Fundamental Analysis of Combustion Initiation Characteristics of Low Temperature Plasma Ignition for Internal Combustion Gasoline Engine

Shiraishi, Taisuke; Urushihara, Tomonori

doi:10.4271/2011-01-0660

Cited by 37 publications

(19 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The O density is however reduced by the strong interaction with the water dissociation products OH and HO 2 , capable to capture the O [30], of a particular interest in the water injection case. Fundamentally, the oxygen in atomic, ionic or excited state seems to be the key chemical species for the plasma ignition [31,32,33], in particular in the atomic state, to increase the flame's propagation velocity [27,34].…”

Section: Introductionmentioning

confidence: 99%

Experimental characterisation of the thermal energy released by a Radio-Frequency Corona Igniter in nitrogen and air

et al. 2020

View full text Add to dashboard Cite

The Radio-Frequency Corona Ignition System is characterised by a wide initial combustion volume and precursors production, via radical insemination by the streamers, in addition to high released thermal energy. These features lead to faster combustion, a higher tolerance for lean mixtures and EGR dilutions and, in general, more adaptability. The thermal energy released by the igniter to the surrounding medium can help to understand the performance, the behaviour and the application range. This paper proposes a systematic experimental analysis of the thermal energy released by the igniter at room temperature, via pressure-based calorimetry. This analysis, carried out at different pressures (up to 10 bar) and medium type (air or nitrogen), is extended to the whole range of the corona igniter control parameters, namely streamer duration and driving voltage. The latter is proportional to the maximum electrode voltage, as shown in the model here presented, and as confirmed by experiments. The results show, for all the vessel pressures, the high energetic efficiency of the ignition system and the high amount of the released energy. The latter is found to increase linearly with the corona streamers duration and quickly with the driving voltage up to the streamer-to-arc transition threshold. The efficiency tends to reach a defined upper limit. For each tested point, the energy released to pure nitrogen is higher than to air, which evidences the impact of the oxygen presence under streamer exposure.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental characterisation of the thermal energy released by a Radio-Frequency Corona Igniter in nitrogen and air

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Furthermore, it is only after a much longer pause that the steep increase of OH* signal, with an even steeper gradient than with the CIS, occurs. The time difference in occurrence of increasing OH* signal might be due to different rates and mechanisms of flame kernel development which has been published in several works already [28,46,47,48].…”

Section: Corona Ignition System With Ron-95 Gasolinementioning

confidence: 99%

Investigations on Spark and Corona Ignition of Oxymethylene Ether-1 and Dimethyl Carbonate Blends with Gasoline by High-Speed Evaluation of OH* Chemiluminescence

Langhorst

Toedter

Koch

et al. 2018

SAE Int. J. Fuels Lubr.

View full text Add to dashboard Cite

Bio-fuels of the 2nd generation constitute a key approach to tackle both Greenhouse Gas (GHG) and air quality challenges associated with combustion emissions of the transport sector. Since these fuels are obtained of residual materials of the agricultural industry, well-to-tank CO 2 emissions can be significantly lowered by a closed-cycle of formation and absorption of CO 2. Furthermore, studies of bio-fuels have shown reduced formation of particulate matter on account of the fuels' high oxygen content therefore addressing air quality issues. However, due to the high oxygen content and other physical parameters these fuels are expected to exhibit different ignition behaviour. Moreover, the question is whether there is a positive superimposition of the fuels ignition behaviour with the benefits of an alternative ignition system, such as a corona ignition. To shed light on these questions two oxygenic compounds, oxymethylene ether-1 (OME1) and dimethyl carbonate (DMC) have been studied with respect to OH* emission throughout ignition and onset of flame-front propagation in a combustion chamber with a large optical access via a quartz window. OH* measurements have been recorded via a high-speed optical camera (5 kHz) coupled with 308 nm optical filter and image intensifier. Sealing material swelling tests have yielded a perfluoroelastomer (FFKM 72) as an ideal, cost-efficient material regardless of the applied fuel. Comparative measurements with both ignition systems for combustion of gasoline as well as moderate blend admixtures of OME1 and DMC have demonstrated the superior ignition stability with likewise implications on flame-kernel development for the corona ignition. Furthermore a strong influence of the mode of discharge on OH* formation rates was observed especially for the oxygenic blends. Finally, for admixture variations of both oxygenates, an increased OH* level was shown during discharge thereby proving the hypothesis of a positive superimposition of oxygenic fuel and corona ignition system.

show abstract

“…Low-temperature plasma (LTP)-based ignition systems represent an innovative concept able to overcome the abovementioned limits and to extend the engine stable operating conditions [22,23] by promoting an early flame development at lean and/or diluted conditions [24][25][26]. Besides the thermal effect typical of the traditional spark [27], these systems reduce the mixture ignition delay and enhance the combustion process by means of kinetic and transport effects [28,29].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the control strategy is simplified and the operating range is extended to regions otherwise inaccessible with other LTP igniters. Moreover, the insulator surface shields the igniter-core from electrical erosion [32,22] and chemical exposition of the active species produced during the discharge [47,48].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Lean Stable Limit of a Barrier Discharge Igniter and of a Streamer-Type Corona Igniter at Different Engine Loads in a Single-Cylinder Research Engine

Ricci

Petrucci

Cruccolini

et al. 2020

The First World Energies Forum—Current and Future Energy Issues

View full text Add to dashboard Cite

Currently, the Radio-Frequency Corona Ignition systems represent an important solution for reducing pollutant emissions and fuel consumption related to Internal Combustion Engines, while at the same time ensuring high performance. These igniters are able to extend the lean stable limit by increasing the early flame growth speed. Kinetic, thermal, and ionic effects, together with the peculiar configuration of the devices, allow the combustion process to start in a wider region than the one involved with the traditional spark. In this work two corona igniters, namely a Barrier Discharge Igniter and a Corona Streamer Igniter, were tested in a single-cylinder research engine fueled with gasoline at different engine loads in order to investigate the igniters’ performance through indicated analysis and pollutant emissions analysis. For each operating point, the devices’ control parameters were set to ensure maximum energy releasement into the medium with the aim of investigating, at the extreme operating conditions, the capability of the devices to extend the lean stable limit of the engine. The corona igniters were tested on a constant volume calorimeter as well, reproducing the engine pressure conditions at the corresponding ignition timing. The target was to give an estimation of the thermal energy released during the discharge and then to compare their capability to provide high-stability energy.

show abstract

Fundamental Analysis of Combustion Initiation Characteristics of Low Temperature Plasma Ignition for Internal Combustion Gasoline Engine

Cited by 37 publications

References 7 publications

Experimental characterisation of the thermal energy released by a Radio-Frequency Corona Igniter in nitrogen and air

Experimental characterisation of the thermal energy released by a Radio-Frequency Corona Igniter in nitrogen and air

Investigations on Spark and Corona Ignition of Oxymethylene Ether-1 and Dimethyl Carbonate Blends with Gasoline by High-Speed Evaluation of OH* Chemiluminescence

Investigation of the Lean Stable Limit of a Barrier Discharge Igniter and of a Streamer-Type Corona Igniter at Different Engine Loads in a Single-Cylinder Research Engine

Contact Info

Product

Resources

About