Publication:
Effects of ambient turbulence and stratification on the demise of trailing vortices

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Authors
Sarpkaya, Turgut
Daly, John J.
Subjects
Trailing Vortices
Ambient Turbulence
Vortex Decay
Stratification
Advisors
Date of Issue
1986-07-11
Date
July 1985 - July 1986
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
A series of experiments was carried out with two streamlined foils at two different speeds in a towing tank. The ambient turbulence (nearly isotropic) was generated by means of a biplanar grid. The model-grid separation distance was varied systematically in order to subject the trailing vortices to varying degrees of turbulence. The data have been expressed in terms of a normalized turbulence parameter and the relative rise of the vortices. The results have shown that the ultimate height to which the vortices rise prior to their demise is controlled by the two parameters cited, irrespective of the shape and the aspect ratio of the lifting surfaces. A numerical analysis has been initiated to analyze the motion of the trailing vortices and the propagation of internal waves in density stratified medium with the ultimate objective of incorporating the effect of turbulence into the numerical model.
Type
Technical Report
Description
Series/Report No
Department
Identifiers
NPS Report Number
NPS-69-86-006
Sponsors
Prepared for: Defense Advanced Research Projects Agency
Funder
supported by Defense Advanced Research Projects Agency (DARPA) through ARPA Order 3925
Format
NA
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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