Control of a Round Jet Intermittency and Transition to Turbulence by Means of an Annular Synthetic Jet

0544701 - ÚT 2022 RIV CH eng J - Článek v odborném periodiku
Antošová, Zuzana - Trávníček, Zdeněk
Control of a Round Jet Intermittency and Transition to Turbulence by Means of an Annular Synthetic Jet.
Actuators. Roč. 10, č. 8 (2021), č. článku 185. E-ISSN 2076-0825
Grant CEP: GA ČR(CZ) GC21-26232J
Institucionální podpora: RVO:61388998
Klíčová slova: synthetic jet * pipe flow * intermittency
Obor OECD: Aerospace engineering
Impakt faktor: 2.523, rok: 2021
Způsob publikování: Open access
https://www.mdpi.com/2076-0825/10/8/185

This paper deals with active control of a continuous jet issuing from a long pipe nozzle by means of a concentrically placed annular synthetic jet. The experiments in air cover regimes of laminar, transitional, and turbulent main jet flows (Reynolds number ranges 1082–5181). The velocity profiles (time-mean and fluctuation components) of unforced and forced jets were measured using hot-wire anemometry. Six flow regimes are distinguished, and their parameter map is proposed. The possibility of turbulence reduction by forcing in transitional jets is demonstrated, and the maximal effect is revealed at Re = 2555, where the ratio of the turbulence intensities of the forced and unforced jets is decreased up to 0.45.
Trvalý link: http://hdl.handle.net/11104/0321628