Parametric Study and Secondary Circuit Model Calibration Using Spark Calorimeter Testing

Abidin, Zainal; Chadwell, Christopher

doi:10.4271/2015-01-0778

Cited by 23 publications

(17 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a result, higher pressure means lower energy released to the gas medium for the same potential V e applied to the electrode, in agreement with [31,74]. This behaviour is the opposite of what seen and expected for the spark case [13,65], where a pressure increase pushes the released energy and the system efficiency to higher values. Fig.…”

Section: Accepted Manuscriptsupporting

confidence: 69%

“…3, plotted versus E s . The efficiency quickly increases with V e from 0% to beyond 20%, independently of p ch , at least four times more than the best efficiency showed by the spark [13,65]. The starting point and the particular trend instead, are functions of the pressure, according to the behaviour showed in fig.…”

Section: Accepted Manuscriptmentioning

confidence: 81%

“…If the bomb chamber is assumed as adiabatic [13] suitable as a first approximation for few milliseconds after the streamer event), the thermal energy E r , delivered to the chamber medium by the igniter, is given by the first law of the thermodynamics: where γ is the specific heat ratio, V ch is the chamber volume and ∆p = p max ch − p min ch , the pressure difference before and after the streamer event, respectively.…”

Section: Thermal Energy Assessmentmentioning

confidence: 99%

“…The increase of efficiency to transfer the primary energy (i.e. the energy supplied to the igniter primary circuit) to the air-to-fuel mix is critical [12] and, at present, it is widely below the 3% [13].…”

Section: Introductionmentioning

confidence: 99%

“…Generally speaking, the thermal energy delivered to the charge mix is a key parameter since it heavily affects the flame kernel formation and then a proper ignition [13], as the flame kernel growth leads an essential role [64]. Indeed, the chemical activity cannot be separated from the thermal phase, even if the radicals production is supposed to be the main feature of the plasma assisted igniter.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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