Thermodynamic and experimental determinations of knock intensity by using a spark-ignited rapid compression machine

Kono, Michikata; Shiga, Seiichi; Kumagai, S.; Iinuma, Kazuo

doi:10.1016/0010-2180(83)90020-2

Cited by 38 publications

(12 citation statements)

References 2 publications

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“…In the non-diluted case, the dependency of the knocking intensity on the volume fraction was confirmed and the knocking intensity reached a peak at about 0.6 in the volume fraction. This result agrees with the theory and the experiments of the past studies [4][5][6]. However, the variation in the knocking intensity exists for a given volume fraction for flame propagation.…”

Section: Dominant Factor Of Knocking Intensity Under In-cylinder Flowsupporting

confidence: 92%

“…Unlike the past study [5], the flame propagation velocity was varied by turbulence and dilution to vary the volume fraction for flame propagation, in this study. The dependence of the knocking intensity on the volume fraction for flame propagation is shown in Fig.…”

Section: Dominant Factor Of Knocking Intensity Under In-cylinder Flowmentioning

confidence: 99%

“…The compression due to flame propagation causes the spontaneous ignition. Numerous studies have been carried out for many decades to explain the mechanism of the knocking occurrence, to identify the factors, and to develop the countermeasures against SI knock [2][3][4][5][6][7][8][9][10][11][12][13][14]. Among them, a lot of studies have been carried out by using Rapid Compression (and Expansion) Machines (RCM, RCEM) and SI engines.…”

Section: Introductionmentioning

confidence: 99%

“…On the knocking characteristics such as intensity, a few remarkable studies have been carried out [4][5][6][7][8][9][10][11]. Kono et al [5] and Kumagai et al [6] clarified the dependency of the knocking intensity on the volume fraction for flame propagation and they reported that the knocking intensity reaches their maximum at the volume fraction of about 0.6.…”

Section: Introductionmentioning

confidence: 99%

“…Kono et al [5] and Kumagai et al [6] clarified the dependency of the knocking intensity on the volume fraction for flame propagation and they reported that the knocking intensity reaches their maximum at the volume fraction of about 0.6. The volume fraction for flame propagation means the proportion of the flame volume to the total volume of the combustion chamber.…”

Section: Introductionmentioning

confidence: 99%

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Study on Knocking Intensity under In-Cylinder Flow Field in SI Engines Using a Rapid Compression Machine

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Kohata

Tsumori

et al. 2013

JTST

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Knocking intensity under the in-cylinder flow field was investigated by using a rapid compression machine (RCM). The nitrogen diluted and non-diluted fuel-air mixtures were employed for the examination of the combustion characteristics under the in-cylinder flow field. The behaviors of flame propagation and the spontaneous ignition in end gas were observed. The analyses of the in-cylinder flow field and the dependency of the knocking intensity with considering the volume fraction for flame propagation and the heat release rate of the spontaneous ignition in end gas were carried out. As a result, the flame propagation velocity increased with heightening the turbulent intensity. The change of the flame propagation velocity provided the change of the volume fraction for flame propagation. The knocking intensity depended on the volume fraction for flame propagation and it reached a peak at about 0.6 in the volume fraction, when the heat release rate due to the spontaneous ignition was high enough. This agreed with the numerical prediction qualitatively. The combustion due to the spontaneous ignition in end gas was prolonged by the broader temperature variation by turbulence when the spontaneous ignition in end gas was delayed or turbulence was strong. In these cases, the knocking intensity was lowered with the prolongation of the combustion in end gas. It was to be expected that the dependency on the volume fraction for flame propagation remained the same even when the heat release rate due to the spontaneous ignition was lowered, by the numerical simulation.

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Section: Dominant Factor Of Knocking Intensity Under In-cylinder Flowsupporting

confidence: 92%

Section: Dominant Factor Of Knocking Intensity Under In-cylinder Flowmentioning

confidence: 99%