Comparison of PIV and hot-wire statistics of turbulent boundary layer

0437650 - ÚT 2015 RIV GB eng C - Konferenční příspěvek (zahraniční konf.)
Drózdz, A. - Uruba, Václav
Comparison of PIV and hot-wire statistics of turbulent boundary layer.
Journal of Physics: Conference Series. Vol. 1. Bristol: Institute of Physics Publishing, 2014, s. 012044-012044. 530. ISSN 1742-6588.
[Fluid Mechanics Conference : FMC 2014 /21./. Krakov (PL), 15.06.2014-18.06.2014]
Grant CEP: GA ČR GAP101/10/1230; GA MŠMT 7AMB13PL003
Institucionální podpora: RVO:61388998
Klíčová slova: turbulent boundary layer * PIV * hot wire
Kód oboru RIV: BK - Mechanika tekutin

The paper shows a cross checking of turbulent boundary layer measurements using large field of view PIV and hot-wire anemometry techniques. The time-resolved PIV method was used for the experiments. The measuring plane was oriented perpendicularly to the wall and parallel to the mean flow. Hot wire measurement has been performed using the special probe with perpendicular hot wire. The HW point measurements were performed in the same place as PIV experiments. The hot-wire probe has the wire length of l+ < 20 in considered range of Reynolds numbers. Various evaluation methods were applied on PIV data. The profiles of statistical characteristics of streamwise velocity components were evaluated from the data. Mean values, standard deviations as well as skewness and kurtosis coefficients were compared for a few values of Reθ. Reynolds number ranges from 1000 to 5500. The result shows that with the increasing Reynolds number the attenuation of fluctuations maximum in PIV measurements occurs with respect to Hot-Wire measurements, however representation of velocity fluctuations using the PIV method is satisfactory. The influence of wall-normal fluctuation component on Hot-Wire near wall peak was also investigated.
Trvalý link: http://hdl.handle.net/11104/0241195