise of the flame temperature with hydrogen addition