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Control of a Round Jet Intermittency and Transition to Turbulence by Means of an Annular Synthetic Jet
- 1.0544701 - ÚT 2022 RIV CH eng J - Journal Article
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
R&D Projects: GA ČR(CZ) GC21-26232J
Institutional support: RVO:61388998
Keywords : synthetic jet * pipe flow * intermittency
OECD category: Aerospace engineering
Impact factor: 2.523, year: 2021
Method of publishing: 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.
Permanent Link: http://hdl.handle.net/11104/0321628
Number of the records: 1