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>Effect of Overall Equivalence Ratio on Minimum Nitric Oxide Emission Index in Laminar and Turbulent Partially Premixed Flames
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Effect of Overall Equivalence Ratio on Minimum Nitric Oxide Emission Index in Laminar and Turbulent Partially Premixed Flames
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机译：Effect of Overall Equivalence Ratio on Minimum Nitric Oxide Emission Index in Laminar and Turbulent Partially Premixed Flames
NO formation in laminar and turbulent partially premixed flames is studied as a function of the amount of air introduced into both the central fuel tube and the annular co-flow air passage of a concentric tube burner. The fuel tube equivalence ratio (#x3C6;B) is varied from 1.0 to 10, while the overall equivalence ratio (#x3C6;o) is varied from 0.3 to 0.9. Surprisingly, for both the laminar and turbulent flames, absolute EINOxlevels tend to decrease with increasing #x3C6;o. Moreover, for each #x3C6;o, EINOx, displays a minimum at an intermediate value of #x3C6;B. However, for the laminar flames, the greatest relative EINOxminimium is observed for #x3C6;B= 2.5 at #x3C6;o#x2248; 0.7. Similarly, for the turbulent flames, the greatest relative EINOxminimum is observed for #x3C6;B= 1.6 at #x3C6;o#x2248; 0.6. In both cases, the greatest reduction in EINOxas #x3C6;orises occurs for #x3C6;Bvalues greater than those at minimum EINOx.
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