TY - GEN

T1 - Acoustic wave control using glow discharge plasma

AU - Soukhomlinov, Vladimir

AU - Stepaniuk, V.

AU - Tarau, C.

AU - Ötügen, V.

AU - Sheverev, V.

AU - Raman, Ganesh

PY - 2002

Y1 - 2002

N2 - The reflection of sound waves by glow discharge plasma was studied theoretically. The main thrust of the investigation was to determine the effectiveness of using glow discharge plasma as a tool in flow control applications. Plasma offers a unique possibility of flow control by remotely introducing energy into the gas medium. In can be generated in a target region of the gas using electromagnetic radiation. Recent experiments demonstrated that a plasma "sheet" attenuate a sound wave by up to 10 dB1. In the present work, sound wave reflection from the gas-plasma boundary is analyzed theoretically. Based on Euler's equations, a onedimensional equation for propagation of the sound wave through a gas with temperature gradients is derived, which was found to be identical to the classical Schroedinger's equation for propagation of the quantum particle through a potential barrier. An analytical solution for the sound reflection coefficient is obtained. The values of the reflection coefficients calculated for realistic temperature distributions in the gas-plasma boundary are encouraging and indicate that glow discharge plasma, indeed, may be a viable method for aeroacoustic control. The analytical results for the onedimensional acoustic wave propagation through plasma agree well with numerical results, which are obtained using the unsteady one-dimensional Euler's equations using a second-order accurate finite difference scheme.

AB - The reflection of sound waves by glow discharge plasma was studied theoretically. The main thrust of the investigation was to determine the effectiveness of using glow discharge plasma as a tool in flow control applications. Plasma offers a unique possibility of flow control by remotely introducing energy into the gas medium. In can be generated in a target region of the gas using electromagnetic radiation. Recent experiments demonstrated that a plasma "sheet" attenuate a sound wave by up to 10 dB1. In the present work, sound wave reflection from the gas-plasma boundary is analyzed theoretically. Based on Euler's equations, a onedimensional equation for propagation of the sound wave through a gas with temperature gradients is derived, which was found to be identical to the classical Schroedinger's equation for propagation of the quantum particle through a potential barrier. An analytical solution for the sound reflection coefficient is obtained. The values of the reflection coefficients calculated for realistic temperature distributions in the gas-plasma boundary are encouraging and indicate that glow discharge plasma, indeed, may be a viable method for aeroacoustic control. The analytical results for the onedimensional acoustic wave propagation through plasma agree well with numerical results, which are obtained using the unsteady one-dimensional Euler's equations using a second-order accurate finite difference scheme.

UR - http://www.scopus.com/inward/record.url?scp=84896857309&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84896857309

SN - 9781624101052

BT - 1st Flow Control Conference

T2 - 1st Flow Control Conference 2002

Y2 - 24 June 2002 through 26 June 2002

ER -