Experimental Study of the Effect of Injection Mode on Knock Characteristics of High Compression Ratio Methanol Engines

YU Lixin; YIN Xiaojun; WANG Xibin; DUAN Hao; HU Erjiang; ZENG Ke

doi:10.7652/xjtuxb202507011

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Experimental Study of the Effect of Injection Mode on Knock Characteristics of High Compression Ratio Methanol Engines

更新时间：2025-07-09

- Experimental Study of the Effect of Injection Mode on Knock Characteristics of High Compression Ratio Methanol Engines
- Journal of Xi’an Jiaotong University Vol. 59, Issue 7, Pages: 108-117(2025)
- 作者机构：
  
  西安交通大学能源与动力工程学院， 710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202507011
  CLC： TK431
- Received：13 November 2024，
  
  Online First：26 March 2025，
  
  Published：10 July 2025
- 稿件说明：
移动端阅览
YU Lixin, YIN Xiaojun, WANG Xibin, et al. Experimental Study of the Effect of Injection Mode on Knock Characteristics of High Compression Ratio Methanol Engines[J]. Journal of Xi’an Jiaotong University, 2025, 59(7): 108-117.
DOI：

YU Lixin, YIN Xiaojun, WANG Xibin, et al. Experimental Study of the Effect of Injection Mode on Knock Characteristics of High Compression Ratio Methanol Engines[J]. Journal of Xi’an Jiaotong University, 2025, 59(7): 108-117. DOI： 10.7652/xjtuxb202507011.

摘要

为深入探究高压缩比甲醇发动机的爆震抑制方法，在一台压缩比为15∶1的单缸自然吸气点燃式甲醇发动机上，开展了化学计量比混合气条件下喷射模式对爆震特性影响的试验研究。首先，在进气道喷射模式下，研究了负荷、点火时刻和过量空气系数对爆震特性的影响；其次，在缸内直喷模式下，研究了喷射时刻对爆震特性的影响；最后，在节气门全开状态下，研究了多次喷射策略对爆震的抑制效果。结果表明：采用进气道喷射模式时，甲醇发动机在中高负荷下均发生了爆震燃烧，在指示平均有效压力（

）为0.7 MPa时，出现低频率、高强度的强烈爆震现象，最大爆震强度达8.42 MPa；采用缸内直喷模式时，发动机爆震现象被显著抑制，当

为0.91 MPa时，最大爆震强度下降到0.43 MPa；合理的两次喷射策略相比单次喷射策略可进一步降低爆震强度，同时保持较高的

。研究验证了缸内直喷结合两次喷射策略在抑制高压缩比甲醇发动机爆震现象方面的有效性，为甲醇发动机的发展和应用提供了理论依据和数据支撑。

Abstract

To investigate the knock suppression methods for high compression ratio methanol engines

an experimental study is conducted on a single-cylinder naturally aspirated spark-ignition methanol engine with a compression ratio of 15∶1

focusing on the impact of injection modes on knock characteristics under stoichiometric mixed gas conditions. First

the influence of load

ignition timing

and air-fuel ratio on knock characteristics is explored under the intake port injection mode. Second

the effect of injection timing on knock characteristics is examined under the direct injection mode. Finally

the suppression effect of multiple injection strategies on knock is analyzed unde

r wide-open throttle conditions. The results indicate that in the intake port injection mode

the methanol engine experiences knock combustion at medium to high loads

with a strong knock phenomenon characterized by low frequency and high intensity

reaching a maximum knock intensity of 8.42 MPa at an indicated mean effective pressure (

) of 0.7 MPa. In contrast

under the direct injection mode

the knock phenomenon is significantly suppressed

with the maximum knock intensity dropping to 0.43 MPa when

is 0.91 MPa. A reasonable two-injection strategy further reduces knock intensity compared to a single injection strategy while maintaining a high

. This study confirms the effectiveness of combining direct injection with a two-injection strategy in suppressing knock phenomena in high compression ratio methanol engines

providing theoretical basis and data support for the development and application of methanol engines.

关键词

Keywords

references

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