Reprinted from 42nd AIAA Aerospace Sciences Meeting and Exhibit: Reno, NV, January 5, 2004, pages 1-5. AIAA 2004-1032. Reprinted with permission of the American Institute of Aeronautics and Astronautics, Inc. Publisher website: http://www.aiaa.org/content.cfm?pageid=2
NOTE: At the time of publication, the author William Durgin was not yet affiliated with Cal Poly.
An experimental technique for investigation of the behavior of acoustic wave propagation through a turbulent medium is discussed. The present study utilizes the ultrasonic travel-time technique to diagnose a grid-generated turbulence. The statistics of the travel-time variations of ultrasonic wave propagation along a path are used to determine some metrics of the turbulence. Experimental data obtained using ultrasonic technique confirms numerical and theoretical predictions of nonlinear increase of the first-order travel time variance with propagation distance.