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Effects of different combustion modes on the thermal efficiency and emissions of a diesel pilot-ignited natural gas engine under low-medium loads

不同燃烧模式下柴油引燃天然气发动机的燃烧特性

  • The 2nd World Congress on Internal Combustion Engines
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Abstract

Research on dual-fuel (DF) engines has become increasingly important as engine manufacturers seek to reduce carbon dioxide emissions. There are significant advantages of using diesel pilot-ignited natural gas engines as DF engines. However, different combustion modes exist due to variations in the formation of the mixture. This research used a simulation model and numerical simulations to explore the combustion characteristics of high-pressure direct injection (HPDI), partially premixed compression ignition (PPCI), and double pilot injection premixed compression ignition (DPPCI) combustion modes under a low-medium load. The results revealed that the DPPCI combustion mode provides higher gross indicated thermal efficiency and more acceptable total hydrocarbon (THC) emission levels than the other modes. Due to its relatively good performance, an experimental study was conducted on the DPPCI mode engine to evaluate the impact of the diesel dual-injection strategy on the combustion process. In the DPPCI mode, a delay in the second pilot ignition injection time increased THC emissions (a maximum value of 4.27g/(kW·h)), decreased the emission of nitrogen oxides (a maximum value of 7.64 g/(kW·h)), increased and then subsequently decreased the gross indicated thermal efficiency values, which reached 50.4% under low-medium loads.

摘要

在“碳达峰”“碳中和”的大背景下,各大发动机制造商越来越关注减少二氧化碳排放,因此对双燃料发动机的研究也变得越来越重要。不同的混合气形成方式决定了不同的燃烧模式,在双燃料发动机中柴油引燃天然气发动机具有显著的排放优势。本研究采用数值模拟和实验相结合的方法,探讨了高压直喷(HPDI)、部分预混压缩点火(PPCI)和双先导喷射预混压缩点火(DPPCI)燃烧模式在中低负荷下的燃烧特性。结果表明,与其他模式相比,DPPCI 燃烧模式的总指示热效率(ITEg)更高而总碳氢化合物(THC)排放更低。由于DPPCI 具有较好的性能,对其进行了进一步的实验研究,以探索双先导喷射策略对燃烧过程的影响。在DPPCI模式下,第二次引燃柴油喷射时间的延迟会增加THC排放,减少氮氧化物的排放,ITEg表现为先升高后降低,在中低负荷下ITEg可以达到50.4%。

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Authors and Affiliations

  1. State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China

    Shou-ying Jin  (靳守营), Jin-ze Li  (李金泽), Zhen-yuan Zi  (字振源), Ya-long Liu  (刘亚龙) & Bin-yang Wu  (邬斌扬)

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  1. Shou-ying Jin  (靳守营)
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  2. Jin-ze Li  (李金泽)
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Contributions

The overarching research goals were developed by WU Bin-yang, LIU Ya-long, and JIN Shou-ying. LIU Ya-long provided the experimental data, and analyzed the measured data. JIN Shou-ying, LI Jin-ze, and ZI Zhen-yuan established the models and calculated. JIN Shou-ying, LI Jin-ze, and ZI Zhen-yuan analyzed the calculated results. The initial draft of the manuscript was written by WU Bin-yang, JIN Shou-ying, and LIU Ya-long. All authors replied to reviewers’ comments and revised the final version.

Corresponding authors

Correspondence to Ya-long Liu  (刘亚龙) or Bin-yang Wu  (邬斌扬).

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Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Foundation item: Project(2017YFE0102800) supported by the National Key R&D Program of China; Project(19JCYBJC21200) supported by the Tianjin Natural Science Foundation, China

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Jin, Sy., Li, Jz., Zi, Zy. et al. Effects of different combustion modes on the thermal efficiency and emissions of a diesel pilot-ignited natural gas engine under low-medium loads. J. Cent. South Univ. 29, 2213–2224 (2022). https://doi.org/10.1007/s11771-022-5084-8

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