Investigations of Undercritical MW Discharge with Volumetrically-Developed Streamer Structure in Propane-Air Supersonic Stream

Esakov, I. I.; Grachev, L. P.; Бычков, В. Л.; VanWie, David

doi:10.2514/6.2006-790

Cited by 8 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Electromagnetic beam is generated with a magnetron. Its output power is 1.5 kW, and wavelength is λ = 12.3 cm (this wavelength is one of the most common for microwave generating devices [27]). A typical outlet area of magnetron is 9 × 9 cm 2 .…”

Section: Methodsmentioning

confidence: 99%

“…There are various types of microwave discharges which have been realized depending on the pressure and electric intensity for different wavelengths [23][24][25][26][27]. Recent investigations have demonstrated a great potential of microwave discharges to ignite air/fuel mixtures at low-pressure [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…These experiments on the ignition of microwave streamer discharges in supersonic gas jets with velocities of up to 500 m/s have shown that discharges under these conditions are still streamer discharges. Some semi-empirical correlations describing various forms of streamer discharge are proposed in [24], and experimental results are presented in [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study of Air Breakdown Induced by Subcritical Streamer Microwave Discharge

Булат

Esakov

Grachev

et al. 2021

IEEE Trans. Plasma Sci.

Self Cite

View full text Add to dashboard Cite

Streamers are non-thermal filamentary plasmas developing in insulating mediums under the influence of strong external electric field. The subcritical streamer discharge is formed by a field with the intensity smaller than the minimum intensity leading to the air breakdown, and breakdown conditions are created by special initiators. Air breakdown in sub-and supersonic flows induced by the subcritical streamer discharge and the effect of the initiator shape on breakdown conditions are studied. The intensity of electric field of subcritical streamer induced breakdown has been shown to be smaller compared to that initiated by microwave discharge without initiator. The dependencies of critical intensity of the electric field on the pressure and location of initiator are reported. The air breakdown conditions are found at various dimensions of the metallic screen near which the initiator is installed.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Study of Air Breakdown Induced by Subcritical Streamer Microwave Discharge

Булат

Esakov

Grachev

et al. 2021

IEEE Trans. Plasma Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Electromagnetic beam is generated with a magnetron. Its output power is 1.5 kW, and wavelength is λ = 12.3 cm (this wavelength is one of the most common for microwave generating devices [30]). A typical outlet area of magnetron is 9 × 9 cm 2 .…”

Section: Methodsmentioning

confidence: 99%

Plasma-assisted ignition and combustion of lean and rich air/fuel mixtures in low- and high-speed flows

et al. 2020

View full text Add to dashboard Cite

A stabler ignition and combustion of the premixed air/fuel mixture remains a topic of great interest due to the high demand for effective and efficient propulsion systems in aerospace applications. Extensive experimental studies and numerical simulations have been carried out to understand and develop ignition systems using cold and non-thermal plasma in microwave streamer discharges. Use of sub-critical streamer discharge allows to ignite air/fuel mixture by an external electric field whose intensity is significantly lower than the intensity required to induce air breakdown. Ignition and combustion of air/propane mixture by microwave sub-critical streamer discharge in low-and high-speed flows is studied experimentally. Qualitative (flame structure) and quantitative (size of combustion region, temperature distributions) characteristics of the flame zone are provided for different flow speeds and equivalence fuel/air ratios, and conditions of discharge initiation with metallic microwave vibrator are studied. The streamer discharge makes it possible to create multiple ignition points providing almost instantaneous ignition of entire volume of the mixture. The results show that the sub-critical streamer discharge can potentially be used in various applications providing more rapid and efficient combustion.

show abstract

“…This paper have been devoted to the study the ignition and combustion characteristics of gaseous propane-air mixtures in a supersonic (SS) air stream in the region of a microwave (MW) gaseous discharge. Results from earlier stages of these investigations were presented in [1]- [5].…”

Section: Introductionmentioning

confidence: 99%

Propane–Air Mixture Combustion Assisted by MW Discharge in a Speedy Airflow

Esakov¹,

Grachev²,

Khodataev³

et al. 2006

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

In this paper, results are presented from an experimental investigation of propane-air combustion in a stationary microwave (MW) discharge at different conditions. In these experiments, a deeply undercritical discharge is initiated in the base of an electromagnetic vibrator, which is immersed in cold supersonic airflow. Two schemes for mixing propane with air are considered. In the first scheme, a propane-air mixture is delivered through the vibrator and is ignited at the outlet from the vibrator. In the second scheme, propane delivered through the vibrator mixes with air captured by an inlet hole in the vibrator nose prior to being also ignited by the MW discharge at the base of the vibrator. Propane combustion with efficiency of approximately 60% was demonstrated at a mixture velocity up to 200 m/s in the combustion region. The heat release reaches approximately 1 kW at a propane mass flow rate of 2 · 10 −2 g/s and discharge power of approximately 200 W.Index Terms-High-speed combustion, microwave (MW) gas discharge, plasma-assisted burning.

show abstract

Investigations of Undercritical MW Discharge with Volumetrically-Developed Streamer Structure in Propane-Air Supersonic Stream

Cited by 8 publications

References 0 publications

Experimental Study of Air Breakdown Induced by Subcritical Streamer Microwave Discharge

Experimental Study of Air Breakdown Induced by Subcritical Streamer Microwave Discharge

Plasma-assisted ignition and combustion of lean and rich air/fuel mixtures in low- and high-speed flows

Propane–Air Mixture Combustion Assisted by MW Discharge in a Speedy Airflow

Contact Info

Product

Resources

About