Characterization of Self-Induced oscillating flows by means of optical and sensor measurement methods

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F25%3A00617399" target="_blank" >RIV/68145535:_____/25:00617399 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.measurement.2025.116973" target="_blank" >https://doi.org/10.1016/j.measurement.2025.116973</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.measurement.2025.116973" target="_blank" >10.1016/j.measurement.2025.116973</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Characterization of Self-Induced oscillating flows by means of optical and sensor measurement methods

Popis výsledku v původním jazyce

This paper shows the application of different optical and sensor-based measurement methods to characterize self-induced oscillating flows inside and outside a feedback-free fluidic oscillator. The input pressures considered for the investigation range from 1.0 MPa to 5.0 MPa. Synchronized diagnostic sensors, flow visualisation and flow monitoring were set up to simultaneously acquire a complete description of the oscillator system. Two versions of the fluidic oscillator for the internal visualisation (with internal visual access window) and direct monitoring (with two sensors embedded in the chamber) of oscillating flows were numerically modelled, manufactured and tested. The flow oscillations generation and dynamic activity of vortices inside the oscillator were experimentally and numerically visualised and analysed. The flow fluctuations inside the oscillator were directly measured and the frequency spectra was calculated. The study of the propagation of the sweeping flow out of the oscillator was then tackled by front-light flow illumination and image cross-correlation techniques were used to retrieve the velocity vector field. The dynamic mode decomposition technique was applied to the measured velocity flow field to capture the oscillating flows mode structures and time dynamics. This technique allowed also the computation of the outflow dominant oscillation frequencies, which were compared with results obtained using point monitor frequency calculation and impact pressure measurement techniques. The visualisation and measurements agreed qualitatively and quantitatively with the computational fluid dynamics simulations in all the studied cases. Details of the study are discussed in the paper.

Název v anglickém jazyce

Characterization of Self-Induced oscillating flows by means of optical and sensor measurement methods

Popis výsledku anglicky

This paper shows the application of different optical and sensor-based measurement methods to characterize self-induced oscillating flows inside and outside a feedback-free fluidic oscillator. The input pressures considered for the investigation range from 1.0 MPa to 5.0 MPa. Synchronized diagnostic sensors, flow visualisation and flow monitoring were set up to simultaneously acquire a complete description of the oscillator system. Two versions of the fluidic oscillator for the internal visualisation (with internal visual access window) and direct monitoring (with two sensors embedded in the chamber) of oscillating flows were numerically modelled, manufactured and tested. The flow oscillations generation and dynamic activity of vortices inside the oscillator were experimentally and numerically visualised and analysed. The flow fluctuations inside the oscillator were directly measured and the frequency spectra was calculated. The study of the propagation of the sweeping flow out of the oscillator was then tackled by front-light flow illumination and image cross-correlation techniques were used to retrieve the velocity vector field. The dynamic mode decomposition technique was applied to the measured velocity flow field to capture the oscillating flows mode structures and time dynamics. This technique allowed also the computation of the outflow dominant oscillation frequencies, which were compared with results obtained using point monitor frequency calculation and impact pressure measurement techniques. The visualisation and measurements agreed qualitatively and quantitatively with the computational fluid dynamics simulations in all the studied cases. Details of the study are discussed in the paper.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/GA23-05235S" target="_blank" >GA23-05235S: Studium mechanismu vzniku stabilních vysokofrekvenčních kmitů generovaných v kapalině za vysokých tlaků</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Measurement

ISSN

0263-2241

e-ISSN

1873-412X

Svazek periodika

249

Číslo periodika v rámci svazku

May 2025

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

23

Strana od-do

116973

Kód UT WoS článku

001428363200001

EID výsledku v databázi Scopus

2-s2.0-85217642578