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Effect of Hydrogen Jet Ignition on Combustion Characteristics of Coalbed Methane Engine
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[1]HE Yituan,WANG Qian,QIN Zihan,et al.Effect of Hydrogen Jet Ignition on Combustion Characteristics of Coalbed Methane Engine[J].Journal of Zhengzhou University (Engineering Science),2025,46(02):97-103.[doi:10.13705/j.issn.1671-6833.2025.02.002]
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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 46 Number of periods: 2025 02 Page number: 97-103 Column: Public date: 2025-03-10
Title:
Effect of Hydrogen Jet Ignition on Combustion Characteristics of Coalbed Methane Engine
Author(s):
HE Yituan;  WANG Qian;  QIN Zihan;  FU Yanyan
College of Transportation, Chongqing Jiaotong University, Chongqing 400074, China
Keywords:
low concentration coalbed methane;  hydrogen injection combustion;  composite injection;  ignition hydrogen injection matching;  flame structure
CLC:
U464.1TK431
DOI:
10.13705/j.issn.1671-6833.2025.02.002
Abstract:
In order to avoid the phenomena of combustion instability and knock in the process of power generation of large bore low concentration coalbed methane engine, the promoting effect on combustion of hydrogen jet ignition was studied. The influence of ignition-hydrogen injection interval on jet flame structure and combustion-supporting efficiency of engine were investigated. Based on the three-dimensional fluid mechanics software, the effects of different ignition-hydrogen injection matching strategies on the combustion performance of the engine were studied by changing the ignition time with fixed hydrogen injection time and hydrogen injection pulse width. The results showed that the obvious plume jet flame could be formed in the two working conditions of ignition before hydrogen injection (ignition in 5 ℃A before hydrogen injection) and ignition during hydrogen injection, which could improve the combustion rate of the engine. The ignition delay period and combustion duration were shortened by 64% and 68% respectively compared with the original engine. The peak pressure and the peak heat release rate were increased by 2.1 MPa and 1.05 kJ/℃A. Fixing the hydrogen injection time and changing the ignition time, the indicated thermal efficiency of the two working conditions of the ignition before hydrogen injection and the ignition during hydrogen injection was not much different, both of which are about 40%. The efficiency of the two groups of cases that ignition after hydrogen injection were 38.3% and 36.7%, respectively. The indicated thermal efficiency of the engine could be increased by about 4% compared with the original engine by reasonably controlling the ignitionhydrogen injection time.
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