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RESEARCH PAPERS: Additional Technical Papers

LDA Measurements in Plane Turbulent Jets

[+] Author and Article Information
B. R. Ramaprian

Department of Mechanical Engineering and Iowa Institute of Hydraulic Research, University of Iowa, Iowa City, Iowa 52242

M. S. Chandrasekhara

Joint Institute for Aeronautics and Accoustics, Stanford University, Stanford, Calif. 94305

J. Fluids Eng 107(2), 264-271 (Jun 01, 1985) (8 pages) doi:10.1115/1.3242472 History: Received March 28, 1983; Online October 26, 2009

Abstract

Measurements on the mean and most of the significant turbulent properties of plane isothermal and heated (but essentially “nonbouyant”) jets are reported. The velocity measurements were made using two-component, frequency-shifted Laser Doppler Anemometry (LDA) and the temperature measurements were made using fast-response resistance thermometry. A simple but effective technique was developed for obtaining accurate velocity measurements from the LDA in a nonisothermal environment. These measurements, some of which are the first of their kind, provide an independent data base with which to compare existing hot-wire data on jets. The LDA measurements indicate lower turbulence intensities and lower turbulent fluxes compared to the hot-wire data.

Copyright © 1985 by ASME
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