Active Control of Lifted Flames with Arrayed Micro Actuators

Kurimoto, Naoki; Suzuki, Yuji; Kasagi, Nobuhide

doi:10.1299/kikaib.71.191

Cited by 4 publications

(2 citation statements)

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“…In order to reduce harmful emissions in practical combustors, various techniques such as high-temperature air combustion (1) and a turbulence generator at the exit of fuel jet (2) have been adopted. These techniques can be used only for steady state combustion.…”

Section: Introductionmentioning

confidence: 99%

Burned Gas Characteristics of Laminar Lifted Flame at the Beginning of Stream Heating

Hirota

Oso

Masuya

2011

JTST

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This research experimentally investigates the exhaust gas characteristics of a methane-air lifted-jet flame with elevated stream temperatures up to 450 K. Emission indices of NO x and CO were measured by direct gas sampling using a gas detector tube. The index of NO x decreased or did not change with increasing stream temperature up to 350 K, and then increased with further temperature increases. The index of CO changed in an opposite manner to that of NO x with increasing stream temperature. These tendencies demonstrated that the generation of emission gases did not monotonically increase with stream temperature. These non-monotonic properties of the emission indices were caused by particular variations in the lift-off height of flame and flame length. In order to examine these flame characteristics, we measured the flame curvature with OH-PLIF and related it to the lift-off height of triple flame. These flame properties could explain the unique emission characteristics of a lifted-jet flame with stream heating.

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Section: Introductionmentioning

confidence: 99%

Burned Gas Characteristics of Laminar Lifted Flame at the Beginning of Stream Heating

Hirota

Oso

Masuya

2011

JTST

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“…Chao et al (5) tried to improve the lifted flame stability using eight piezoelectric actuators around the burner exit, driving them with a phase difference to generate vortices. Kurimoto et al (6) used flap-like micro-actuators to actively control the lifted flame, producing fluctuations in the shear layer between the inner and outer flow of a coaxial jet. Ogawara et al (7) used a synthetic jet system driven by a loudspeaker to actively control the lifted flame height.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Laminar Lifted Flame Stability Excited by High-Frequency Acoustic Oscillation

Hirota

Hashimoto

Oso

et al. 2009

JTST

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A high-frequency (20kHz) standing wave was applied to the unburned mixture upstream of a methane-air lifted jet flame using a bolt-clamped Langevin transducer (BLT) to improve stability. The flow field near the flame was visualized using acetone planar-laser-induced fluorescence (PLIF). The standing wave decreased the lifted flame height and increased the blow-off limit. The upstream flow field of the center jet then bent. This phenomenon appeared when there was a density difference between the center jet and the surrounding secondary flow. When the density of the center jet was less than that of the co-flow, the center jet was redirected to the pressure anti-node side. Conversely, when the density of the center jet was greater than that of the co-flow, the center jet was redirected to the pressure node side. This redirection tended to stabilize the laminar lifted flame.

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Soot control of laminar jet-diffusion lifted flame excited by high-frequency acoustic oscillation

Hirota

Nakamura

Saito

2017

JTST

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Active Control of Lifted Flames with Arrayed Micro Actuators

Cited by 4 publications

References 0 publications

Burned Gas Characteristics of Laminar Lifted Flame at the Beginning of Stream Heating

Burned Gas Characteristics of Laminar Lifted Flame at the Beginning of Stream Heating

Improvement of Laminar Lifted Flame Stability Excited by High-Frequency Acoustic Oscillation

Soot control of laminar jet-diffusion lifted flame excited by high-frequency acoustic oscillation

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