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Journal of Flow Visualization and Image Processing

Published 4 issues per year

ISSN Print: 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

HELICOPTER ROTOR WAKE: STROBED LASER-SHEET VISUALIZATION

Volume 24, Issue 1-4, 2017, pp. 53-74
DOI: 10.1615/JFlowVisImageProc.v24.i1-4.50
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ABSTRACT

The individual wakes trailing behind each blade of a helicopter rotor form turbulent vortex sheets that quickly roll into concentrated tip vortex filaments. A phase-locked, strobed laser light-sheet illuminating a seeded flow has been shown to provide both a quantitative and qualitative method to study the evolution of this turbulent wake. The tip vortex cores can be identified by a well-defined seed void. The shear layer produced by the blade wake appears as a line of discontinuity in the streaklines. Because the vortex core is a rolled-up portion of the original trailed wake, the vortex core and the vortex sheet were studied as interdependent flow structures. Some outboard portions of the vortex sheet were found to descend axially through the flow at a greater rate than the tip vortex core. While maintaining some connection to the original vortex core, the vortex sheet interacts with the tip vortex trailed from another blade. During the interaction, three-component laser Doppler velocimetry (LDV) measurements show a substantial increase in the angular velocity of the fluid within the vortex core. A three-dimensional reconstruction of the wake geometry in terms of the core trajectories agrees with results measured by LDV.

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