Результаты исследований: Публикации в книгах, отчётах, сборниках, трудах конференций › статья в сборнике материалов конференции › научная › Рецензирование
Localized shear-layer disturbances affected by laminar flow separation. / Katasonov, M. M.; Pavlenko, A. M.; Kozlov, V. V. и др.
19th International Conference on the Methods of Aerophysical Research, ICMAR 2018. ред. / Vasily Fomin. American Institute of Physics Inc., 2018. 030099 (AIP Conference Proceedings; Том 2027).Результаты исследований: Публикации в книгах, отчётах, сборниках, трудах конференций › статья в сборнике материалов конференции › научная › Рецензирование
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TY - GEN
T1 - Localized shear-layer disturbances affected by laminar flow separation
AU - Katasonov, M. M.
AU - Pavlenko, A. M.
AU - Kozlov, V. V.
AU - Dovgal, A. V.
PY - 2018/11/2
Y1 - 2018/11/2
N2 - Evolution of laminar flow localized perturbations generated in shear layers by low-frequency local vibration of the wall is investigated in a wind tunnel. The experimental data are obtained at low subsonic velocities by hot-wire measurements. A laminar boundary layer on flat plate placed parallel to the oncoming flow represents the basic examined configuration. The local surface vibration generates longitudinal velocity disturbances in the form of spatially localized quasi-stationary deformations of the near-wall flow region. According to recent experimental data, in such conditions the high-frequency instability is stimulated at the forward and rear fronts of the longitudinal structures. Then, the basic flat-plate flow is modified by a 2D backward-facing step mounted on the plate which creates a local region of boundary-layer separation. The characteristics of velocity perturbations induced by surface vibration are compared in the attached and separated shear layers. As is found, laminar flow separation promotes the amplification of high-frequency oscillations at the fronts of streaky structures, thus, stimulating the transition to turbulence.
AB - Evolution of laminar flow localized perturbations generated in shear layers by low-frequency local vibration of the wall is investigated in a wind tunnel. The experimental data are obtained at low subsonic velocities by hot-wire measurements. A laminar boundary layer on flat plate placed parallel to the oncoming flow represents the basic examined configuration. The local surface vibration generates longitudinal velocity disturbances in the form of spatially localized quasi-stationary deformations of the near-wall flow region. According to recent experimental data, in such conditions the high-frequency instability is stimulated at the forward and rear fronts of the longitudinal structures. Then, the basic flat-plate flow is modified by a 2D backward-facing step mounted on the plate which creates a local region of boundary-layer separation. The characteristics of velocity perturbations induced by surface vibration are compared in the attached and separated shear layers. As is found, laminar flow separation promotes the amplification of high-frequency oscillations at the fronts of streaky structures, thus, stimulating the transition to turbulence.
KW - INSTABILITY
UR - http://www.scopus.com/inward/record.url?scp=85056354943&partnerID=8YFLogxK
U2 - 10.1063/1.5065193
DO - 10.1063/1.5065193
M3 - Conference contribution
AN - SCOPUS:85056354943
T3 - AIP Conference Proceedings
BT - 19th International Conference on the Methods of Aerophysical Research, ICMAR 2018
A2 - Fomin, Vasily
PB - American Institute of Physics Inc.
T2 - 19th International Conference on the Methods of Aerophysical Research, ICMAR 2018
Y2 - 13 August 2018 through 19 August 2018
ER -
ID: 25833445