Influence of Geometry on a Feedback-Free Fluidic Oscillator with Nonoutlet Facing Jets

AIAA Journal ◽  
2018 ◽  
Vol 56 (12) ◽  
pp. 4768-4774
Author(s):  
Frieder Reichenzer ◽  
Mike Schneider ◽  
Stefan Dörr
Keyword(s):  
Fluidic Oscillator

scholarly journals Computational Fluidic Modeling of a Low‐Cost Fluidic Oscillator for Conversion of a CPAP Machine into an Emergency Use Mechanical Ventilator

2021 ◽  
pp. 2000112
Author(s):  
Tom Dillon ◽  
Caglar Ozturk ◽  
Keegan Mendez ◽  
Luca Rosalia ◽  
Samuel Dutra Gollob ◽  
...  
Keyword(s):  
Low Cost ◽  
Mechanical Ventilator ◽  
Fluidic Oscillator

The Time-Resolved Internal and External Flow Field Properties of a Fluidic Oscillator

2014 ◽  
Author(s):  
Sarah Gaertlein ◽  
Rene Woszidlo ◽  
Florian Ostermann ◽  
C. Nayeri ◽  
Christian O. Paschereit
Keyword(s):  
Flow Field ◽  
External Flow ◽  
Time Resolved ◽  
Fluidic Oscillator

Fluidic-oscillator flowmeter-gradiometer RPS

1996 ◽  
Vol 39 (2) ◽  
pp. 173-175
Author(s):  
P. A. Aristov ◽  
G. V. Belousov ◽  
V. S. Evsyutkin ◽  
V. A. Khlyst ◽  
A. M. Kipnis
Keyword(s):  
Fluidic Oscillator

Evolution and Turbulence Properties of Self-Sustained Transversely Oscillating Flow Induced by Fluidic Oscillator

2007 ◽  
Vol 129 (8) ◽  
pp. 1038-1047 ◽  
Author(s):  
Rong Fung Huang ◽  
Kuo Tong Chang
Keyword(s):  
Stagnation Point ◽  
Vortex Pair ◽  
Transverse Oscillation ◽  
Oscillating Flow ◽  
Near Wake ◽  
Fluidic Oscillator ◽  
Planar Jet ◽  
Oscillation Process ◽  
Gravity Driven ◽  
Flow Evolution

The evolution process and turbulence properties of a transversely oscillating flow induced by a fluidic oscillator are studied in a gravity-driven water tunnel. A planar jet is guided to impinge a specially designed crescent surface of a target blockage that is enclosed in a cavity of a fluidic oscillator. The geometric configuration of the cavity transforms the inherent stability characteristics of the jet from convective instability to absolute instability, so that the jet precedes the persistent back and forth swinging in the cavity. The swinging jet is subsequently directed through two passages and issued alternatively out of the fluidic oscillator. Two short plates are installed near the exits of the alternatively issuing pulsatile jets to deflect the jets toward the central axis. The deflected jets impinge with each other and form a pair of counter-rotating vortices in the near wake of the oscillator with a stagnation point at the impingement point. The stagnation point of the counter-rotating vortex pair moves back and forth transversely because of the phase difference existing between the two issued jets. The merged flow evolving from the counter-rotating vortices formed by the impingement of the two pulsatile jets therefore presents complex behavior of transverse oscillation. The topological models corresponding to the flow evolution are constructed to illustrate the oscillation process of the oscillating flow. Significant momentum dispersion and large turbulence intensity are induced by the transverse oscillation of the merged flow. The statistical turbulence properties show that the Lagrangian integral time and length scales of the turbulence eddies (the fine-scale structure) produced in the oscillating flow are drastically reduced.

scholarly journals NUMERICAL MODELLING OF OSCILLATING FLOW FOR ENERGY HARVESTING

2021 ◽  
Vol 2021 (6) ◽  
pp. 5360-5365
Author(s):  
TOMAS BLEJCHAR ◽  
◽  
SYLVA DRABKOVA ◽  
VACLAV JANUS ◽  
◽  
...  
Keyword(s):  
Flow Rate ◽  
Volume Flow Rate ◽  
Electrical Energy ◽  
Maximum Energy ◽  
Oscillating Flow ◽  
Cfd Simulations ◽  
Fluidic Oscillator ◽  
Microelectronic Devices ◽  
Piezoelectric Elements ◽  
New Generation

The energy efficiency of systems, equipment, and sensors is nowadays intensively studied. The new generation of microelectronic sensors is very sophisticated and the energy consumption is in the microwatts range. The energy to power the microelectronic devices can be harvested from oscillating flow in small size channels and so replaceable batteries could be eliminated. Piezoelectric elements can convert energy from oscillation to electrical energy. This paper focuses on the simulation of periodic flow in the fluidic oscillator. CFD simulations were performed for several values of the flow rate. Experimental measurement was carried out under the same conditions as the CFD experiment. The main monitored and evaluated parameters were volume flow rate and pressure loss. Fluid oscillations were analysed based on CFD simulations and the theoretical maximum energy available for the deformation of piezoelectric elements and transformable into electrical energy was evaluated.

Modal Analysis of a Sweeping Jet Emitted by a Fluidic Oscillator

2021 ◽  
Author(s):  
Daniel J. Portillo ◽  
Eugene N. Hoffman ◽  
Matt Garcia ◽  
Elijah LaLonde ◽  
Emilio Hernandez ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Fluidic Oscillator

Interaction between a Jet emitted by a Fluidic Oscillator and a Crossflow at a Skew Angle

2019 ◽  
Author(s):  
Florian Ostermann ◽  
Rene Woszidlo ◽  
Christian Nayeri ◽  
Christian O. Paschereit
Keyword(s):  
Skew Angle ◽  
Fluidic Oscillator
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