Reprinted from 9th AIAA/CEAS Aeroacoustics Conference and Exhibit: Hilton Head, S.C., May 12, 2003, pages 1-6. AIAA 2003-3149. Reprinted with permission from 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.
The paper is devoted to the experimental investigation of the statistical characteristics of the grid-generated turbulence produced in a wind tunnel. Ultrasonic time-of-flight method using dual transducers is utilized to develop a methodology for determination of the correlation functions of turbulent velocity and sound speed fluctuations. The ultrasonic flowmeter equation is considered in the form that includes effects of turbulent velocity and sound speed fluctuations. The influence of temperature inhomogeneities on ultrasonic wave propagation is investigated using a set of experiments with a heated grid. Utilization of high-speed digital data acquisition cards and LabView software for the experiments allows collecting a significant amount of statistical data.