Flame stabilization using a plasma discharge in a lifted jet flame

Kim, W.

doi:10.2514/6.2005-931

Cited by 17 publications

(17 citation statements)

References 10 publications

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“…As mentioned earlier, the flow actuation mechanism can be described by the action of two consecutive processes: ion generation by electron collisions, and directional flow formation by the electric field. Although the USRD is believed to be a more efficient source of ions in comparison to the AC DBD [15][16][17][18][19] , its short electric field duration (~ 30 ns) diminishes its flow control ability. We surmise that the ions generated during the discharge pulse are not effectively accelerated between the electrode gap (and hence do not transfer their momentum to the boundary layer fluid) due to the lack of persistence in the electric field.…”

Section: A Comparison Of Usrd and Ac Dbdmentioning

confidence: 99%

“…Here, we test and compare the flow control capabilities of conventional alternating current (AC) DBDs and ultra short repetitively pulsed plasma discharges (USRD). The comparison was motivated by evidence that a USRD generates a more highly nonequilibrium discharge when compared to the AC DBD [15][16][17][18][19] . Based on further comparisons carried out here, we have performed more detailed parametric studies of varying velocity, surface roughness, Reynolds number and electrode configuration using AC DBDs, which have proven to be more effective in this particular application.…”

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confidence: 99%

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Bluff Body Flow Separation Control Using Surface Dielectric Barrier Discharges

Kim

Mungal

et al. 2007

45th AIAA Aerospace Sciences Meeting and Exhibit

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Surface dielectric barrier discharges (DBDs) are used to delay flow separation behind a bluff body in atmospheric pressure air. The bluff body is made by connecting a flat plate to a half cylinder tangentially as a round-cornered trailing edge. Four DBD plasma actuators are attached along the surface of the half cylinder. Particle Image Velocimetry (PIV) is utilized for studying the velocity field of the flow. In the first part of the study, flow alteration effects of two different discharge sources-a conventional alternating current (AC) discharge and an ultra short repetitively pulsed plasma discharge (USRD)-are compared for identical surface DBD configurations. It is found that, at an identical discharge power (~ 25 W), the AC discharge shows higher ability for flow alteration than the USRD. In the second part, the flow alteration effect of the AC DBD is investigated for varying free stream flow speeds, surface roughness, Reynolds number (Re x), and electrode configuration. The flow speed ranges from 10 m/s to 25 m/s and the corresponding Re x are from 5 × 10 4-5 × 10 5. In this flow regime, the separation point behind the bluff body can be moved downstream in the presence of the AC DBD. However, it is found that, as the flow speed increases, the separation delay effect decreases. The flow alteration effect also decreases with rougher surfaces and higher Re x. Finally, skewed electrodes and reversed electrodes relative to the flow direction are utilized as two different electrode configurations. It is seen that the skewed electrode provides a positive effect on separation delay while the reversed electrode induces earlier flow separation.

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Section: A Comparison Of Usrd and Ac Dbdmentioning

confidence: 99%

mentioning

confidence: 99%

Bluff Body Flow Separation Control Using Surface Dielectric Barrier Discharges

Kim

Mungal

et al. 2007

45th AIAA Aerospace Sciences Meeting and Exhibit

Self Cite

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show abstract

“…Nanosecond repetitively pulsed gas discharges have been demonstrated recently for flame stabilization at low [5] and high [6]- [8] frequencies. However, the effectiveness of repetitively pulsed plasmas has not yet been investigated for the ignition of combustible mixtures.…”

Section: Introductionmentioning

confidence: 99%

Ignition of Propane&ndash;Air Mixtures by a Repetitively Pulsed Nanosecond Discharge

Pancheshnyi

Lacoste

Bourdon

et al. 2006

IEEE Trans. Plasma Sci.

286

169

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Results of an experimental study of the efficiency of the ignition of propane-air mixtures by a high voltage repetitively pulsed nanosecond gas discharge (10 kV, 10 ns, 30 kHz) are presented for the pressure range 0.35-2.0 bar. The measured minimal energy for ignition is found to decrease with the pressure. A significant reduction of the ignition delay and a decrease of the overall combustion duration were obtained by using a train of high-voltage pulses. Spectroscopic measurements in a 1-bar air just after a 10-pulse train (300 µs) of about 10 mJ in total energy show the presence of N, N + , O, and O + atomic species and a gas temperature increase up to 3000 K.Index Terms-Nanosecond plasma, plasma-assisted ignition, propane-air mixture inflammation, repetitively pulsed nanosecond discharge.

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“…This suggests that the physical characteristics of X-shaped flames are system-dependent and depend on more than just the combustion chemistry. Although many studies have been done on coaxial diffusion burners [13][14][15], there have been no studies of X-shaped flames. Therefore, the characteristics of X-shaped flames formed with a coaxial, premixed burner were studied and compared to those of NSF and polyhedral flames.…”

Section: Introductionmentioning

confidence: 98%

X-shaped flames consisting of rotating slant flamelets

Kurata

2008

Combustion and Flame

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Flame stabilization using a plasma discharge in a lifted jet flame

Cited by 17 publications

References 10 publications

Bluff Body Flow Separation Control Using Surface Dielectric Barrier Discharges

Bluff Body Flow Separation Control Using Surface Dielectric Barrier Discharges

Ignition of Propane&ndash;Air Mixtures by a Repetitively Pulsed Nanosecond Discharge

X-shaped flames consisting of rotating slant flamelets

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Flame stabilization using a plasma discharge in a lifted jet flame

Cited by 17 publications

References 10 publications

Bluff Body Flow Separation Control Using Surface Dielectric Barrier Discharges

Bluff Body Flow Separation Control Using Surface Dielectric Barrier Discharges

Ignition of Propane&amp;ndash;Air Mixtures by a Repetitively Pulsed Nanosecond Discharge

X-shaped flames consisting of rotating slant flamelets

Contact Info

Product

Resources

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Ignition of Propane–Air Mixtures by a Repetitively Pulsed Nanosecond Discharge