Understanding Knock Metric for Controlled Auto-Ignition Engines

Maria, Amir; Cheng, Wai K.; Kar, Kenneth; Cannella, William

doi:10.4271/2013-01-1658

Cited by 12 publications

(7 citation statements)

References 4 publications

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“…The set up details have been described previously [11]. The compression ratio is lowered to 15 by putting in a spacer between the head and the block.…”

Section: Enginementioning

confidence: 99%

The Nature of Heat Release in Gasoline PPCI Engines

Sang¹,

Cheng²,

Maria³

2014

SAE Technical Paper Series

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The heat release characteristics in terms of the maximum pressure rise rate (MPRR) and combustion phasing in a partially premixed compression ignition (PPCI) engine are studied using a calibration gasoline. Early port fuel injection provides a nearly homogeneous charge, into which a secondary fuel pulse is added via direct injection (DI) to provide stratification which is affected by the timing of the start of injection (SOI). As the SOI the DI fuel is retarded from early compression, MPRR first decreases, then increases substantially, and decreases again. The MPRR correlates mostly with the combustion phasing. The SOI timing plays an indirect role. The observation is explained by a bulk heat release process of which the rate increases with temperature rather than by a sequential ignition process. Observations from compression ignition of representative homogeneous charges in a Rapid Compression Machine support this explanation.

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“…The set up details have been described previously [11]. The compression ratio is lowered to 15 by putting in a spacer between the head and the block.…”

Section: Enginementioning

confidence: 99%

The Nature of Heat Release in Gasoline PPCI Engines

Sang¹,

Cheng²,

Maria³

2014

SAE Technical Paper Series

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“…It may be noted that heat is released in a dual-fuel engine on the order of 0.1 ms [31]. This rapid heat release rate leads to intensified pressure wave formation in the cylinder and the local pressure of ignition pockets could be very high as compared to the global pressure of the combustion chamber.…”

Section: Analysis Of Knocking Phenomenonmentioning

confidence: 96%

“…Please cite this article in press as: Chintala V, Subramanian KA, Experimental investigations on effect of different compression ratios on enhancement of maximum hydrogen energy share in a compression ignition engine under dual-fuel mode, Energy (2015), http://dx.doi.org/ 10.1016/j.energy.2015.05.014be determined using fundamental equations as given in Eqs. 16e20[31].…”

mentioning

confidence: 99%

Experimental investigations on effect of different compression ratios on enhancement of maximum hydrogen energy share in a compression ignition engine under dual-fuel mode

Chintala

Subramanian

2015

Energy

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“…Ringing Intensity (RI) is an acoustic parameter, which gives us the measure of knock. Basically, RI (flux of acoustic-energy) is formed with pressure-oscillations (Maria et al, 2013;Dernotte et al, 2015). RI is calculated with the help Eq.…”

Section: Ringing Intensitymentioning

confidence: 99%

Effect of methane supplementation on the performance, vibration and emissions characteristics of methane-diesel dual fuel engine

Tripathi

Nag²,

Sharma³

et al. 2023

Front. Therm. Eng.

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The increasing energy demands, especially in transportation sector, and the challenges of excess pollution and environmental degradation caused due to the conventional fuels, as well as their limited availability has highlighted the need to look for alternative fuels to sustain future needs. Methane is capable of catering to these demands due to its wide availability, both in renewable and non-renewable energy sources. The present work explores the effect of methane supplementation on the performance and emission characteristics as well as the vibrations in internal combustion engines. A four-stroke compression ignition engine is modified to run as a methane-diesel dual fuel engine where methane is inducted through intake manifold and diesel is directly injected into cylinder. Tests are performed by varying engine load and methane energy levels up to 75%. Our study shows that the participation of methane at lower load conditions is weak due to its higher auto ignition temperature and higher calorific value. The emissions, particularly CO and NO, are observably higher at 75% load conditions due to the efficient combustion and higher temperature at higher load conditions. The vibration studies on the dual fuel combustion indicates that the introduction of methane also suppresses the frequency spectrum of combustion noise and reduces the ringing intensity level of vibration for complete spectrum of engine loads, with the effect being prominent at higher loads. Overall, our results suggests that combustion of methane in dual fuel diesel engine shows distinct characteristics at contrasting load conditions.

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Understanding Knock Metric for Controlled Auto-Ignition Engines

Cited by 12 publications

References 4 publications

The Nature of Heat Release in Gasoline PPCI Engines

The Nature of Heat Release in Gasoline PPCI Engines

Experimental investigations on effect of different compression ratios on enhancement of maximum hydrogen energy share in a compression ignition engine under dual-fuel mode

Effect of methane supplementation on the performance, vibration and emissions characteristics of methane-diesel dual fuel engine

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