Effect of Air Flow Conditions in Cylinder and Double-Point Ignition on Flame Propagation Characteristics and Thermal Efficiency of CNG Engine

被引：0
作者：
Yang M. [1 ]
Lin X. [1 ]
Li D. [1 ]
Liu Y. [1 ]
机构：
[1] Jilin University, State Key Laboratory of Automotive Simulation and Control, Changchun
来源：
Qiche Gongcheng/Automotive Engineering | 2022年 / 44卷 / 01期
关键词：
Double point ignition; Driving effect; Flame propagation; Indicating thermal efficiency;
D O I：
10.19562/j.chinasae.qcgc.2022.01.007
中图分类号：
学科分类号：
摘要：
Improving the indicative thermal efficiency of CNG-DI engine is an important way to meet the requirements of low carbonization. In this paper, CFD software AVL FIRE is used to simulate and analyze the combustion process and in-cylinder flow field characteristics of CNG-DI engine modified with 2.0 L diesel engine. Firstly, the correctness of the calculation model is verified by experimental results of CNG-DI optical engine. Then, based on the simulation model, the effect of turbulence intensity of different combustion chamber structures on flame propagation process in CNG direct injection and the effect of double point ignition mode on flame propagation velocity in flat top combustion chamber are analyzed. The results show that the shape of combustion chamber has great influence on turbulence characteristics and concentration field distribution characteristics. The increase of turbulence intensity accelerates the flame propagation process, but excessive turbulence intensity will lead to the fracture of flame surface and insufficient local combustion, which will reduce the combustion efficiency and thus lead to the decline of indicating thermal efficiency. Double point ignition can not only increase the flame front area, but also form mutual driving effect between the two flame masses, with more sufficient combustion, so as to improve the indicating thermal efficiency. © 2022, Society of Automotive Engineers of China. All right reserved.
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页码：52 / 57
页数：5
相关论文
共 10 条
  • [1] BENAJES J, NOVELLA R, PASTOR J M, Et al., Computational optimization of the combustion system of a heavy duty direct injection diesel engine operating with dimethyl-ether, Fuel, 218, pp. 127-139, (2018)
  • [2] MEHRA R K, DUAN H, JUKNELEVICIUS R, Et al., Progress in hydrogen enriched compressed natural gas (HCNG) internal combustion engines - a comprehensive review, Renewable and Sustainable Energy Reviews, 80, pp. 1458-1498, (2017)
  • [3] SONG J, CHOI M H, PARK S., Comparisons of the volumetric efficiency and combustion characteristics between CNG-DI and CNG-PFI engines, Applied Thermal Engineering, 121, pp. 595-603, (2017)
  • [4] BARATTA M, RAPETTO N., Mixture formation analysis in a direct-injection NG SI engine under different injection timings, Fuel, 159, pp. 675-688, (2015)
  • [5] CHO H M, HE B Q., Spark ignition natural gas engines-a review, Energy Conversion and Management, 48, pp. 608-618, (2007)
  • [6] BARATTA M, RAPETTO N., Fluid-dynamic and numerical aspects in the simulation of direct CNG injection in spark-ignition engines, Computers & Fluids, 103, pp. 215-233, (2014)
  • [7] SRIVASTAVA D K, AGARWAL A K., Combustion characteristics of a variable compression ratio laser-plasma ignited compressed natural gas engine, Fuel, 214, pp. 322-329, (2018)
  • [8] WU C M, DENG K Y, WANG Z., The effect of combustion chamber shape on cylinder flow and lean combustion process in a large bore spark-ignition CNG engine, Journal of the Energy Institute, 89, pp. 240-247, (2016)
  • [9] KATO K, IGARASHI K, MASUDA M, Et al., Development of engine for natural gas vehicle
  • [10] MCGEE J, ALGER T, BLOBAUM E, Et al., Evaluation of a direct-injected stratified charge combustion system using tracer PLIF
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