Experimental Study on the Influence of Injection Pressure on the Combustion and Emission Characteristics of Methanol Direct Injection Engine

REN Xianfeng; WANG Jinping; NIU Kaili; YIN Xiaojun; DUAN Hao; HU Erjiang; ZENG Ke

doi:10.7652/xjtuxb202506002

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Experimental Study on the Influence of Injection Pressure on the Combustion and Emission Characteristics of Methanol Direct Injection Engine

Special Topic　Combustion Process | 更新时间：2025-08-26

- Experimental Study on the Influence of Injection Pressure on the Combustion and Emission Characteristics of Methanol Direct Injection Engine
- Journal of Xi’an Jiaotong University Vol. 59, Issue 6, Pages: 11-20(2025)
- 作者机构：
  
  1.西安交通大学能源与动力工程学院， 710049，西安
  2.中国重型汽车集团有限公司汽车研究总院， 250102，济南
  3.潍柴动力股份有限公司， 261061，山东潍坊
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202506002
  CLC： TK431
- Received：03 January 2025，
  
  Online First：26 February 2025，
  
  Published：10 June 2025
- 稿件说明：
移动端阅览
REN Xianfeng, WANG Jinping, NIU Kaili, et al. Experimental Study on the Influence of Injection Pressure on the Combustion and Emission Characteristics of Methanol Direct Injection Engine[J]. Journal of Xi’an Jiaotong University, 2025, 59(6): 11-20.
DOI：

REN Xianfeng, WANG Jinping, NIU Kaili, et al. Experimental Study on the Influence of Injection Pressure on the Combustion and Emission Characteristics of Methanol Direct Injection Engine[J]. Journal of Xi’an Jiaotong University, 2025, 59(6): 11-20. DOI： 10.7652/xjtuxb202506002.

摘要

为准确揭示喷射参数对发动机性能的影响规律，基于单缸柴油机构建了甲醇缸内直喷发动机实验平台，利用台架实验系统研究了中等转速和中等负荷工况下，喷射压力对直喷甲醇发动机动力性、经济性、燃烧和排放特性的影响规律。结果表明：提升喷射压力对放热速率改善作用有限，对燃烧始点、燃烧重心、燃烧终点、火焰发展期和燃烧周期影响较小，但能显著降低缸内循环变动。喷射压力的提升可改善混合气均匀性与充气效率，增大发动机指示平均有效压力（IMEP）和缸内压力峰值（

max

）。当进气压力为0.065 MPa时，相比甲醇喷射压力为6 MPa和22 MPa时IMEP的循环变动和

max

的循环变动分别降低了42.7%和37.3%，IMEP增加了6.8%。此外，喷射压力对排放物影响复杂：随着喷射压力的提升，CO排放量近似线性下降，NO

排放量大幅增加，碳氢化合物和甲醇排放量因进气压力而异，甲醛排放量则略有上升。研究明确了喷射压力对甲醇缸内直喷发动机的影响，可为实际发动机控制策略的开发和优化提供理论基础和数据指导。

Abstract

To accurately reveal the influence mechanism of injection parameters on engine performance

this paper built an experimental platform for a direct-injection methanol engine based on a single-cylinder diesel engine. A bench test system was used to investigate the influence of injection pressure on the power

economy

combustion

and emission characteristics of the direct-injection methanol engine under medium-speed and medium-load conditions. The results suggest that the method of augmenting the injection pressure plays a limited role in enhancing the heat release rate

exerting only a minor influence on the combustion start point

combustion center of gravity

combustion end point

flame development period

and combustion cycle. Nevertheless

it can remarkably reduce the in-cylinder variation coefficients. Simultaneously

an increase in injection pressure can improve the uniformity and charging efficiency of the mixture

thereby raising the indicated mean effective pressure (IMEP) and the peak in-cylinder pressure (

max

) of the engine. For instance

at an intake pressure of 0.065 MPa

when the methanol injection pressure is increased from 6 MPa to 22 MPa

the coefficient of variation of IMEP and coefficient of variation of

max

dec

rease by 42.7% and 37.3%

respectively

while the IMEP increases by 6.8%. Furthermore

the influence of injection pressure on emissions is intricate. As the injection pressure rises

CO emissions decline in an approximately linear manner

emissions increase substantially

the trends of hydrocarbon and methanol emissions vary depending on the intake pressure

and formaldehyde emissions exhibit a slight increment. This study can offer a theoretical foundation and data-based guidance for the development and optimization of practical engine control strategies.

关键词

Keywords

references

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