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Journal of Flow Visualization and Image Processing

Erscheint 4 Ausgaben pro Jahr

ISSN Druckformat: 1065-3090

ISSN Online: 1940-4336

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.6 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.6 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00013 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.14 SJR: 0.201 SNIP: 0.313 CiteScore™:: 1.2 H-Index: 13

Indexed in

A VISUALIZATION STUDY OF TIP VORTEX ROLL-UP OF AN OSCILLATING WING

Volumen 6, Ausgabe 1, 1999, pp. 79-87
DOI: 10.1615/JFlowVisImageProc.v6.i1.70
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ABSTRAKT

A flow visualization study was made to examine qualitatively the unsteady wing-tip vortex roll-up of an oscillating wing. A rectangular wing of aspect ratio 4 with NACA 0012 airfoil cross-section was mounted on one side of the wind tunnel wall, and the wing was pitched sinusoidally about the quarter chord. Both the mean incidence and the amplitude of oscillation were set at 15°. The reduced frequency of the oscillation was 0.09. Visualized flow patterns both in streamwise and in cross-sectional planes with smoke wire and light sheet arrangement are presented. The vortical flow pattern at various angles of attack clearly demonstrates the periodic vortex roll-up behavior. When the wing is in pitch-up motion, the flow remains attached to the wing, whereas the flow becomes separated during the pitch-down motion. The visualized vortex cores during the pitch-up motion are thus well defined and regular. On the contrary, the vortex cores during the pitch-down motion are of irregular shape, reflecting the roll-up from the separated flow. With reference to the tip-vortex strength (i.e., the circulation) data, the size of the visualized vortex core is seen to increase with the strength of the vortex for both pitch-up and pitch-down cases.

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