In this paper, the effects of direct water injection (WI) on characteristics of combustion and emission for a hydrogen (H₂)-fueled spark ignition (SI) engine were experimentally investigated. The experiments conducted under different amounts of water injection (AWI) and varied water injection timing (WIT). The experimental results showed that in-cylinder pressure decreased, indicated thermal efficiency (ITE) increased, and the flame development (CA0-10) and propagation (CA10-90) periods prolonged when AWI raised. When AIW grew to 4.5 mg/cycle, Nitrogen oxides (NOx) expelled from the original engine decreased by 53.7% when excess air ratio (λ) was 1.15. Early WIT had positive effects on the reduction of NOx emissions. When WIT retarded, in-cylinder pressure increased, ITE decreased and CA0-10 and CA10-90 shortened, NOx emissions rapidly increased.

本文研究了直接注水（WI）对氢（H ₂）燃料火花点火（SI）发动机燃烧和排放特性的影响。实验在不同的注水量（AWI）和不同的注水时间（WIT）下进行。实验结果表明，当AWI升高时，缸内压力降低，表明热效率（ITE）增加，并且火焰发展（CA0-10）和传播（CA10-90）的时间延长。当AIW增至4.5 mg / cycle时，当过量空气比率（λ）时，从原始发动机排出的氮氧化物（NOx）降低了53.7％。）为1.15。早期的WIT对减少NOx排放有积极影响。当WIT延迟时，缸内压力升高，ITE降低，CA0-10和CA10-90缩短，NOx排放迅速增加。