Plasma-enhanced mixing and flameholding in supersonic flow

Firsov, A. A.; Savelkin, Konstantin; Yarantsev, Dmitry; Leonov, Sergey B.

doi:10.1098/rsta.2014.0337

Cited by 48 publications

(18 citation statements)

References 34 publications

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“…[69][70][71][72][73] However, the temperature of the arc discharge is usually several thousand kelvins, and the noticeable improvement in combustion is influenced by the thermal effect. There exist a large number of experimental studies that utilized plasma torches for ignition and flame holding in supersonic flows.…”

Section: Kinetics Above Self-ignition Threshold For Plasma Combustionmentioning

confidence: 99%

“…There exist a large number of experimental studies that utilized plasma torches for ignition and flame holding in supersonic flows. [69][70][71][72][73] However, the temperature of the arc discharge is usually several thousand kelvins, and the noticeable improvement in combustion is influenced by the thermal effect. Thus, the use of an arc discharge could be inefficient for combustion improvement because of high energy consumption and poor chemical selectivity.…”

Section: Applications Of Plasma Combustion In Internal Combustion Ementioning

confidence: 99%

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A review on plasma combustion of fuel in internal combustion engines

et al. 2017

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Summary In recent years, new ways of improving the combustion efficiency of fuel during gas turbine operations have been developed. The most significant has been the application of plasma technology for the combustion of fuel in gas turbine operations. Plasma is formed when gas is exposed to either high temperature or high‐voltage electricity. This technology is very promising and has proven to enhance the performance of gas turbines and reduce toxic emissions. Recent studies have shown the use of different types of plasma applications in gas turbine operations such as plasma torch, filamentary discharge, and nanosecond pulse discharge, whose results show that plasma technology has great potential in improving flame stabilization, the fuel/air mixing ratio, and flash point values of these fuels. These findings and advances have further provided new opportunities in the development of efficient plasma discharges for practical uses in plasma combustion of fuel for gas turbine operations. This article is a comprehensive overview of the advances and blind spots in the knowledge of plasma combustion of fuel during internal combustion engine operations. This review also focuses on applications, methods, and experimental results in plasma combustion of fuel in gas turbines.

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Section: Kinetics Above Self-ignition Threshold For Plasma Combustionmentioning

confidence: 99%

Section: Applications Of Plasma Combustion In Internal Combustion Ementioning

confidence: 99%

A review on plasma combustion of fuel in internal combustion engines

et al. 2017

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“…A near-surface discharge between flush-mounted electrodes installed on a plane wall has been utilized in serial work on duct-driven flow control and for plasma-assisted supersonic combustion experiments [19,13,21,22,23,24]. Due to the unsteady pattern of the individual plasma filaments this type of electrical discharge is called a "Quasi-DC" or Q-DC discharge.…”

Section: Introductionmentioning

confidence: 99%

Controllable Shock Wave Generation by Near-Surface Electrical Discharge

Leonov

Houpt

Hedlund

et al. 2016

47th AIAA Plasmadynamics and Lasers Conference

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This experimental work explores the physical processes related to an interaction of a nearsurface Quasi-DC (Q-DC) electrical discharge with supersonic airflow. The study is performed in the Supersonic Test Rig SBR-50 at the University of Notre Dame at Mach Number M = 2, stagnation pressure P0 = 0.9-2.6 Bar, stagnation temperature T0=300K, Reynolds Number ReL = 7-25 10 6 m -1 , test cell dimensions 76×76×610mm with 1º two walls divergence, and plasma power W= 5-16 kW. The plasma power and temperature are measured with current-voltage probes and optical emission spectroscopy. An unsteady pattern of interaction is depicted by high-speed image capturing. The result of the interaction is characterized by means of pressure measurements and schlieren visualization. It is demonstrated that the plasma generation causes the appearance of a wedge-shaped displacement layer and an oblique shock wave (SW). The strength of the SW is a rising function of the plasma power; the position of the impinged zone on the opposite wall can be electronically regulated. The resulting pressure amplification has been described for the configurations included; both a fixed SW generator and the plasma-based SW generator. It is considered that the Q-DC discharge may be employed for active control of duct-driven flows, cavity-based flow, and, finally, for control of ignition / flameholding in a supersonic combustor.

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“…Referencing just a few, the papers [1,[16][17][18][19][20] give an initial impression on the field of PAC applications. In recent years, a few schemes of plasma-based actuators for supersonic combustion have been tested for flameholding purposes at flow conditions where self-ignition of the fuel/air mixture is not realizable due to low air temperatures [1,[21][22][23][24][25][26]. These works demonstrated the potential of plasma-based techniques to improve combustion stability under supersonic flow conditions.…”

Section: Introductionmentioning

confidence: 99%

“…This problem is partially resolved due to the non-equilibrium, non-uniform, and transient nature of electrical discharges, which deliver a synergy with thermal effects (heating). Those properties may be of critical importance for enhancing air-fuel mixing in compressible flows under non-premixed flow conditions [24,29,30]. Plasma-based ignition is the main focus, but mixing enhancement by plasma is the second principal focus of this work.…”

Section: Introductionmentioning

confidence: 99%

Electrically Driven Supersonic Combustion

Leonov

2018

Energies

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This manuscript reviews published works related to plasma assistance in supersonic combustion; focusing on mixing enhancement, ignition and flameholding. A special attention is paid for studies, which the author participated in person. The Introduction discusses general trends in plasma-assisted combustion and, specifically, work involving supersonic conditions. In Section 2, the emphasis is placed on different approaches to plasma application for fuel ignition and flame stabilization. Several schemes of plasma-based actuators for supersonic combustion have been tested for flameholding purposes at flow conditions where self-ignition of the fuel/air mixture is not realizable due to low air temperatures. Comparing schemes indicates an obvious benefit of plasma generation in-situ, in the mixing layer of air and fuel. In Section 3, the problem of mixing enhancement using a plasma-based technique is considered. The mechanisms of interaction are discussed from the viewpoint of triggering gasdynamic instabilities promoting the kinematic stretching of the fuel-air interface. Section 4 is related to the description of transitional processes and combustion instabilities observed in plasma-assisted high-speed combustion. The dynamics of ignition and flame extinction are explored. It is shown that the characteristic time for reignition can be as short as 10 ms. Two types of flame instability were described which are related to the evolution of a separation zone and thermoacoustic oscillations, with characteristic times 10 ms and 1 ms correspondingly.

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Plasma-enhanced mixing and flameholding in supersonic flow

Cited by 48 publications

References 34 publications

A review on plasma combustion of fuel in internal combustion engines

A review on plasma combustion of fuel in internal combustion engines

Controllable Shock Wave Generation by Near-Surface Electrical Discharge

Electrically Driven Supersonic Combustion

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