Combustion Characteristics Coupled with Direct Water lnjection through Double-Needle Type Injector

概要

論文の詳細を見る
Direct water injection (DWI) seems to be a promising solution for NOx reductions from marine diesels thanks to its wide flexibility in water injection. Its true potential, however, remains uncertain because both numerical and experimental investigations are necessary to determine the best injection pattern, which can balance greater NOx reduction and less thermal efficiency loss especially for two-stroke diesel engines with peripheral injector location. In this study, a double-needle single-injector type DWI system was tested in a two-stroke engine with peripheral injector layout to evaluate its NOx reduction capability under the existence of swirling flow. Its effect on flame temperature was investigated experimentally by flame temperature measurement and numerically by CFD simulation. It was found that injected water affected fuel spray penetration and its air entrainment around spray tip. For tested engine configuration, it is found simultaneous fuel and water injection was most effective in reducing NOx emission.
社団法人日本マリンエンジニアリング学会の論文