Disturbance speed measurements in a circular jet via double focused laser differential interferometry

Joseph S. Jewell, Ahsan Hameed, Nicholaus J. Parziale, Sivaram Gogineni

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

50 Scopus citations

Abstract

Measurements and calculations of the phase speed of disturbances observed in turbulent jets of three diameters are made at speeds between 80 m/s and 300 m/s, via cross-correlation of signals from a double focused laser differential interferometer (D-FLDI). A consistent trend in correlation-derived disturbance propagation speeds is observed with varying jet velocity, and the strength of the correlation decreases as the jet is moved lat-erally through the interferometer away from the focus point. The correlation curves also collapse across varying jet velocities when normalized. The dual FLDI beams are im-aged and separation distances characterized using a beam profiler. Spectral density curves from the D-FLDI and hotwire anemometer at similar locations are compared. The effect of orienting FLDI bundles parallel with and at a 45° angle to the mean flow direction is assessed and shown to be minimal in terms of the disturbance velocity computed via cross-correlation.

Original languageEnglish
Title of host publicationAIAA Scitech 2019 Forum
DOIs
StatePublished - 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: 7 Jan 201911 Jan 2019

Publication series

NameAIAA Scitech 2019 Forum

Conference

ConferenceAIAA Scitech Forum, 2019
Country/TerritoryUnited States
CitySan Diego
Period7/01/1911/01/19

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