Abstract
Ammonia is expected as a hydrogen energy carrier and a carbon-free fuel. Because the combustion intensity of ammonia is weaker than that of hydrocarbon fuels, improvement of combustion intensity is required. In this study, combustion characteristics of ammonia/hydrogen/air flames were investigated using a constant volume combustion chamber and a nozzle-type burner. The laminar burning velocity monotonically increases with hydrogen addition. The Markstein length varies non-monotonically with hydrogen addition. The scale of turbulent flame front wrinkles of smaller hydrogen concentration flames are larger than that of higher ones because of thicker flame thickness of smaller hydrogen concentration flame.
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