A Basic Behavior of CNG DI Combustion in a Spark-Ignited Rapid Compression Machine.

Huang, Zuohua; Shiga, Seiichi; Ueda, Takamasa; Jingu, Nobuhisa; Nakamura, Hisao; Ishima, Tsuneaki; Obokata, Tomio; Tsue, Mitsuhiro; Kono, Michikata

doi:10.1299/jsmeb.45.891

Cited by 25 publications

(30 citation statements)

References 7 publications

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“…It was shown that CO maintained almost the same level for two equivalence ratios while unburned CH 4 and NO x have di erent values between the two equivalence ratios. This is the typical characteristic of strati ed mixture combustion in the previous study [7]. Relatively large variations were found in CO (10-20 per cent in CoD), unburned CH 4 (10 per cent in CoD) and NO x (12-15 per cent in CoD) since their average values are relatively low.…”

Section: ¢P Maxsupporting

confidence: 61%

“…In previous studies even lower emissions could be realized by using natural gas [6 ]. However, the large cycle-by-cycle variations (the combustion instability) under lean combustion condition also limit its operating range (w "0.6) in the homogeneous charge spark-ignited engines and in studies using a rapid compression machine ( RCM ) [1,3,7].…”

Section: Introductionmentioning

confidence: 99%

“…The preliminary studies have revealed the favourable characteristics of fast burning, an extremely lean combustion limit, low emission and high combustion e ciency [7][8][9]. Since those studies were just at the stage of feasibility, there remain many aspects worth examining.…”

Section: Introductionmentioning

confidence: 99%

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Study of cycle-by-cycle variations of natural gas direct injection combustion using a rapid compression machine

Huang

Shiga

Ueda

et al. 2003

Proceedings of the Institution of Mechanical Engineers, Part D:

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Cycle-by-cycle variations of natural gas direct injection (CNG DI ) combustion were studied by using a rapid compression machine. Results show that CNG DI combustion can realize high combustion stability with less cycle-by-cycle variation in the maximum pressure rise, the maximum rate of pressure rise and the maximum rate of heat release at the given equivalence ratios. Mixture strati cation and fast ame propagation with the aid of turbulence produced by the high speed fuel jet are considered to be responsible for these behaviours. Cycle-by-cycle variations in combustion durations and combustion products present higher magnitudes than those of maximum pressure rise and maximum rate of heat release. Cycle-by-cycle variations of CO and unburned CH 4 show an interdependence with the variation of the late combustion duration, and the variation of NO x shows an interdependence with the variation of the rapid combustion duration. Cycle-by-cycle variations are found to be insensitive to the equivalence ratios in CNG DI combustion.

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Section: ¢P Maxsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

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Study of cycle-by-cycle variations of natural gas direct injection combustion using a rapid compression machine

Huang

Shiga

Ueda

et al. 2003

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The initial cylinder air pressure and temperature before compression were set at the atmospheric condition for the case of injection and a slightly increased value according to w for homogeneous mixtures to maintain the same total mass as that in the case of fuel injection before ignition starts [13]. Figure 2 shows the representative cylinder pressure Combustion products were analysed by using a highsensitivity Fourier transform infrared analyser ( Horiba MEXA4000FT).…”

Section: Methodsmentioning

confidence: 99%

Combustion characteristics of natural-gas direct-injection combustion under various fuel injection timings

Huang

Shiga

Ueda

et al. 2003

Proceedings of the Institution of Mechanical Engineers, Part D:

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The characteristics of natural-gas direct-injection combustion under various fuel injection timings were studied by using a rapid compression machine. Results show that natural-gas direct injection can result in combustion that is much faster than homogeneous combustion while shortening the time interval between injection timing and ignition timing can markedly decrease the combustion duration. Unburned hydrocarbon would increase over a wide range of equivalence ratios, shortening the time interval between injection timing and ignition timing can decrease the value to that of homogeneous-mixture combustion. The NO x level is high but the CO level is low over a wide range of equivalence ratios and is little a ected by fuel injection timing. High values of pressure rise due to combustion can be realized and it is insensitive to the variation in fuel injection timing. High combustion e ciency can be achieved, which is also independent of injection timing.

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“…Lean mixtures of alternative fuels such as natural gas, biofuels and fuel-blends, with operational modes such as direct injection (DI) and homogeneous charge compression ignition (HCCI) have been realized in recent years, with improved performance over the conventional gasoline and diesel engines [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. However, internal combustion engines suffer from cycle-to-cycle variations (CCV) in combustion variables such as pressure, and these cyclic variations may become severe under lean burn conditions or for highly dilute mixtures with exhaust gas recirculation (EGR) [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of cycle-to-cycle variations in a natural gas direct-injection spark-ignition engine

Sen¹,

Zheng²,

Huang³

2011

Applied Energy

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A Basic Behavior of CNG DI Combustion in a Spark-Ignited Rapid Compression Machine.

Cited by 25 publications

References 7 publications

Study of cycle-by-cycle variations of natural gas direct injection combustion using a rapid compression machine

Study of cycle-by-cycle variations of natural gas direct injection combustion using a rapid compression machine

Combustion characteristics of natural-gas direct-injection combustion under various fuel injection timings

Dynamics of cycle-to-cycle variations in a natural gas direct-injection spark-ignition engine

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