TED-AJ03-144 EFFECTS OF FLAME STRETCH ON LAMINAR METHANE FLAMES WITH HYDROGEN ADDITION
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There has been much recent attempt at the operation of engines on gaseous fuels, which has been motivated largely by the need to produce engines that can comply with the ever more demanding regulations for cleaner exhaust emissions. In this context, natural gas is a potential alternative to gasoline due to lower overall pollutant emissions and more excellent fuel economy. To improve these advantages further, the lean burning method of natural gas is receiving increased attention. In past studies, it has been suggested that a hydrogen addition to hydrocarbon mixtures improves the lean burning characters, which can be due to the fact that hydrogen can sustain vigorous burning at lower temperatures compared to hydrocarbons. In our previous studies for outwardly propagating flames in a constant volume vessel, hydrogen addition was found to be effective in improving the lean burning not only for laminar flames but also for turbulent flames on fuel-lean sides, as seen in Fig. A-1 (a) where S^0_u and S_T are laminar and turbulent burning velocities, respectively, u' is turbulent intensity, and δ is the volume fraction of the added hydrogen in the whole fuel. In addition the effect of hydrogen addition was found to become weaker near stoichiometric condition, as seen in Fig. A-1 (b). Although qualitative explanation was made to some extent in terms of interactions between hydrogen addition and flame stretch, quantitative treatment has not been given yet. In this study, the effect of hydrogen addition to methane flames over a wide range of equivalence is investigated with a presence of flame stretch experimentally and numerically to quantify this effect. The stretch effect is interpreted in terms of Markstein number, which means non-dimensional sensitivity of burning velocity to flame stretch. As a result, it is found that the results of experiment and calculation exhibit the same trends, being explained by preferential-diffusion of lighter reactants and hydrogen addition can change Markstein number, as seen in Fig. A-2,resulting in influence on turbulent burning velocities for outwardly propagating flames.[figure]
- 一般社団法人日本機械学会の論文
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