Experimental Study of Combustion Process of NH3 Stratified Spray Using Imaging Methods for NH3 Fueled Large Two-Stroke Marine Engine

lAn NH3 stratified injection was investigated for NH3 fueled large two-stroke marine engine.lAn optically accessible constant volume combustion chamber was used in the experiments.lThe shape of NH3 stratified spray was similar to that of conventional fuel spray.lThe combustion process of NH3 stratified spray flame was clarified from high-speed direct images.lThe NH3 combustion reaction in NH3 stratified spray flame was confirmed by imaging spectroscopy.