TY - GEN
T1 - Sound generation and control of thermoacoustic instabilities by nanosecond plasma discharges
AU - Bölke, Olaf
AU - Moeck, Jonas P.
AU - Lacoste, Deanna
N1 - KAUST Repository Item: Exported on 2020-12-23
Acknowledgements: This work was supported by the German Research Foundation (DFG) and the Agence Nationale de la Recherche (ANR) through the DRACO project (grant numbers ANR-13-IS09-0004, MO 2551/1)
PY - 2016/1/1
Y1 - 2016/1/1
N2 - Sound generation by nanosecond repetitively pulsed plasma discharges is investigated experimentally. High voltage pulses of 10 nanosecond duration provide rapid heating of the air. A high-frequency pulse train between 20 and 30 kHz is burst modulated to generate low-frequency components. The generation of pressure waves from the modulated discharge pulse train is characterized based on acoustic measurements in an impedance tube. Different combinations of modulation frequency, electrode gap distance, modulation duty cycle and pulse repetition frequency are studied in terms of electric energy and acoustic source amplitude. The measurement results suggest that overall, the amplitude of the pressure wave components at the modulation frequency can be well estimated based on the electrical power using an analytical expression for acoustically compact unsteady heating. As an application of sound generation by low-frequency modulated NRP discharges, feedback control is applied to suppress thermoacoustic instabilities in a Rijke tube. The pressure oscillation amplitude is reduced by more than two orders of magnitude when the plasma discharges are suitably synchronized with the self-excited fluctuations.
AB - Sound generation by nanosecond repetitively pulsed plasma discharges is investigated experimentally. High voltage pulses of 10 nanosecond duration provide rapid heating of the air. A high-frequency pulse train between 20 and 30 kHz is burst modulated to generate low-frequency components. The generation of pressure waves from the modulated discharge pulse train is characterized based on acoustic measurements in an impedance tube. Different combinations of modulation frequency, electrode gap distance, modulation duty cycle and pulse repetition frequency are studied in terms of electric energy and acoustic source amplitude. The measurement results suggest that overall, the amplitude of the pressure wave components at the modulation frequency can be well estimated based on the electrical power using an analytical expression for acoustically compact unsteady heating. As an application of sound generation by low-frequency modulated NRP discharges, feedback control is applied to suppress thermoacoustic instabilities in a Rijke tube. The pressure oscillation amplitude is reduced by more than two orders of magnitude when the plasma discharges are suitably synchronized with the self-excited fluctuations.
UR - http://hdl.handle.net/10754/666601
UR - https://research.kaust.edu.sa/en/publications/sound-generation-and-control-of-thermoacoustic-instabilities-by-n
UR - http://www.scopus.com/inward/record.url?scp=84987858698&partnerID=8YFLogxK
M3 - Conference contribution
SN - 9789609922623
BT - 23rd International Congress on Sound and Vibration, ICSV 2016
PB - International Institute of Acoustics and VibrationsP O Box 13AuburnAL 36831
ER -