喷射速率型线对氨-柴双燃料发动机燃烧过程的影响
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TK429

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教育部"春晖计划"合作科研项目(HZKY20220239); 河北省高等学校科学技术研究项目(QN2023224)


Effects of the injection rate profile on the combustion process of ammonia/diesel dual-fuel engines
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    摘要:

    面对全球气候变暖的压力,在内燃机中使用无碳燃料减少排放受到了广泛关注。为了研究柴油喷射策略对氨-柴双燃料发动机的燃烧以及排放特性。本文以Caterpillar 3401柴油发动机为研究对象,利用CONVERGE软件建立仿真模型,研究了在40%氨能分数、相同喷油量和喷油持续期的条件下不同喷射速率型线(梯形、楔形、斜面、三角形和矩形)对氨-柴双燃料发动机燃烧及排放特性的影响。研究表明:柴油喷射速率型线对柴油、氨气及空气的混合有着显著影响,从而影响燃烧及排放。当喷射速率型线为梯形时,在喷油中期喷射速率较高并且氨-柴混合时间较长,使得氨-柴混合更加均匀,相应的未燃氨的排放最低。相较于矩形喷射速率型线,梯形、楔形、斜坡形和三角形喷射速率型线指示平均压力分别提高4.36%、0.76%、1.09%、3.08%。由于最高温度差异较小,导致每种喷射速率型线下的氮氧化物变化较小。本文提出了一种改善氨-柴双燃料发动机燃烧及排放性能的喷射速率型线方案。

    Abstract:

    In the face of the pressure of global warming, the use of carbon-free fuels in internal combustion engines to reduce emissions has received extensive attention. In order to study the combustion and emissions characteristics of ammonia/diesel dual-fuel engine with diesel injection strategy. In this paper, taking Caterpillar 3401 diesel engine as the research object, a simulation model was established with CONVERGE software to study the effects of different injection rate profiles (trapezoid, wedge, slope, triangle and rectangle) on combustion and emissions characteristics of ammonia/diesel dual-fuel engine under the conditions of 40% ammonia energy fraction, the same fuel injection volume and fuel injection duration. The results show that the diesel injection rate profile has a significant effect on the mixture of diesel, ammonia and air, thus affecting combustion and emissions. When the injection rate profile is trapezoid, the injection rate is higher in the injection stage and the mixing time of ammonia and diesel is longer, which makes the ammonia-diesel mixture more uniform, and the corresponding unburned ammonia emissions is lowest. Compared with the rectangle injection rate profile, the indicated mean effective pressure of the trapezoidal, wedge, slope and triangle injection rate profiles increases by 4.36%, 0.76%, 1.09% and 3.08%, respectively. Due to the small difference in maximum temperature, which resulted in very little variation in nitrogen oxides for each injection rate profiles. In this paper, a scheme of injection rate profile for improving combustion and emissions performance of ammonia-diesel dual fuel engine is presented.

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史程,程腾飞,石磊,等. 喷射速率型线对氨-柴双燃料发动机燃烧过程的影响[J]. 科学技术与工程, 2024, 24(28): 12143-12151.
shicheng, Cheng Tengfei, Shi Lei, et al. Effects of the injection rate profile on the combustion process of ammonia/diesel dual-fuel engines[J]. Science Technology and Engineering,2024,24(28):12143-12151.

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  • 收稿日期:2023-12-28
  • 最后修改日期:2024-08-03
  • 录用日期:2024-03-21
  • 在线发布日期: 2024-11-05
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