Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 34, Issue 7, Pages 3145-3155Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2009.01.059
Keywords
Hydrogen-enriched natural gas; Nitrogen diluent; Constant volume combustion bomb; Laminar burning velocity; Flame stability
Categories
Funding
- National Natural Science Foundation of China [50606029]
- National Basic Research Program [2007CB210006]
- Scientific Research Foundation for ROCS
- State Education Ministry
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Flame propagation of premixed nitrogen diluted natural gas/hydrogen/air mixtures was studied in a constant volume combustion bomb under various initial pressures. Laminar burning velocities and Markstein lengths were obtained for the diluted stoichiometric fuel/air mixtures with different hydrogen fractions and diluent ratios under various initial pressures. The results showed that both unstretched flame speed and unstretched burning velocity are reduced with the increase in initial pressure (except when the hydrogen fraction is 80%) as well as diluent ratio. The velocity reduction rate due to diluent addition is determined mainly by hydrogen fraction and diluent ratio, and the effect of initial pressure is negligible. Flame stability was studied by analyzing Markstein length. It was found that the increase of initial pressure and hydrogen fraction decreases flame stability and the flame tends to be more stable with the addition of diluent gas. Generally speaking, Markstein length of a fuel with low hydrogen fraction is more sensitive to the change of initial pressure than that of a one with high hydrogen fraction. (C) 2009 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
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