Jet flow issuing from an axisymmetric pipe-cavity-orifice nozzle

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F16%3A00329565" target="_blank" >RIV/68407700:21220/16:00329565 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1051/epjconf/201611402006" target="_blank" >http://dx.doi.org/10.1051/epjconf/201611402006</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/epjconf/201611402006" target="_blank" >10.1051/epjconf/201611402006</a>

Result language

angličtina

Original language name

Jet flow issuing from an axisymmetric pipe-cavity-orifice nozzle

Original language description

An axisymmetric air jet flow is experimentally investigated under passive flow control. The jet issues from a pipe of the inner diameter and length of 10 mm and 150 mm which is equipped with an axisymmetric cavity at the pipe end. The cavity operates as a resonator creating self-sustained acoustic excitations of the jet flow. A mechanism of excitations is rather complex - in comparison with a common Helmholtz resonator. The experiments were performed using flow visualization, microphone measurements and time-mean velocity measurements by the Pitot probe. The power spectral density (PSD) and the sound pressure level (SPL) were evaluated from microphone measurements. The jet Reynolds number ranged Re = 1600-18 000. Distinguishable peaks in PSD indicated a function of the resonator. Because the most effective acoustic response was found at higher Re, a majority of experiments focused on higher Re regime. The results demonstrate effects of the passive control on the jet behavior. Fluid mixing and velocity decay along the axis is intensified. It causes shortening of the jet transition region. On the other hand, an inverse proportionality of the velocity decay (u similar to 1/x) in the fully developed region is not changed. The momentum and kinetic energy fluxes decrease more intensively in the controlled jets in comparison with common jets.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

20302 - Applied mechanics

Project

<a href="/en/project/GA14-08888S" target="_blank" >GA14-08888S: Control of flow fields by means of fluid oscillation</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

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

Article name in the collection

EFM15 - Experimental Fluid Mechanics 2015

ISBN

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ISSN

2100-014X

e-ISSN

2100-014X

Number of pages

10

Pages from-to

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Publisher name

EDP Sciences

Place of publication

Les Ulis Cedex A

Event location

Praha

Event date

Nov 17, 2015

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000400395300008