Effect of spark timing on combustion and emissions of a hydrogen direct injection stratified gasoline engine. (23rd February 2017)

• Record Type: Journal Article
• Authors: Shi, Weibo; Yu, Xiumin; Zhang, Henry; Li, Haoyan
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 8(2017)
• Page Start: 5619
• Page End: 5626
• Publication Date: 2017-02-23
• Subjects: Combustion -- Emission -- Stratified -- Spark timing -- Hydrogen-gasoline engine; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2016.02.060
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The effect of spark timing on combustion and emissions of a hydrogen direct injection stratified gasoline engine was investigated. The engine was operated at 1500 rpm and excess air ratio at 1.2. It was found that when the hydrogen volume fraction was raised from 0% to 10%, and the hydrogen injection timing was 110 °CA BTDC a good stratified effect was achieved. The spark timing was varied from 4 to 16 °CA BTDC. This test demonstrated that the brake thermal efficiency first rose and then fell with the spark advance angle increased. In addition, it increased with the increase of hydrogen volume fraction. Postponing the spark timing caused the maximum instantaneous heat release rate increase. The peak cylinder pressure and the maximum rate of pressure rise increased with spark advance angle increase. Postponing the spark timing also caused NOx, HC and CO emissions to decrease. When the hydrogen volume fraction increased, the NOx emissions rose and the HC and CO emissions dropped. Highlights: A hydrogen direct injection gasoline intake port injection stratified engine is used. A good stratified effect is displayed at 110 °CA BTDC hydrogen injection timing. Brake thermal efficiency first rise and then fall with the spark advance increase. Postponing the spark timing causes NOx, HC and CO emissions decrease. With hydrogen volume fraction increase NOx emissions rises and HC emissions drops.