Plasma assisted combustion: effect of a coaxial DBD on a methane diffusion flame

Abstract

An experimental study of plasma assisted combustion has been initiated at ONERA in order to evaluate the potential application to supersonic combustion with various fuels. For this first step, we choose an easier and more versatile configuration where a coaxial dielectric barrier discharge is applied to a methane diffusion flame. The effects of this discharge on the flame structure and especially the reduction in its detachment height have been investigated. The role of the large scale motion of the flame on its anchoring by the plasma has then been revealed, along with the presence of a plasma channel linking the flame to the burner. Electrical and optical investigations demonstrated the pulsed nature of the light emission of the plasma and the spectroscopic study of OH, CH and N * 2 exhibits a 10 mm overlap between the plasma and the flame.

A review on plasma combustion of fuel in internal combustion engines

“…For all the saturated hydrocarbons, validated kinetic models exist from methane to n-decane at temperatures >1000 to 1200 K and pressure ranges from several torr to several atmospheres. 56,57 The validation results based on this experimental method indicate the potential of applying high-temperature-based plasma combustion. At high temperatures, the heating of combined homogenous nonequilibrium excitation due to gas discharge and the mixture must be regulated to overcome the difficulty encountered during plasma experiments.…”

“…Furthermore, validation for fast ionization wave of chemical systems has also been carried out. 56,57 The validation results based on this experimental method indicate the potential of applying high-temperature-based plasma combustion. [58][59][60]62,63…”

“…However, some formation of homogenous gas, especially in reactors with 5 cm diameter chamber or below, could result in low-pressure conditions, thereby leading to a critical voltage rise time of approximately 8 nanoseconds. In a view to overcome this drawback regarding to the application of plasma, several researchers have proposed the use of a DBD 56,57 . Subsequently, the ignition time in premixed, preheated hydrogen air and ethylene air flows excited by a repetitive nanosecond pulse charge in plane-to-plane DBD geometry was measured by using the same procedure.…”

Origin of activated combustion in steady-state premixed burner flame with superposition of dielectric barrier discharge

“…In addition, combustion in speedy flow becomes possible by the superposition of a plasma. [7][8][9][10][11][12] The increase in burning velocity [13][14][15][16][17][18][19][20][21] and the improvement of ignition characteristics [22][23][24][25][26][27][28] have been observed in plasma-assisted combustion.…”

Study of Periodic Forcing with a Dielectric Barrier Discharge Device for the Control of Flow Separation on a NACA 0012

“…The U.S Environmental Protection Agency has even studied the use of plasma devices including DBD for air pollution control[28]. Plasma assisted ignition and combustion have also become a noted area of study due to their possible applications for high speed flow combustion in devices such as supersonic/hypersonic jet engines[29] [30]. Various forms of surface cases on a range of materials have also increased interest in applications of DBDs.…”