Passive acoustic diagnostics of an atmospheric pressure linear field jet including analysis in the time-frequency domain

This study presents the results of passive acoustic diagnostics of an atmospheric pressure linear field jet source operating inflowing helium. Variations of the electrical, optical and acoustic parameters of the source are monitored with respect to changing gas flow rate [0.5–7 liters per minute (lpm)] and applied voltage amplitude (3.5–7 kV). It was found that the jet length and coupled power were maximized when the jet flow was laminar. Flow mode transitions (buoyant, laminar and turbulent) associated with the jet Richardson number could easily be distinguished acoustically through their unique wavelet scalograms. Each scalogram can also be explained through qualitative correlation with the discharge electrical parameters. As the jet became turbulent, low frequency oscillation (c. 180 Hz) bursts were present in the time-frequency trace which were compared to an empirical relation for the Richardson number in the case of flow induced oscillations. It was found that the frequency value correlated well wit...

[1]  Y. Pu,et al.  Effects of gas flow rate on the length of atmospheric pressure nonequilibrium plasma jets , 2009 .

[2]  Baki M. Cetegen,et al.  Experiments on the oscillatory behavior of buoyant plumes of helium and helium‐air mixtures , 1996 .

[3]  Paul S. Addison,et al.  The Illustrated Wavelet Transform Handbook , 2002 .

[4]  George R. Cooper,et al.  Continuous and discrete signal and system analysis , 1984 .

[5]  S. Daniels,et al.  Handheld Flyback driven coaxial dielectric barrier discharge: Development and characterization. , 2008, The Review of scientific instruments.

[6]  R. Satti,et al.  Flow structure in the near-field of buoyant low-density gas jets , 2006 .

[7]  Ajay K. Agrawal,et al.  Full-field measurements of self-excited oscillations in momentum-dominated helium jets , 2005 .

[8]  M. Keidar,et al.  Temporal behavior of cold atmospheric plasma jet , 2009 .

[9]  A. Fridman,et al.  Plasma Physics and Engineering , 2021 .

[10]  Xi-Wei Hu,et al.  An 11 cm long atmospheric pressure cold plasma plume for applications of plasma medicine , 2008 .

[11]  M. Koklu,et al.  Correlation between helium mole fraction and plasma bullet propagation in low temperature plasma jets , 2010 .

[12]  Charles K. Chui,et al.  An Introduction to Wavelets , 1992 .

[13]  Xinpei Lu,et al.  Experimental investigations on the propagation of the plasma jet in the open air , 2010 .

[14]  Denis P. Dowling,et al.  Comparison of pilot and industrial scale atmospheric pressure glow discharge systems including a novel electro-acoustic technique for process monitoring , 2010 .

[15]  Zhonghe Jiang,et al.  Propagation of an atmospheric pressure plasma plume , 2009, 2009 IEEE International Conference on Plasma Science - Abstracts.

[16]  Nikita Bibinov,et al.  On the influence of metastable reactions on rotational temperatures in dielectric barrier discharges in He-N2 mixtures , 2001 .

[17]  Wei Zheng,et al.  Temporal-spatial-resolved spectroscopic study on the formation of an atmospheric pressure microplasma jet , 2008 .

[18]  U. Kogelschatz.  Dielectric-Barrier Discharges: Their History, Discharge Physics, and Industrial Applications , 2003 .

[19]  Xinpei Lu,et al.  Length control of He atmospheric plasma jet plumes: Effects of discharge parameters and ambient air , 2009 .

[20]  Xi-Ming Zhu,et al.  Role of metastable atoms in the propagation of atmospheric pressure dielectric barrier discharge jets , 2010 .

[21]  Fumio Inada,et al.  Flow Induced Vibrations : Classifications and Lessons from Practical Experiences , 2008 .

[22]  J. Walsh,et al.  Contrasting characteristics of linear-field and cross-field atmospheric plasma jets , 2008 .

[23]  Yi-Kang Pu,et al.  Characteristics of atmospheric pressure plasma jets emerging into ambient air and helium , 2009 .

[24]  M. Laroussi,et al.  Experimental investigations of plasma bullets , 2009 .

[25]  Jaeyoung Park,et al.  The atmospheric-pressure plasma jet: a review and comparison to other plasma sources , 1998 .

[26]  Xinpei Lu,et al.  Optical and electrical diagnostics of an atmospheric pressure room-temperature plasma plume , 2010 .