Abstract
Sustainable and low-emission combustion is in need of novel schemes to enhance combustion efficiency and control to meet up with new emission standards and comply with varying quality of renewable fuels. Plasma actuation is a promising candidate to achieve this goal but few detailed experiments have been carried out that target how specific combustion and plasma related species are affected by the coupling of plasma and combustion chemistry. Atomic hydrogen is such a species that here is imaged by using the two-photon absorption laser induced fluorescence (TALIF) technique as an atmospheric pressure methane–air flame is actuated by nanosecond repetitively pulsed (NRP) discharges. Atomic hydrogen is observed both in the flame and in the discharge channel and plasma actuation results in a wide modification of the flame shape. A local 50% increase of fluorescence occurs at the flame front where it is crossed by the discharge. Atomic hydrogen in the discharge channel in the fresh-gases is found to decay with a time constant of about 2.4 μs. These results provide new insights on the plasma flame interaction at atmospheric pressure that can be further used for cross-validation of numerical calculations.
Highlights
This paper is organized as follows: in Sec. 2, we describe our experimental apparatuses, including the burner designed for plasma-assisted experiments, the femtosecond laser system, and the two-photon absorption laser induced fluorescence (TALIF) detection setup
Compared to the case of base flame, it is obvious that glow discharges impact the spatial distribution of atomic hydrogen and the following features can be noticed: (1) the distribution of H is stretched in the vertical direction as a result of change in flame shape, corresponding to Fig. 3b. (2)
In this work 2D fs-TALIF imaging of atomic hydrogen in a lean methane-air flame crossed by nanosecond repetitively pulsed (NRP) glow discharges has been demonstrated
Summary
The objective of this paper is to demonstrate fsTALIF imaging of hydrogen in a laminar methane-air plasma-assisted flame
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