Aeroelastic instability of differently porous U-profiles in crosswind direction

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F22%3A00557017" target="_blank" >RIV/68378297:_____/22:00557017 - isvavai.cz</a>
Result on the web
<a href="https://www.engmech.cz/im/proceedings/show_p/2022/153" target="_blank" >https://www.engmech.cz/im/proceedings/show_p/2022/153</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.21495/51-2-153" target="_blank" >10.21495/51-2-153</a>

Result language
angličtina
Original language name
Aeroelastic instability of differently porous U-profiles in crosswind direction
Original language description
Flow-induced vibrations of the flexibly mounted slender U-shaped beams allowed to oscillate in the crosswind direction only are studied experimentally in the wind tunnel. All beams are characterized by a cross section having a side ratio of along-wind to across-wind dimension equal to two. The effects of two depths of U profiles and two porosities of their flanges ( 0 % and 75 %) onto a loss of aeroelastic stability are investigated under the smooth flow conditions and for low Scruton numbers. The results indicate almost similar proneness of the non-porous beams to galloping-type oscillations to a rectangular prism with the same side ratio regardless their depth. The onset of across-wind galloping occurred in these cases at wind velocity very close to von-Kármán-vortex-resonance flow speed, even though the critical velocity predicted by the quasisteady theory is much lower. For porous and shallower U profile this asynchronous quenching also takesnplace. However, the higher flange porosity reduces significantly not only the vortex-shedding effect, but also causes an increase in the onset galloping velocity above the critical speed determined for non-porous profiles. In the case of deeper U-shaped beam, the effect of higher porosity even suppresses the proneness to galloping
Czech name
—
Czech description
—

Project
<a href="/en/project/GA19-21817S" target="_blank" >GA19-21817S: Nonholonomic interaction and dynamical stability of aeroelastic systems</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Engineering mechanics 2022. Book of full texts
ISBN
978-80-86246-48-2
ISSN
1805-8248
e-ISSN
1805-8256
Number of pages
4
Pages from-to
153-156
Publisher name
Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences
Place of publication
Prague
Event location
Milovy
Event date
May 9, 2022
Type of event by nationality
EUR - Evropská akce
UT code for WoS article
—

Similar results(10)