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Computer-aided visualization analysis of flow kinematics behind pulsating adaptive airfoilŠirok, Brane ...ǂAn ǂexperimental study of flow kinematics along and behind a hollow NACA 4416 adaptive airfoil at Reynolds number Re = 1016 was performed in a fully-developed airflow of a non-return subsonic wind ... tunnel using flow visualization and a digital image-processing method. The airfoil shape was modified with periodic pressure changes inside the airfoil. On geometrically calibrated airfoil measurements of airflow kinematics were performed at stationary integral parameters, and periodic time-pulsating airfoil deformations. A CCD camera was used to capture smoke visualization images of the turbulent airflow wake illuminated by the light sheet. A quantitative analysis was made on time series, obtained by simultaneous digitization of the grey level in several small areas (windows) of the overall image. The flow field along and behind the airfoil exhibited various frequency spectra and standard deviations. With aid of the computer-aided visualization method structural flow changes were investigated, i.e. variations of a wake frequency response and respective amplitudes in dependence on airfoil pulsation frequency. Results show that periodical changes of the airfoil shape affect on a flow structure along and behind the airfoil, i.e. amplitude and frequency of the wake, and location of a separation point, as well. There may exist possibilities of adaptive flow kinematics variation along and behind the airfoil.Source: FLUCOME 2000 [Računalniška datoteka] : proceedings (Fl_093.pdf (6 str.))Type of material - conference contributionPublish date - 2000Language - englishCOBISS.SI-ID - 3970587
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Širok, Brane | 09286 |
Novak, Matej, 1968- | 15977 |
Hočevar, Marko, strojnik, 1972- | 18836 |
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