Combustion characteristics of a pilot fuel-ignited dual-fuel hydrogen gas engine with nitrogen dilution

IF 6.2 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute Pub Date : 2025-09-19 DOI:10.1016/j.joei.2025.102296

Cicilia Kemunto Mesa, Nobuyuki Kawahara, Yoshimitsu Kobashi

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引用次数: 0

Abstract

This study investigates H₂-diesel dual-fueling for a 781.7 cm³ single cylinder gas engine utilizing N₂ dilution. Parametric analyses were conducted for 1000 rpm speed, 0–47 % N₂ dilution ratios and injection timing from top dead center (TDC) to −16 after TDC. Impacts on key indicators like secondary auto ignition, flame propagation speed and duration, ignition delay, indicated thermal efficiency and emissions were studied. Results revealed that normal and knock combustion was suppressed in favor of PREmixed mixture ignition in the end gas region (PREMIER) combustion which increased by 75 %. N₂ dilution increased the specific heat capacity lowering the peak combustion temperatures which in turn decreased flame propagation speed and increased ignition delay enhancing premixed burning. Indicated thermal efficiency decreased with dilution up to 28 %, then peaked at 41 % dilution, showing a 1.5 % gain over the undiluted case. With increasing dilution, NOx and UHC emissions decreased, while H₂ emissions rose.

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中试燃料点燃氮稀释双燃料氢气发动机的燃烧特性

本研究对781.7 cm3单缸燃气发动机采用N2稀释的h2 -柴油双燃料进行了研究。对1000 rpm转速、0 - 47% N2稀释比和上止点（TDC）至上止点后- 16的注射时间进行参数分析。研究了对二次自动点火、火焰传播速度和持续时间、点火延迟、指示热效率和排放等关键指标的影响。结果表明，正常燃烧和爆震燃烧均得到抑制，而终端气体区（PREMIER）燃烧中预混混合物的点火量增加了75%。N2稀释增加了比热容，降低了燃烧峰值温度，从而降低了火焰传播速度，增加了点火延迟，增强了预混燃烧。表明热效率随着稀释率达到28%而下降，然后在稀释率达到41%时达到峰值，比未稀释的情况增加1.5%。随着稀释度的增加，NOx和UHC排放量减少，而H2排放量增加。

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来源期刊

Journal of The Energy Institute 工程技术-能源与燃料

CiteScore

10.60

自引率

5.30%

发文量

166

审稿时长

16 days

期刊介绍： The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.