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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Druckformat: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v1.i3.40
pages 189-209

A LASER-BASED, COMPUTER-AIDED, NONINTRUSIVE TECHNIQUE FOR QUALITATIVE AND QUANTITATIVE FLOW CHARACTERIZATION IN COWL-LIP CONFIGURATIONS OF VARIABLE GEOMETRY

Minel J. Braun
Department of Mechanical Engineering, University of Akron, Akron, OH 44325
V. A. Canacci
Department of Mechanical Engineering, University of Akron, Akron, Ohio 44325
L. M. Russell
NASA-Lewis Research Center, Cleveland, Ohio 44135

ABSTRAKT

This article has a twofold thrust: (1) The first is to present an application of a laser-based, computer-aided image processing technique for the full-field nonintrusive qualitative and quantitative evaluation of flow trajectories and velocities in a fluid; (2) the second is to apply this technique to the flow in a curved channel with a 180° turn, characteristic of inlet passages of the cowls of air-breathing aircraft engines. The method, based on the illumination of the test section with a planar laser sheet of light, allows microscopic or macroscopic surveillance of fluid flow across or along relatively large cross sections. The light-reflecting fluid tracers are tracked for relatively long (>1 s) periods of time. The procedure is Lagrangian in concept, and permits the identification and tracking of the same particle, thus facilitating construction of time-dependent trajectories, and calculation of time-dependent, rather than instantaneous, velocities and accelerations. The velocity maps can be used for construction of empirical heat transfer correlations as well as for verification of computer codes that predict the heat transfer rates in cowl geometries.


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