Research and Development of Microwave Plasma Combustion Engine (Part I: Concept of Plasma Combustion and Plasma Generation Technique)

Ikeda, Yuji; Nishiyama, Atsushi; Wachi, Y.; Kaneko, Masashi

doi:10.4271/2009-01-1050

Cited by 43 publications

(40 citation statements)

References 5 publications

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“…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.

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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)].

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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.

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“…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.

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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.

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“…The flow rates of CH 4 , O 2 , and Ar were controlled at 0.38, 1.0, and 5.6 slm, respectively, using mass flow controllers. The equivalence ratio was 0.76.…”

Section: Methodsmentioning

confidence: 99%

Transient change in the shape of premixed burner flame with the superposition of pulsed dielectric barrier discharge

Zaima¹,

Sasaki²

2016

Jpn. J. Appl. Phys.

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We investigated the transient phenomena in a premixed burner flame with the superposition of a pulsed dielectric barrier discharge (DBD). The length of the flame was shortened by the superposition of DBD, indicating the activation of combustion chemical reactions with the help of the plasma. In addition, we observed the modulation of the top position of the unburned gas region and the formations of local minimums in the axial distribution of the optical emission intensity of OH. These experimental results reveal the oscillation of the rates of combustion chemical reactions as a response to the activation by pulsed DBD. The cycle of the oscillation was 0.18-0.2 ms, which could be understood as the eigenfrequency of the plasma-assisted combustion reaction system.

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Research and Development of Microwave Plasma Combustion Engine (Part I: Concept of Plasma Combustion and Plasma Generation Technique)

Cited by 43 publications

References 5 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

Transient change in the shape of premixed burner flame with the superposition of pulsed dielectric barrier discharge

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