Microwave Enhanced Ignition Process for Fuel Mixture at Elevated Pressure of 1MPa

Ikeda, Yuji; Nishiyama, Atsushi; Kaneko, Masashi

doi:10.2514/6.2009-223

Cited by 36 publications

(25 citation statements)

References 17 publications

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“…This method can also be referred as plasma enhanced ignition because the main idea is to create as much plasma as possible at the initial ignition time so as to improve ignition and combustion performance. Through experiments in single-cylinder research engines, the combustion stability is improved and the lean limit of equivalence ratio is increased from 0.59 to 0.49 [36].…”

Section: A Molecule Resonant Breakdownmentioning

confidence: 99%

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Survey of greener ignition and combustion systems for internal combustion engines

Luo

Tian

et al. 2015

2015 21st International Conference on Automation and Computing (ICAC)

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Abstract-The spark and compression ignition principles of petrol and diesel internal combustion engines (ICEs) have not advanced for a century. These do not lead to complete combustion and hence result in high exhaust emission and low energy efficiency. This paper presents a comprehensive survey on the attempts and developments of greener ignition and combustion systems for ICEs and points out that homogeneous charge microwave ignition (

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Section: A Molecule Resonant Breakdownmentioning

confidence: 99%

“…Makita and Ikeda patented an apparatus for ignition with microwave as assistance [36,37]. It adopts a similar ignition structure as spark plug.…”

Section: A Molecule Resonant Breakdownmentioning

confidence: 99%

Survey of greener ignition and combustion systems for internal combustion engines

Luo

Tian

et al. 2015

2015 21st International Conference on Automation and Computing (ICAC)

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“…Furthermore, increasing the combustion rate with advanced ignition systems [7,8] could be used to extend the knock limit. Direct injection compression ignition is also a promising route to achieve higher efficiencies if the injectors can be made more reliable.…”

Section: 1operation With H 2 -O 2 -Armentioning

confidence: 99%

Increased efficiency in SI engine with air replaced by oxygen in argon mixture

Killingsworth

Rapp

Flowers

et al. 2011

Proceedings of the Combustion Institute

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Basic engine thermodynamics predicts that spark ignited engine efficiency is a function of both the compression ratio of the engine and the specific heat ratio of the working fluid. In practice the compression ratio of the engine is often limited due to knock. Both higher specific heat ratio and higher compression ratio lead to higher end gas temperatures and increase the likelihood of knock. In actual engine cycles, heat transfer losses increase at higher compression ratios and limit efficiency even when the knock limit is not reached. In this paper we investigate the role of both the compression ratio and the specific heat ratio on engine efficiency by conducting experiments comparing operation of a single-cylinder variable-compression-ratio engine with both hydrogen-air and hydrogen-oxygen-argon mixtures. For low load operation it is found that the hydrogen-oxygen-argon mixtures result in higher indicated thermal efficiencies.Peak efficiency for the hydrogen-oxygen-argon mixtures is found at compression ratio 5.5 whereas for the hydrogen-air mixture with an equivalence ratio of 0.24 the peak efficiency is found at compression ratio 13. We apply a three-zone model to help explain the effects of specific heat ratio and compression ratio on efficiency. Operation with hydrogen-oxygen-argon mixtures at low loads is more efficient because the lower compression ratio results in a substantially larger portion of the gas to reside in the adiabatic core rather than in the boundary layer and in the crevices, leading to less heat transfer and more complete combustion.

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“…Although the microwave-assisted spark plug has proven effective for gasoline-fueled engines operating under lean conditions [17,20,21], its effectiveness has not previously been demonstrated for use on engines burning methanebased fuels (such as natural gas). For this study, a singlecylinder engine burning methane-air was modified to operate using a microwave-assisted spark plug system.…”

Section: Introductionmentioning

confidence: 99%

“…High-energy electrons, having received energy from microwaves, can enhance mixture reactivity through electron impact reactions which generate radicals and metastable electronically excited chemical species [19]. Past studies have shown that a microwave-assisted spark plug can extend the lean limit of gasoline-fueled engines [17,20,21] and that microwaves can enhance flame speed in wall-stagnated methane flames [22].…”

Section: Introductionmentioning

confidence: 99%

Extending Lean Operating Limit and Reducing Emissions of Methane Spark-Ignited Engines Using a Microwave-Assisted Spark Plug

Rapp

DeFilippo

Saxena

et al. 2012

Journal of Combustion

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A microwave-assisted spark plug was used to extend the lean operating limit (lean limit) and reduce emissions of an engine burning methane-air. In-cylinder pressure data were collected at normalized air-fuel ratios of λ = 1.46, λ = 1.51, λ = 1.57, λ = 1.68, and λ = 1.75. For each λ, microwave energy (power supplied to the magnetron per engine cycle) was varied from 0 mJ (spark discharge alone) to 1600 mJ. At lean conditions, the results showed adding microwave energy to a standard spark plug discharge increased the number of complete combustion cycles, improving engine stability as compared to spark-only operation. Addition of microwave energy also increased the indicated thermal efficiency by 4% at λ = 1.68. At λ = 1.75, the spark discharge alone was unable to consistently ignite the air-fuel mixture, resulting in frequent misfires. Although microwave energy produced more consistent ignition than spark discharge alone at λ = 1.75, 59% of the cycles only partially burned. Overall, the microwave-assisted spark plug increased engine performance under lean operating conditions (λ = 1.68) but did not affect operation at conditions closer to stoichiometric.

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Microwave Enhanced Ignition Process for Fuel Mixture at Elevated Pressure of 1MPa

Cited by 36 publications

References 17 publications

Survey of greener ignition and combustion systems for internal combustion engines

Survey of greener ignition and combustion systems for internal combustion engines

Increased efficiency in SI engine with air replaced by oxygen in argon mixture

Extending Lean Operating Limit and Reducing Emissions of Methane Spark-Ignited Engines Using a Microwave-Assisted Spark Plug

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