An investigation of multiple spark discharge using multi-coil ignition system for improving thermal efficiency of lean SI engine operation

Jung, Dong‐Won; Iida, Norimasa

doi:10.1016/j.apenergy.2017.12.032

Cited by 83 publications

(17 citation statements)

References 35 publications

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“…Therefore, the rising of the energy transferred to the mix is mandatory for the spark plug system, in particular for high turbulence intensity [15,16]. This improvement is reached, for example, through the implementation of high-energy inductive ignition systems [3,17,18,19]. Unfortunately, this technology shows electrode ablation/erosion/fouling [11,20,21,22] where the plug electrodes widely affect the flame kernel development [23].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Furthermore, in SI engines the flame propagates by way of ignition by the spark plug and as a consequence the number of the ignition sites and their ST matters significantly [27]. Many studies have used the multiple ignition sites to burn the charge quickly by increasing the flame propagation rate, and achieved higher engine efficiency and reduced emissions [28,29]. However, Pasternak et al [27] and Chen et al [30] both observed the effect of multiple spark plug on the knock mechanism, and described knock as being more accessible by firing multiple sparks than by a single spark plug, and also deduced that knock intensity could be reduced if the spark location was chosen near to the position where autoignition could occur.…”

Section: Introductionmentioning

confidence: 99%

Using Multiple Ignition Sites and Pressure Sensing Devices to Determine the Effect of Air-Fuel Equivalence Ratio on the Morphology of Knocking Combustion

Uddeen¹,

Shi²,

Tang³

et al. 2022

SAE Technical Paper Series

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In spark-ignition combustion, knocking combustion inherently presents an interaction between the main flame front and end gas autoignition. Conventionally, it generates a high amplitude pressure wave traveling across the chamber that can be responsible for reducing the performance of the engine, and can cause heavy damage to engine components. In order to study the phenomenon in a controllable way, experiments were performed on a specialized single-cylinder research engine fitted with a liner equipped with four equi-spaced spark plugs in the side so as to propagate various flame topologies from those locations, and hence achieve more controlled knock events. In addition, six pressure transducers were employed at distinct locations to precisely record details of the autoignition event by monitoring the pressure oscillations, and with them the combustion characteristics and knock intensity. Various spark ignition approaches such as the spark timing (ST), the number of ignition sites, and the location of the active spark plugs were applied to analyze the knock attributes for different ignition strategies. It has been observed that the knock intensity of single spark ignition is normally weak, while increasing the activated plug number from one to three could remarkably increase the maximum amplitude of pressure oscillation (MAPO) and knock cycle numbers. However, four spark ignition mitigates the steep pressure spikes caused by knock, and reduces the MAPO to a lower level than triple spark ignition. . Since knock occurrence depends on the relative air-fuel ratio (λ), this paper also described the effect of rich and lean conditions (λ = 0.7, 0.9, 1.0, and 1.3), on knock instigation coupled with firing multiple spark ignition sites. The experimental results revealed that λ = 0.9 case shows the maximum knock propensity along with various high frequency acoustics modes due to higher heat release rate with faster flame propagation inside the chamber. However, for the same operating conditions λ = 0.7 and 1.0 gave slight to moderate knock.

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“…As stated earlier, the goal is to deliver improved engine power and reduce pollutant emissions. Several effective methods can be applied, such as: changing the intake manifold shape [1], using an alternative fuel [2,3], using a fuel injection system instead of a carburetor [4], determining optimal ignition timing [5], recovering lost heat [6], using a supercharger [7], and changing cam profiles [8]. Because valve mechanisms have a significant effect on engine performance and engine emission characteristics, a new valve mechanism design has the potential to improve the engine performance.…”

Section: Introductionmentioning

confidence: 99%

A Study to Investigate the Effect of Valve Mechanisms on Exhaust Residual Gas and Effective Release Energy of a Motorcycle Engine

Khoa

2021

Energies

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The purpose of this study was to investigate the effect of valve mechanisms on the exhaust residual gas (ERG) and effective release energy (ERE) of a motorcycle engine. Here, a simulation model and the estimation a new valve mechanism design is presented. An AVL-Boost simulation model and an experiment system were established. The classical spline approximation method was used to design a new cam profile for various valve lifts. The simulation model was used to estimate the effect of the new valve mechanism designs on engine performance. A new camshaft was produced based on the research data. The results show that the engine obtained a maximum engine brake torque of 21.53 Nm at 7000 rpm, which is an increase of 3.2% compared to the engine using the original valve mechanism. In addition, the residual gas was improved, the maximum engine effective release energy was 0.83 kJ, the maximum engine power was 18.1 kW, representing an improvement of 7.2%, and the air mass flow was improved by 4.97%.

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An investigation of multiple spark discharge using multi-coil ignition system for improving thermal efficiency of lean SI engine operation

Cited by 83 publications

References 35 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

Using Multiple Ignition Sites and Pressure Sensing Devices to Determine the Effect of Air-Fuel Equivalence Ratio on the Morphology of Knocking Combustion

A Study to Investigate the Effect of Valve Mechanisms on Exhaust Residual Gas and Effective Release Energy of a Motorcycle Engine

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