Research and Development of Microwave Plasma Combustion Engine (Part II: Engine Performance of Plasma Combustion Engine)

Ikeda, Yuji; Nishiyama, Atsushi; Katano, Hiroki; Kaneko, Masashi; Jeong, Haeyoung

doi:10.4271/2009-01-1049

Cited by 39 publications

(28 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This technology has potential in realizing combustion of lean fuels [2][3][4][5][6] and water-containing biomass fuels. In addition, combustion in speedy flow becomes possible by the superposition of a plasma.…”

Section: Introductionmentioning

confidence: 99%

Origin of activated combustion in steady-state premixed burner flame with superposition of dielectric barrier discharge

Zaima

Akashi

Sasaki

2015

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

The objective of this work is to understand the mechanism of plasma-assisted combustion in a steadystate premixed burner flame. We examined the spatiotemporal variation of the density of atomic oxygen in a premixed burner flame with the superposition of dielectric barrier discharge (DBD). We also measured the spatiotemporal variations of the optical emission intensities of Ar and OH. The experimental results reveal that atomic oxygen produced in the preheating zone by electron impact plays a key role in the activation of combustion reactions. This understanding is consistent with that described in our previous paper indicating that the production of "cold OH(A 2 Σ + )" via CHO + O → OH(A 2 Σ + ) + CO has the sensitive response to the pulsed current of DBD [K. Zaima and K. Sasaki, Jpn. J. Appl. Phys. 53, 110309 (2014)].

show abstract

Section: Introductionmentioning

confidence: 99%

Origin of activated combustion in steady-state premixed burner flame with superposition of dielectric barrier discharge

Zaima

Akashi

Sasaki

2015

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…A driving force is the demand to avoid global warming due to the greenhouse effect since more than 80% of fossil fuels are consumed by combustion. Recently, plasmaassisted combustion has been investigated as an innovative technology [1], which is expected to be useful for combustion in a lean-fuel condition [2,3] and in a speedy flow [4][5][6]. In addition, it is considered that plasmas can be utilized for improving the ignition characteristics [7][8][9][10][11] and the stability of flames [12,13].…”

Section: Introductionmentioning

confidence: 99%

Transition from equilibrium to nonequilibrium combustion of premixed burner flame by microwave irradiation

Sasaki¹,

Sueoka²

2012

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Abstract.We found that the burning velocity in premixed burner flame was enhanced by heated electrons in the flame. The electron heating was realized by irradiating microwave power onto the flame, and was confirmed by observing optical emission intensity of molecular nitrogen at the second positive system. Since the increase of the observed gas temperature was negligible, the enhancement of the burning velocity can be attributed to the nonequilibrium combustion chemistry which is driven by energetic electrons. We examined the time constants for the transition between equilibrium and nonequilibrium combustion states by irradiating pulsed microwave power. As a result, we found > 2 × 10 4 s −1 for the frequency of electron heating, ∼ 1 × 10 3 s −1 for the loss frequency of heated electrons, and ∼ (0.5 − 1) × 10 3 s −1 for the loss frequencies of OH and CH radicals.

show abstract

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Research and Development of Microwave Plasma Combustion Engine (Part II: Engine Performance of Plasma Combustion Engine)

Cited by 39 publications

References 16 publications

Origin of activated combustion in steady-state premixed burner flame with superposition of dielectric barrier discharge

Origin of activated combustion in steady-state premixed burner flame with superposition of dielectric barrier discharge

Transition from equilibrium to nonequilibrium combustion of premixed burner flame by microwave irradiation

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

Contact Info

Product

Resources

About