|
| Experimental Study on Combustion and Emissions in an Ammonia-Diesel Dual-Fuel Engine Based on Injection Strategy |
| DOI：10.13949/j.cnki.nrjgc.2024.03.003 |
| Key Words:Ammonia-diesel dual-fuel Combustion, Injection strategy, Dual diesel injection strategy |
|
| 摘要点击次数: 260 |
| 全文下载次数: 0 |
| Abstract:A dual-fuel engine using ammonia and diesel was modified, based on a heavy-duty diesel engine experimental platform. A set of electronic control ammonia injection systems was installed, with ammonia injected into the intake manifold and diesel directly injected into the diesel cylinders. By varying the diesel injection strategy, combustion and emission char-acteristics of the ammonia-diesel dual-fuel engine was optimized under 1200r/min medium loads with a 50% ammonia energy ratio. Experimental results showed that the slow combustion rate and high ignition temperature of ammonia fuel lead to an asynchronous combustion with diesel in the vicinity of the top dead center of the diesel engine's original injec-tion strategy, results in a "double-peak" heat release curve, leading to lower efficiency in ammonia combustion. By adopting a dual injection strategy for diesel, the ignition timing of diesel can be delayed by advancing the diesel pilot injection timing, which activates the ammonia fuel outside the piston cavity, promoting synchronization between diesel and ammonia combustion. The "double-peak" heat release curve is transformed into a "single-peak" curve, accelerating the combustion rate, shortening the combustion duration, reducing unburned ammonia emissions, and enhancing ammo-nia combustion efficiency. However, excessive advancement of the pilot injection timing may cause diesel wall im-pingement, which is detrimental to the indicated thermal efficiency. |
| 查看/发表评论 下载PDF阅读器 |
|
|
|