Towards shear flow measurements using femtosecond laser flow tagging

Yibin Zhang, Nathan Calver, Arthur Dogariu, Richard B. Miles

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Femtosecond Laser Electronic Excitation Tagging (FLEET) method is employed to measure wall shear stress in a supersonic flow. This study relies on the relationship between shear stress and velocity. We demonstrate the capability of FLEET to resolve velocity measurements in the viscous sublayer for shear stress calculations. In two of the studies, a 100µm thick, 2:5cm long fluorescent line is written into the flow and the displacement of the line is recorded after a time delay to give velocity measurements in the boundary layer of the flow, forming a velocity gradient that can then be translated into shear stress. In a third study, a single fluorescent point is written into the flow to reduce the projection ambiguity of a displaced line. Measurements are obtained from three different experimental configurations and a comparison of their respective advantages and disadvantages is given. It is shown that FLEET provides the spatial and temporal scales necessary to interrogate the boundary layers in these experiments. This study also sheds light on some diffculties of using a molecular tagging method to visualize supersonic flows in a confined space.

Original languageEnglish (US)
Title of host publication54th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103933
StatePublished - 2016
Event54th AIAA Aerospace Sciences Meeting, 2016 - San Diego, United States
Duration: Jan 4 2016Jan 8 2016

Publication series

Name54th AIAA Aerospace Sciences Meeting
Volume0

Other

Other54th AIAA Aerospace Sciences Meeting, 2016
CountryUnited States
CitySan Diego
Period1/4/161/8/16

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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