Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (6): 1929-1935.doi: 10.13229/j.cnki.jdxbgxb20190548

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Effects of single and dual ignition on combustion characteristics of natural gas under different equivalence ratios

Chang-qing SONG1(),Wen-miao CHEN2,Jun LI1,Da-wei QU1(),Hao CUI1   

  1. 1. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China
    2. New Science and Technology Research Institute, Weichai Power Co. , Ltd. , Weifang 261000, China
  • Received:2019-05-29 Online:2019-11-01 Published:2019-11-08
  • Contact: Da-wei QU E-mail:sochaqing@163.com;eewang404@163.com

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Abstract:

Aiming at the problems of slow combustion speed, high exhaust temperature, high heat load and prone to knock for natural gas engine with large cylinder bore, a visual constant volume combustion system suitable for dual-spark plug ignition is designed in this paper. Combining the rapid combustion technology and the natural flame luminescence method, the visualization experiment of natural gas combustion was carried out on a constant volume combustion bomb by changing the fuel-air equivalence ratio. The images of dynamic combustion process in cylinder were collected by high-speed camera，the effects of single and dual-spark plug ignition on flame propagation, combustion pressure in cylinder and combustion duration were studied by using the digital image processing technology of MATLAB. The results show that under different equivalence ratios, compared with single ignition, the dual ignition can shorten the flame propagation distance, accelerate the combustion speed in cylinder, shorten the flame development period and the main combustion period, and thus improve the thermal efficiency of combustion. Especially for the lean combustion of natural gas, the effect is very obvious, which can restrain the occurrence of misfire and knock, broaden the lean combustion limit, and is conducive to combustion stability and emission reduction.

Key words: power machinery and engineering, dual-spark plug, natural gas, fixed volume combustion bomb, combustion characteristic

CLC Number: 

  • TK46

Fig.1

Structure diagram of constant volume bomb"

Fig.2

Test system chart and test stages"

Fig.3

Debugging of ignition waveform"

Table 1

Natural gas fuel components"

成分 Vol/% 成分 Vol/%
CH4 91.87 C5H12 0.30
C2H6 2.53 C6H14 0.18
C3H8 1.24 N2 2.98
C4H10 0.77 O2 0.13

Fig.4

Image of noise frequency domain"

Fig.5

Processing of noise reduction and filtering"

Fig.6

Images of flame propagation when equiv alent ratio is 0.8"

Fig.7

Cylinder pressure comparison of single and doublespark plugs when equivalent ratio is 0.8"

Table 2

Peak pressure and related moment when equivalent ratio is 0.8"

点火方式 峰值压力/MPa 对应时刻/ms 火焰发展期/ms 主燃期/ms
单点火 3.27 126.8 38 74
双点火 3.48 101.2 35 50

Fig.8

Images of flame propagation when equiv alent ratio is 1.0"

Fig.9

Cylinder pressure comparison of single and doublespark plugs when the equivalent ratio is 1.0"

Table 3

Peak pressure and related moment when equivalent ratio is 1.0"

点火方式 峰值压力/MPa 对应时刻/ms 火焰发展期/ms 主燃期/ms
单点火 3.57 81.1 32.0 36
双点火 3.76 77.2 32.6 30

Fig.10

Images of flame propagation when equivalent ratio is 1.2"

Fig.11

Cylinder pressure comparison of single and double spark plugs when equivalent ratio is 1.2"

Table 4

Peak pressure and related moment when equivalent ratio is 1.2"

点火方式 峰值压力/MPa 对应时刻/ms 火焰发展期/ms 主燃期/ms
单点火 3.05 111.2 45.0 54.6
双点火 3.25 105.6 38.8 44.2
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