Impact of Ignition Energy Phasing and Spark Gap on Combustion in a Homogenous Direct Injection Gasoline SI Engine Near the EGR Limit

Wei, Chen; Madison, Daniel P.; Dice, Paul; Naber, Jeffrey; Chen, Bin; Miers, Scott A.; Czekala, Michael; Glugla, Chris; Qu, Qiuping; Huberts, Garlan

doi:10.4271/2013-01-1630

Cited by 33 publications

(10 citation statements)

References 21 publications

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“…Possible solutions could be lean or diluted mixtures [1,53] as well as pre-chamber spark plugs [63,64], which increase the efficiency of internal combustion engines. The three options mentioned are increasing the stress on the spark plug in terms of inflammation probability and wear [9,11,69].…”

Section: Introductionmentioning

confidence: 99%

Measurement of temporal and spatial resolved rotational temperature in ignition sparks at atmospheric pressure

Michler

Toedter

Koch

2020

Automot. Engine Technol.

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In this work, the temporal and spatial rotational temperature, as an indicator of spark temperature in the gas, of an ignition spark at ambient pressure is determined. With optical emission spectroscopy, the rotational bands of the nitrogen C 3 Π u → B 3 Π g transition at a wavelength of 337 nm are for determination. In addition, the electrical values of the current and the voltage are measured with a digital storage oscilloscope. All measurements are performed with a common nickel spark plug and a commercial 90 mJ ignition coil. The dwell time of the coil is varied in four steps from 100 to 25% and the influence on the rotational temperature is measured. The results are split into the three spark phases: breakdown, arc discharge, and glow discharge. The results show a cold breakdown, which is independent from the dwell time. On average, arc discharge is the hottest discharge phase, while the glow discharge has a medium rotational temperature.

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Section: Introductionmentioning

confidence: 99%

Measurement of temporal and spatial resolved rotational temperature in ignition sparks at atmospheric pressure

Michler

Toedter

Koch

2020

Automot. Engine Technol.

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“…CCV inevitably appears over the whole engine operation range, due in particular to the unsteady, cyclic and turbulent nature of flow and combustion in SIE. It is common practice to consider that a CCV amplitude (measured in terms of standard deviation of Indicated Mean Effective Pressure (IMEP), normalised by its mean value) of less than around 5 % is acceptable [3]. As long as the CCV amplitude is sufficiently small, engine simulation softwares can predict with sufficient accuracy combustion using statistical approaches as RANS (Reynolds-Averaged Navier-Stokes) that neglect cyclic variations and aim at reproducing a phase averaged, statistically most probable, cycle.…”

Section: Introductionmentioning

confidence: 99%

“…He concluded that the flame area was highly correlated to the crank angle at which 5 % fuel mass fraction was burnt, while the flame volume was highly correlated to spark energy. In a recent paper [3] the impact of the ignition system on the combustion in a direct-injection engine was studied, showing that larger spark gaps, longer spark life durations and multi-spark ignitions were beneficial to the extension of the dilution limit and to the combustion stability. Such experiments only come into play once a prototype has actually been built, in design phases where modifications to the basic concept are difficult to achieve because of cost and time constraints.…”

Section: Introductionmentioning

confidence: 99%

Using large-eddy simulation and multivariate analysis to understand the sources of combustion cyclic variability in a spark-ignition engine

Truffin

Angelberger

Richard

et al. 2015

Combustion and Flame

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Using large-eddy simulation and multivariate analysis to understand the sources of combustion cyclic variability in a spark-ignition engine. Combustion and Flame, Elsevier, 2015, 162, pp.Abstract The origins of cyclic combustion variability (CCV) in spark-ignition engines are investigated using Large-Eddy Simulation (LES) of a stable (low CCV) and two unstable (high CCV) operating points of a specifically dedicated experimental test-rig set up around a four valve pentroof single cylindre spark-ignition engine fueled with a premixture of gaseous propane and air. The unstable points are obtained from the reference by reducing significantly the equivalence ratio and by an important dilution by nitrogen respectively. A LES methodology is proposed and shown to be able to reproduce the experimental findings concerning phase-averaged mean and statistical variations around it of a number of key engine combustion parameters. The CCV and factors causing it are first illustrated by comparing typical slow and fast burning cycles in combination with simple correlation plots of major engine parameters, this allows qualitatively showing how local and global sources concur to generate CCV. In a second step, single parameter and multivariate regressions build from the LES results allow quantifying the relative importance of different local and global CCV sources. Finally, the comparison of the obtained findings as to the relative importance of major parameters on CCV are compared with qualitative summary from an extensive experimental survey by Ozdor et al. The presented LES results overall confirm major findings from the survey, but also indicate that detailed causes of CCV depend on the type of engine and its operation.

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“…A schematic diagram of the DCO ignition system is given in Figure 5. 61 The working principles can be explained from the waveforms of the charging and discharge current shown in Figure 6. The main advantageous feature of the DCO is the ability to produce a continuous spark discharge with prolonged duration, using conventional ignition coil designs.…”

Section: High-energy Spark Ignitionmentioning

confidence: 99%

Future gasoline engine ignition: A review on advanced concepts

Zheng

2020

International Journal of Engine Research

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To meet the future requirements of fuel economy and exhaust emissions, high-efficiency gasoline engines tend to employ diluted combustion concepts along with intensified charge motion and stratified mixtures. Securing the ignition of such mixtures over the full engine operation range is challenging, because of the lowered mixture reactivity and increased discrepancy of stoichiometry. In recent years, increasing research efforts have been spending on innovations of ignition technologies to tackle the challenges. In this paper, the directions of ignition improvement are highlighted based on the fundamental understanding of the ignition mechanisms. The working principles of the primary types of advanced ignition systems are introduced; and relevant engine and combustion vessel test results are reviewed. The ignition systems are categorized as: (1) high-energy spark ignition, (2) pulsed nanosecond discharge ignition, (3) radio-frequency plasma ignition, (4) laser-induced plasma ignition, and (5) pre-chamber ignition. The advanced ignition systems are commented, regarding the ignition effectiveness and the implementation challenges, according to the literatures and the extensive empirical work at the authors’ laboratory.

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Impact of Ignition Energy Phasing and Spark Gap on Combustion in a Homogenous Direct Injection Gasoline SI Engine Near the EGR Limit

Cited by 33 publications

References 21 publications

Measurement of temporal and spatial resolved rotational temperature in ignition sparks at atmospheric pressure

Measurement of temporal and spatial resolved rotational temperature in ignition sparks at atmospheric pressure

Using large-eddy simulation and multivariate analysis to understand the sources of combustion cyclic variability in a spark-ignition engine

Future gasoline engine ignition: A review on advanced concepts

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