Localized shear-layer disturbances affected by laminar flow separation

M. M. Katasonov, A. M. Pavlenko, V. V. Kozlov, A. V. Dovgal

Результат исследования: Публикации в книгах, отчётах, сборниках, трудах конференцийстатья в сборнике материалов конференциинаучнаярецензирование

Аннотация

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.

Язык оригиналаанглийский
Название основной публикации19th International Conference on the Methods of Aerophysical Research, ICMAR 2018
РедакторыVasily Fomin
ИздательAmerican Institute of Physics Inc.
Число страниц6
ISBN (электронное издание)9780735417472
DOI
СостояниеОпубликовано - 2 ноя 2018
Опубликовано для внешнего пользованияДа
Событие19th International Conference on the Methods of Aerophysical Research, ICMAR 2018 - Akademgorodok, Novosibirsk, Российская Федерация
Продолжительность: 13 авг 201819 авг 2018

Серия публикаций

НазваниеAIP Conference Proceedings
Том2027
ISSN (печатное издание)0094-243X
ISSN (электронное издание)1551-7616

Конференция

Конференция19th International Conference on the Methods of Aerophysical Research, ICMAR 2018
СтранаРоссийская Федерация
ГородAkademgorodok, Novosibirsk
Период13.08.201819.08.2018

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