PWM-CTA VORTICITY MEASUREMENTS AT THE SLTEST SITE

John Foss

Department of Mechanical Engineering

Michigan State University

East Lansing, MI  48824

E-mail:  foss@egr.msu.edu

 

Abstract

 

The MSU “team”, from the Turbulent Shear Flows Lab, has been involved with the summer field trials at the SLTEST site (Dugway Proving Grounds) for several years…typically just to the west of the AEM-Uni. Minnesota-Marusic team.  The shared objectives, with all groups, is to probe the near-wall velocity field properties of the very high Rq turbulent boundary layers provided at this unique site.  The distinctive MSU contribution is the evaluation of the spectral properties of the expression:

 

 

The 2003 measurements have utilized, for the first time, the “evolved” PWM-CTA.  This novel (pulse width modulated) approach to constant temperature anemometry provides a device with greater sensitivity and ease of acquiring simultaneous samples in comparison with conventional CTA’s.

 

The presentation will describe the PWM-CTA, the four-sensor vorticity probe(s) that were positioned ca 15cm above the surface, and the derived results-to-date from 2003.

 

This presentation is also made with a “money back guarantee” that you will not be bored.