Jet flow issuing from an axisymmetric pipe-cavity-orifice nozzle
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F16%3A00473462" target="_blank" >RIV/61388998:_____/16:00473462 - 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>
Alternative languages
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 ∼ 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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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JU - Aeronautics, aerodynamics, aeroplanes
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GA14-08888S" target="_blank" >GA14-08888S: Control of flow fields by means of fluid oscillation</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
EPJ Web of Conferences
ISSN
2101-6275
e-ISSN
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Volume of the periodical
114
Issue of the periodical within the volume
March
Country of publishing house
FR - FRANCE
Number of pages
10
Pages from-to
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UT code for WoS article
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EID of the result in the Scopus database
2-s2.0-84974815595