Experimental investigation on active control of flow around a finite-length square cylinder using dual synthetic jet

Active control of flow over a cylinder at Re=1800, based on the free-stream velocity U∞=0.67m/s, and cylinder diameter d=40mm, is carried out using a synthetic jet. The slot injectors are positioned at θinj = ± 70°. An actuator was used to produce a synthetic jet by exciting a cavity with an alternative piston system. The results show that for the frequency of control located around the natural frequency of the vortex emission a phenomenon of lock-in appear.

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Active control of flow over a rounded ramp by means of single and double adjacent rectangular synthetic jet actuators

Computers & Fluids ◽

10.1016/j.compfluid.2019.06.010 ◽

2019 ◽

Vol 190 ◽

pp. 98-113 ◽

Cited By ~ 4

Author(s):

E. Asgari ◽

M. Tadjfar

Keyword(s):

Active Control ◽

Synthetic Jet ◽

Synthetic Jet Actuators ◽

Jet Actuators ◽

Control Of Flow

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Experimental investigation of an active control casing treatment of centrifugal compressors

Experimental Thermal and Fluid Science ◽

10.1016/j.expthermflusci.2016.12.013 ◽

2017 ◽

Vol 83 ◽

pp. 107-117 ◽

Cited By ~ 4

Author(s):

Qichao Yang ◽

Liansheng Li ◽

Yuanyang Zhao ◽

Jun Xiao ◽

Yue Shu ◽

...

Keyword(s):

Experimental Investigation ◽

Active Control ◽

Centrifugal Compressors ◽

Casing Treatment

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Experimental investigation of a synthetic jet impinging on a fixed wall

Experiments in Fluids ◽

10.1007/s00348-013-1512-8 ◽

2013 ◽

Vol 54 (5) ◽

Cited By ~ 25

Author(s):

Yang Xu ◽

Li-Hao Feng ◽

Jin-Jun Wang

Keyword(s):

Experimental Investigation ◽

Synthetic Jet

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

Actuators ◽

10.3390/act10080185 ◽

2021 ◽

Vol 10 (8) ◽

pp. 185

Author(s):

Zuzana Antošová ◽

Zdeněk Trávníček

Keyword(s):

Reynolds Number ◽

Active Control ◽

Flow Regimes ◽

Velocity Profiles ◽

Synthetic Jet ◽

Transition To Turbulence ◽

Jet Flows ◽

Maximal Effect ◽

Hot Wire ◽

Round Jet

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.

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