scholarly journals Numerical modelling of low-temperature non-equilibrium plasma of pulsing corona and breakdown

2007 ◽  
Vol 10 (2) ◽  
pp. 209 ◽  
Author(s):  
Chyhin ◽  
Karpyak
Keyword(s):  
Low Temperature ◽  
Numerical Modelling ◽  
Equilibrium Plasma ◽  
Non Equilibrium

scholarly journals Flow reactor studies of non-equilibrium plasma-assisted oxidation of n -alkanes

2015 ◽  
Vol 373 (2048) ◽  
pp. 20140344 ◽  
Author(s):  
Nicholas Tsolas ◽  
Jong Guen Lee ◽  
Richard A. Yetter
Keyword(s):  
Low Temperature ◽  
Fuel Consumption ◽  
Flow Reactor ◽  
Negative Temperature ◽  
Intermediate Species ◽  
Chain Branching ◽  
Temperature Changes ◽  
Equilibrium Plasma ◽  
Elevated Pressures ◽  
Non Equilibrium

The oxidation of n -alkanes (C 1 –C 7 ) has been studied with and without the effects of a nanosecond, non-equilibrium plasma discharge at 1 atm pressure from 420 to 1250 K. Experiments have been performed under nearly isothermal conditions in a flow reactor, where reactive mixtures are diluted in Ar to minimize temperature changes from chemical reactions. Sample extraction performed at the exit of the reactor captures product and intermediate species and stores them in a multi-position valve for subsequent identification and quantification using gas chromatography. By fixing the flow rate in the reactor and varying the temperature, reactivity maps for the oxidation of fuels are achieved. Considering all the fuels studied, fuel consumption under the effects of the plasma is shown to have been enhanced significantly, particularly for the low-temperature regime ( T <800 K). In fact, multiple transitions in the rates of fuel consumption are observed depending on fuel with the emergence of a negative-temperature-coefficient regime. For all fuels, the temperature for the transition into the high-temperature chemistry is lowered as a consequence of the plasma being able to increase the rate of fuel consumption. Using a phenomenological interpretation of the intermediate species formed, it can be shown that the active particles produced from the plasma enhance alkyl radical formation at all temperatures and enable low-temperature chain branching for fuels C 3 and greater. The significance of this result demonstrates that the plasma provides an opportunity for low-temperature chain branching to occur at reduced pressures, which is typically observed at elevated pressures in thermal induced systems.

Activation of the low-temperature non-equilibrium plasma water

2015 ◽  
pp. 359-361
Author(s):  
Michail Bruyako ◽  
Larisa Grigorieva ◽  
Angela Orlova ◽  
Vyacheslav Pevgov
Keyword(s):  
Low Temperature ◽  
Equilibrium Plasma ◽  
Non Equilibrium

Plasma Control of Boundary Layer Using Low-Temperature Non-equilibrium Plasma of Gas Discharge

2005 ◽  
Author(s):  
D Opaits ◽  
D Roupassov ◽  
Svetlana Starikovskaia ◽  
Andrei Starikovskii ◽  
Ivan Zavialov ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Low Temperature ◽  
Gas Discharge ◽  
Equilibrium Plasma ◽  
Non Equilibrium ◽  
Plasma Control

CFD Modeling of Low Temperature Ignition Processes From a Nanosecond Pulsed Discharge at Quiescent Conditions

2021 ◽  
Author(s):  
Vyaas Gururajan ◽  
Riccardo Scarcelli ◽  
Sayan Biswas ◽  
Isaac Ekoto
Keyword(s):  
Low Temperature ◽  
First Principles ◽  
Numerical Approach ◽  
Cfd Modeling ◽  
Reacting Flow ◽  
Temperature Plasma ◽  
Flow Solver ◽  
Detailed Chemistry ◽  
Equilibrium Plasma ◽  
Non Equilibrium

Abstract Recent interest in non-equilibrium plasma discharges as sources of ignition for the automotive industry has not yet been accompanied by the availability of dedicated models to perform this task in computational fluid dynamics (CFD) engine simulations. The need for a low-temperature plasma (LTP) ignition model has motivated much work in simulating these discharges from first principles. Most ignition models assume that an equilibrium plasma comprises the bulk of discharge kernels. LTP discharges, however, exhibit highly non-equilibrium behavior. In this work, a method to determine a consistent initialization of LTP discharge kernels for use in engine CFD codes like CONVERGE is proposed. The method utilizes first principles discharge simulations. Such an LTP kernel is introduced in a flammable mixture of air and fuel, and the subsequent plasma expansion and ignition simulation is carried out using a reacting flow solver with detailed chemistry. The proposed numerical approach is shown to produce results that agree with experimental observations regarding the ignitability of methane-air and ethylene-air mixtures by LTP discharges.

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