Finding of parameters of helical symmetry for unsteady vortex flow based on phase-averaged PIV measurement dataВ
I.V. Litvinov, D.K. Sharaborin, and S.I. ShtorkВ
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Novosibirsk State University, Novosibirsk, Russia
E-mail: litvinov@itp.nsc.ru
Keywords: processing vortex core, PIV, helical vortex theory
Pages: 647–650
Abstract
The phase-averaged velocity distributions were applied for calculation of parameters of a precessing vortex core; these were the input data for calculation of precession frequency by a formula derived from the helical vortex theory. It was demonstrated that the calculated frequency is within 10% error from the frequency measured in experiments. These results confirm the theory validity, and this opens opportunities for analysis of mechanisms controlling the precessing vortex core and external factors.
DOI: DOI: 10.1134/S0869864315050133
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