Spectral analysis of a synthetic jet

0359158 - ÚT 2012 RIV CH eng J - Journal Article
Tesař, Václav - Kordík, Jozef
Spectral analysis of a synthetic jet.
Sensors and Actuators A - Physical. Roč. 167, č. 2 (2011), s. 213-225. ISSN 0924-4247. E-ISSN 1873-3069
R&D Projects: GA ČR GA101/07/1499; GA AV ČR IAA200760705
Institutional research plan: CEZ:AV0Z20760514
Keywords : jet * synthetic jet * frequency spectrum
Subject RIV: BK - Fluid Dynamics
Impact factor: 1.802, year: 2011
http://www.sciencedirect.com/science/article/pii/S0924424711000628

In their earlier publications, the present authors discovered a phenomenon, previously not reported, of sudden substantial change in the character and structure of axisymmetric synthetic jets that occurs at relative axial distance ~ 50 nozzle diameters. It was suggested the change is associated with the transition from the regime dominated by coherent vortical structures into the flow dominated by stochastic turbulence. To validate this hypothesis, frequency spectra were incestigated at various locations in a synthetic jet generated in d = 4mm dia. nozzle at the forcing frequency ff = 30Hz. The results corroborate the idea. In addition, the analysis has lead to several previously not known facts about structure and character of synthetic jets.
Permanent Link: http://hdl.handle.net/11104/0196994