Results from Gasoline and CNG Engine Tests with the Corona Ignition System EcoFlash

Schenk, Alexander; Rixecker, Georg; Bohne, Steffen

doi:10.1364/lic.2015.w4a.4

Cited by 11 publications

(3 citation statements)

References 0 publications

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“…Larger E/N is used to shorten the ignition delay time, as marked by the red star where E/N increased from 100 Td to 112 Td. The conclusion is consistent with previous findings that increasing discharge voltage and energy can lead to successful ignition by nonequilibrium plasma for severe conditions Schenk et al, 2015).…”

Section: Parameter Sensitivitysupporting

confidence: 93%

“…However, they may suffer from flammability limits and unstable combustion (Cho and He, 2007;Ju et al, 2011). The mechanism of a spark plug on ignition is to form a thermal equilibrium arc, whereas most of the discharge power is expended in heating spark plug electrodes Schenk et al, 2015), and only the remaining energy is deposited into mixture via thermal ionization and Joule heating.…”

Section: Introductionmentioning

confidence: 99%

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The numerical simulation of nanosecond-pulsed discharge-assisted ignition in lean-burn natural gas HCCI engines

Ban

Zhang²,

Zhong³

et al. 2022

Front. Mech. Eng.

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A plasma-assisted internal combustion engine model is established based on detailed plasma kinetics, combustion kinetics, and physical compression/expansion processes. The effects of nanosecond repetitively pulsed discharge (NRPD) on plasma-assisted ignition characteristics of mixtures under different fuel concentrations are studied under HCCI engine-relevant conditions. The coupled plasma and chemical kinetic model are validated with experiments. The comparison between NRPD and thermal ignition with a certain amount of input energy is carried out, and the results show that the former can ignite a mixture owing to the kinetic effect of nonequilibrium plasma, but the latter cannot ensure ignition. Path flux analysis shows that excited states and electrons react with fuel, providing O and H directly, increasing the possibility of ignition at a low temperature. The effect of NRPD on combustion performance under various equivalence ratios (φ) is investigated. It was found that in ICEs with NRPD, the ignition delay time under the lean-burn condition (φ = 0.5) is the shortest among three demonstrative cases. Even though the leaner mixture case with φ = 0.2 is more favorable for the production of O and OH during the discharge, after discharge, the heat release in case 2 with φ = 0.5 dramatically increases, resulting in the temperature exceeding that in the ultra-lean case. As the piston moves up, the higher amounts of CH3, HO2, and H2O2 as well as higher temperature for the lean-burn (φ = 0.5) case lead to the rapid increase of OH and O, which accelerates the consumption of methane and finally the earliest hot ignition near TDC. Finally, a series of parameter studies are performed to show the effects of E/N, current density, φ, and discharge timing on the ignition process. The results suggest that discharge parameters E/N and current density together with discharge timings and equivalence ratios can improve ignitability in internal combustion engines.

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Section: Parameter Sensitivitysupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

The numerical simulation of nanosecond-pulsed discharge-assisted ignition in lean-burn natural gas HCCI engines

Ban

Zhang²,

Zhong³

et al. 2022

Front. Mech. Eng.

View full text Add to dashboard Cite

show abstract

“…Typically, advanced ignition systems attempt to overcome the ignition limit by increasing either their output energy (e.g., dual-coil ignition [10,11], Controlled Electronic Ignition [12]) or the effectiveness of the spark-to-gas energy transfer (e.g. microwave-assisted spark ignition [13,14], corona ignition [15,16,17], nanosecond-pulsed transient-plasma ignition [18,19], breakdown ignition [4], laser ignition [20]). On the other hand, these systems attempt to overcome the partial-burn limit by some combination of increasing the flame-propagation rate (e.g., microwave-assisted ignition [21,22]) or reducing the flame-travel distance within the cylinder (multi-plug ignition [23], high-frequency corona ignition [24,25,17]).…”

Section: Ignition Limitsmentioning

confidence: 99%

Infrared Borescopic Evaluation of High-Energy and Long-Duration Ignition Systems for Lean/Dilute Combustion in Heavy-Duty Natural-Gas Engines

Mazacioglu¹,

Groß²,

Kern³

et al. 2018

SAE Technical Paper Series

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N atural gas (NG) is attractive for heavy-duty (HD) engines for reasons of cost stability, emissions, and fuel security. NG cannot be reliably compressionignited, but conventional gasoline ignition systems are not optimized for NG and are challenged to ignite mixtures that are lean or diluted with exhaust-gas recirculation (EGR). NG ignition is particularly challenging in large-bore engines, where completing combustion in the available time is more difficult. Using two high-speed infrared (IR) cameras with borescopic access to one cylinder of an HD NG engine, the effect of ignition system on the early flame-kernel development and cycle-to-cycle variability (CCV) was investigated. Imaging in the IR yielded strong signals from water emission lines, which located the flame front and burned-gas regions and obviated image intensifiers. A 9.7-liter, six-cylinder engine was modified to enable exhaust-gas recirculation and to provide optical access. Three ignition technologies were studied: a conventional system delivering 65 mJ of energy to each spark, a high-energy conventional system delivering 140 mJ, and a Bosch Controlled Electronic Ignition (CEI) system. CEI uses electronics to extend the ignition event, yielding sparks up to 5 ms in duration with up to 300 mJ of energy. Air/fuel equivalence ratios, λ, as high as 1.6 (with minimum EGR) and EGR fractions as high as 23% (stoichiometric) were tested; ignition delay, engine-out emissions, fuel consumption and image-derived parameters were compared. In most lean or dilute cases, the 140-mJ system yielded the lowest CCV. The imagery provided information about the early stages of ignition and combustion, where pressure measurements are not reliable. Image-based metrics also revealed that early flame kernels located further from the head yielded better combustion, showing that borescopic IR imaging can provide guidance for future engine design. INFRARED BORESCOPIC EVALUATION OF HIGH-ENERGY AND LONG-DURATION IGNITION SYSTEMS

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Influence of Nanoseconds Pulsed Discharges on the Composition of Intermediate and Final Combustion Products in the HCCI Engine

Филимонова

Bocharov

Dobrovolskaya

et al. 2019

Plasma Chem Plasma Process

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Results from Gasoline and CNG Engine Tests with the Corona Ignition System EcoFlash

Cited by 11 publications

References 0 publications

The numerical simulation of nanosecond-pulsed discharge-assisted ignition in lean-burn natural gas HCCI engines

The numerical simulation of nanosecond-pulsed discharge-assisted ignition in lean-burn natural gas HCCI engines

Infrared Borescopic Evaluation of High-Energy and Long-Duration Ignition Systems for Lean/Dilute Combustion in Heavy-Duty Natural-Gas Engines

Influence of Nanoseconds Pulsed Discharges on the Composition of Intermediate and Final Combustion Products in the HCCI Engine

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