Sinha, Aniruddha and Alkandry, Hind and Kearney-Fischer, Martin and Samimy, Mo and Colonius, Tim (2012) The impulse response of a high-speed jet forced with localized arc filament plasma actuators. Physics of Fluids, 24 (12). Art. No. 125104. ISSN 1070-6631 http://resolver.caltech.edu/CaltechAUTHORS:20130201-102028177
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We present experimental and theoretical analyses of the response of high-speed, high-Reynolds-number, round jets to impulsive forcing with arc-filament-plasma actuators. The impulse response is obtained with forcing Strouhal numbers, based on the nozzle exit diameter and exit center line velocity, less than 0.1. The resulting phase-averaged near-field pressure signature displays a compact wave with a positive peak preceding a negative one, indicative of a large scale structure in the shear layer of the jet. Scaling laws derived by operating the jet at four subsonic Mach numbers are used to distinguish this hydrodynamic component of the phase-averaged jet response from the direct actuator noise. As the forcing frequency increases, the compact waves in the near-field pressure signal overlap each other, indicating interaction of the growing seeded structures. For this regime, the phase-averaged response is approximately replicated by linear superposition of the impulse response, thereby demonstrating the quasi-linearity of structure interaction. A novel application of linear parabolized stability theory yields a successful model of the impulse response.
|Additional Information:||© 2013 American Institute of Physics. Received 16 August 2012; accepted 8 November 2012; published online 19 December 2012. The support of this research by the Air Force Office of Scientific Research with Dr. John Schmisseur is greatly appreciated. The PSE code has been developed over the years by Dr. Kristjan Gudmundsson, Dr. Arnab Samanta, Dr. Daniel Rodriguez, and the first author (Aniruddha Sinha), under the guidance of the last author (Tim Colonius) – their contributions are gratefully acknowledged. The article was improved thanks to comments and suggestions from referees.|
|Subject Keywords:||actuators; arcs (electric); confined flow; flow instability; flow visualisation; jets; Mach number; nozzles; plasma devices; shear flow; subsonic flow|
|Classification Code:||PACS: 47.60.Kz; 47.20.Ft; 47.40.Dc; 47.80.Jk; 47.60.-i|
|Official Citation:||The impulse response of a high-speed jet forced with localized arc filament plasma actuators Aniruddha Sinha, Hind Alkandry, Martin Kearney-Fischer, Mo Samimy, and Tim Colonius, Phys. Fluids 24, 125104 (2012), DOI:10.1063/1.4772191|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||01 Feb 2013 18:45|
|Last Modified:||01 Feb 2013 18:45|
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