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• W4386595001 abstract "Abstract We study the effect of an inhomogeneous gas density on positive streamer discharges in air using a 3D fluid model with stochastic photoionization, generalizing earlier work with a 2D axisymmetric model by Starikovskiy and Aleksandrov (2019 Plasma Sources Sci. Technol. 28 095022). We consider various types of planar and (hemi)spherical gas density gradients. Streamers propagate from a region of density <?CDATA $n_mathrm{0}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi>n</mml:mi> <mml:mrow> <mml:mn>0</mml:mn> </mml:mrow> </mml:msub> </mml:math> towards a region of higher or lower gas density <?CDATA $n_mathrm{1}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi>n</mml:mi> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> </mml:msub> </mml:math> , where <?CDATA $n_mathrm{0}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi>n</mml:mi> <mml:mrow> <mml:mn>0</mml:mn> </mml:mrow> </mml:msub> </mml:math> corresponds to <?CDATA $300,mathrm{K}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mn>300</mml:mn> <mml:mrow> <mml:mi mathvariant=normal>K</mml:mi> </mml:mrow> </mml:math> and <?CDATA $1,mathrm{bar}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mn>1</mml:mn> <mml:mrow> <mml:mi mathvariant=normal>b</mml:mi> <mml:mi mathvariant=normal>a</mml:mi> <mml:mi mathvariant=normal>r</mml:mi> </mml:mrow> </mml:math> . We observe that streamers can always propagate into a region with a lower gas density. When streamers enter a region with a higher gas density, branching can occur at the density gradient, with branches growing in a flower-like pattern over the gradient surface. Depending on the gas density ratio, the gradient width and other factors, narrow branches are able to propagate into the higher-density gas. In a planar geometry, we find that such propagation is possible up to a gas density slope of <?CDATA $3.5,n_mathrm{0}/mathrm{mm}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mn>3.5</mml:mn> <mml:msub> <mml:mi>n</mml:mi> <mml:mrow> <mml:mn>0</mml:mn> </mml:mrow> </mml:msub> <mml:mrow> <mml:mo>/</mml:mo> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>m</mml:mi> <mml:mi mathvariant=normal>m</mml:mi> </mml:mrow> </mml:math> , although this value depends on a number of conditions, such as the gradient angle. Surprisingly, a higher applied voltage makes it more difficult for streamers to penetrate into the high-density region, due to an increase of the primary streamer’s radius." @default.
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• W4386595001 date "2023-09-01" @default.
• W4386595001 modified "2023-09-27" @default.
• W4386595001 title "3D modeling of positive streamers in air with inhomogeneous density" @default.
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• W4386595001 doi "https://doi.org/10.1088/1361-6595/acf87d" @default.
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