Overview of Experimental Study of the Influence of Grid-generated Turbulence on Ultrasound Wave Propagation
Abstract
The paper presents a summary of experimental and theoretical work conducted by authors in the area of acoustical wave propagation through turbulent media. The statistics of the travel-time variations of ultrasonic wave propagation along a path are used to determine some metrics of the turbulence. It is shown that the technique can be used to study the effect of turbulence on acoustic waves in terms of the travel time for various mean velocities and for different angular orientations of the acoustic waves with respect to the mean flow. The influence of temperature inhomogeneities on ultrasonic wave propagation is investigated using a set of experiments with a heated grid. Ultrasonic time-of-flight method is utilized to develop a semi-analytical methodology for determination of the correlation functions of turbulent velocity and sound speed fluctuations. Experimental data confirms numerical and theoretical predictions of nonlinear increase of the travel time variance with propagation distance (caustics).
- Publication:
-
APS Division of Fluid Dynamics Meeting Abstracts
- Pub Date:
- November 2004
- Bibcode:
- 2004APS..DFD.FM008A