喷氢比例和定时对氢柴油双直喷发动机燃烧和排放特性的影响

钱毅; 鹿盈盈; 王梦; 裴毅强

doi:10.7652/xjtuxb202512018

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喷氢比例和定时对氢柴油双直喷发动机燃烧和排放特性的影响

更新时间：2025-12-08

- 喷氢比例和定时对氢柴油双直喷发动机燃烧和排放特性的影响
- Influence of Hydrogen Injection Ratio and Timing on the Combustion and Emission Characteristics of Hydrogen-Diesel Dual Direct Injection Engines
- 西安交通大学学报 2025年59卷第12期页码：203-215
- 作者机构：
- 作者简介：
  
  作者简介：钱毅（2001—），男，硕士生；
  鹿盈盈（通信作者），女，副教授，硕士生导师。
- 基金信息：
  
  江苏省高等学校基础科学（自然科学）研究重大项目(自然科学25KJA470005);先进内燃动力全国重点实验室开放研究项目(K2023-01);江苏省研究生科研与实践创新计划项目。(SJCX25_0572)
- DOI：10.7652/xjtuxb202512018
  中图分类号： TK422
- 收稿：2025-06-09，
  
  纸质出版：2025-12-10
- 稿件说明：
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钱毅, 鹿盈盈, 王梦, 等. 喷氢比例和定时对氢柴油双直喷发动机燃烧和排放特性的影响[J]. 西安交通大学学报, 2025,59(12):203-215.

QIAN Yi, LU Yingying, WANG Meng, et al. Influence of Hydrogen Injection Ratio and Timing on the Combustion and Emission Characteristics of Hydrogen-Diesel Dual Direct Injection Engines[J]. Journal of Xi'an Jiaotong University, 2025, 59(12): 203-215.
钱毅, 鹿盈盈, 王梦, 等. 喷氢比例和定时对氢柴油双直喷发动机燃烧和排放特性的影响[J]. 西安交通大学学报, 2025,59(12):203-215. DOI： 10.7652/xjtuxb202512018.

QIAN Yi, LU Yingying, WANG Meng, et al. Influence of Hydrogen Injection Ratio and Timing on the Combustion and Emission Characteristics of Hydrogen-Diesel Dual Direct Injection Engines[J]. Journal of Xi'an Jiaotong University, 2025, 59(12): 203-215. DOI： 10.7652/xjtuxb202512018.

摘要

为深入探究喷氢参数对氢柴油双直喷发动机性能的影响规律，运用数值模拟方法对重型柴油机大负荷工况氢柴油双直喷燃烧模式进行探索，研究了喷氢比例和喷氢定时对缸内燃烧和排放特性的影响。首先，在纯柴油原机上构建喷氢管模型，实现氢柴油双直喷燃烧模式；其次，探究不同喷氢比例对燃烧及排放特性的影响；最后，基于最优喷氢比例，进一步分析喷氢定时对燃烧过程与污染物生成的作用规律。研究结果表明：氢气的引入可显著改变燃烧重心分布，使浓混合气区由燃烧室凹坑上移至缸盖部位；适度增加喷氢比例可显著提前燃烧重心并降低排气损失和活塞传热损失，提升指示热效率；喷氢定时的推迟可提高缸压峰值，提前燃烧重心，避免氢气进入侧隙，降低排气损失，提升指示热效率，但高温条件会加剧NO

的生成。优化后的喷氢方案为喷氢比例20%、喷氢定时为上止点前20°曲轴转角，与纯柴油原机相比，该方案指示热效率提高了1.37%，碳烟比排放降低了41.33%，但NO

比排放增加了12.86%。研究明确了喷氢比例和定时对氢柴油双直喷发动机的影响，为氢柴油双直喷发动机的发展提供了理论依据和数据支撑。

Abstract

To delve into how hydrogen injection parameters are related to the performance of hydrogen-diesel dual direct injection engines

numerical simulation methods were employed in this study to investigate the combustion mode of heavy-duty diesel engines under high-load conditions with hydrogen-diesel dual direct injection.To explore the influence of hydrogen injection ratio and injection timing on in-cylinder combustion and emission characteristics

a hydrogen injection pipe model was first constructed for hydrogen-diesel dual direct injection combustion in an original diesel engine；then

how different hydrogen injection ratios affected the combustion and emission characteristics was studied to identify the optimal hydrogen injection ratio；with the optimal hydrogen injection ratio identified

further analysis was performed with respect to the effect of hydrogen injection timing on the combustion process and pollutant formation.The research results show that the introduction of hydrogen can significantly change the distribution of the combustion center

moving the rich mixture zone from the combustion chamber recess to the cylinder head area.A moderate increase in the hydrogen injection ratio can notably advance the combustion center C

A50

reduce exhaust loss and piston heat transfer loss

and improve the indicated thermal efficiency.Delay in the hydrogen injection timing can increase the peak cylinder pressure

advance the combustion center

prevent hydrogen from entering the side clearance

reduce exhaust loss

and improve the indicated thermal efficiency

but the high-temperature conditions may intensify NO

formation.The optimized hydrogen injection proposal

with a hydrogen injection ratio of 20% and hydrogen injection timing at 20°crank angle before the top dead center

achieved a 1.37% improvement of thermal efficiency and 41.33% reduction of soot

but also resulted in a 12.86% increase in NO

emissions.This study has clarified the effects of the hydrogen injection ratio and timing on hydrogen-diesel dual direct injection engines.It is intended to provide theoretical basis and data support for the development of hydrogen-diesel dual direct injection engines.

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