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Research Papers: Internal Combustion Engines

Spark-Ignition and Combustion Characteristics of High-Pressure Hydrogen and Natural-Gas Intermittent Jets

[+] Author and Article Information
Ali Mohammadi

 Toyota Motor Europe, Hoge Wei 33B-1930 Zaventem, Belgiumali.mohammadi@toyota-europe.com

Masahiro Shioji

Graduate School of Energy Science,  Kyoto University, Sakyo-ku, Kyoto 606-8501, Japanshioji@energy.kyoto-u.ac.jp

Yuki Matsui, Rintaro Kajiwara

Graduate School of Energy Science,  Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan

J. Eng. Gas Turbines Power 130(6), 062801 (Aug 21, 2008) (7 pages) doi:10.1115/1.2938271 History: Received January 25, 2006; Revised March 06, 2008; Published August 21, 2008

Recently, an in-cylinder injection method has been considered for the improvement of thermal efficiency in natural-gas and hydrogen spark-ignition (SI) engines. However, the SI and combustion processes of gaseous jets are not well understood. The present study aims to provide fundamental data for the development of direct-injection SI gas engines. The ignition, combustion, and flame behavior of high-pressure and intermittent hydrogen and natural-gas jets in a constant volume combustion chamber were investigated. The effects of injection pressure, nozzle size, ambient pressure, and spark location were also investigated for various spark timings and equivalence ratios.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Constant volume combustion vessel

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Figure 2

Ignition locations

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Figure 3

Penetration lengths of natural-gas and hydrogen jets for different ambient pressures pa, and injection pressures pj

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Figure 4

History of pressure p, and heat release rate dq∕dt, for natural-gas combustion at an equivalence ratio of ϕ=1.0

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Figure 5

Shadowgraph images of natural-gas combustion with an equivalence ratio of 1.0

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Figure 6

Combustion characteristics of natural-gas jets for various equivalence ratios

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Figure 7

Combustion characteristics of hydrogen jets for various injection timings with ϕ=0.4: (a) ti<Δtj; (b) ti>Δtj

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Figure 8

Shadowgraph images for hydrogen jet combustion with an equivalence ratio of ϕ=0.4

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Figure 9

Combustion characteristics of hydrogen jets, for various equivalence ratios

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Figure 10

Effect of ambient pressure pa, on the combustion of hydrogen jets

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Figure 11

Effect of injection pressure pj, on the combustion of hydrogen jets

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Figure 12

Effect of spark location on the combustion of hydrogen jets, for an equivalence ratio of 0.4

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Figure 13

Effect of nozzle hole diameter dN, on the combustion of hydrogen jets

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