| 官维,吴杰,吴锋,等.喷油策略和缸内温度调控对大缸径氨柴发动机燃烧和排放的影响[J].内燃机工程,2025,46(4):55-63. |
| 喷油策略和缸内温度调控对大缸径氨柴发动机燃烧和排放的影响 |
| Effects of Fuel Injection Strategy and In-Cylinder Temperature on Ammonia Diesel Dual Fuel Engines |
| DOI：10.13949/j.cnki.nrjgc.2025.04.007 |
| 关键词:氨柴双燃料 氨能量替代比 喷油正时 缸内初始温度 燃烧 排放 |
| Key Words:ammonia diesel dual fuel ammonia energy substitution ratio injectiontiming initial cylinder temperature combustion emission |
| 基金项目:宁波重点研发计划项目（2021Z036）；广西重点研发计划项目（桂科AB25069503，AA23062070）；国家重点研发计划项目（2022YFE0209000） |
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| 摘要:为了提高氨柴双燃料发动机的燃烧效率和指示热效率，降低污染物排放，基于一台大缸径船用发动机，使用三维仿真软件CONVERGE，对不同氨能量替代比和发动机的不同柴油喷射正时及缸内初始温度下的燃烧和排放进行了对比分析。研究发现：随着氨能量替代比的逐渐增加，预混燃烧比例加大，发动机的指示热效率获得改善，碳排放显著降低。但过高的氨能量替代比使得燃烧完成度降低，燃烧效率下降，导致指示热效率降低。适当提前柴油喷油正时可以提升燃烧效率，同时降低NH3和CO排放。提高缸内初始温度改善了燃烧环境，提升了氨燃料的燃烧速率，发动机指示热效率提高的同时，N2O和未燃氨的排放量能够显著降低。在氨能量替代比为40%、柴油喷射正时为-21°、缸内初始温度为338 K时，发动机的指示热效率达到最高51.37%，同时N2O和未燃氨的排放水平非常低。 |
| Abstract:To improve the combustion efficiency and indicated thermal efficiency of ammonia diesel dual-fuel engines while reducing pollutant emissions， based on a large-bore marine engine， the 3D simulation software CONVERGE was used to analyze the combustion and emissions under different ammonia energy substitution ratios， different diesel injection timings and initial cylinder temperatures. The results show that with the gradual increase of ammonia energy substitution ratio and the increase of premixed combustion， the indicated thermal efficiency of the engine is improved， and the carbon emission is significantly reduced. However， the excessively high ammonia substitution ratio reduces the completion of combustion and the combustion efficiency， thereby decreasing the indicated thermal efficiency. When the diesel injection timing is appropriately advanced， the combustion efficiency is improved while the NH3 and CO emissions are reduced. Increasing the initial temperature in the cylinder improves the combustion environment， promotes the combustion rate of ammonia fuel， improves the indicated thermal efficiency of the engine， and significantly reduces N2O and unburned ammonia emissions. At an ammonia substitution ratio of 40%， a diesel injection timing of -21°， and an initial cylinder temperature of 338 K， the engine’s indicated thermal efficiency reached the highest level of 51.37%， while the N2O and unburned ammonia emission levels were very low. |
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