Experimental Investigation Of
Grid-generated Turbulence Using
Ultrasonic Travel-time Technique
Author(s)
W. Durgin & T. Andreeva
Abstract
This paper presents a summary of experimental work conducted by the authors
in the area of acoustical wave propagation through turbulent media. The
ultrasonic time-of-flight method, using dual transducers, is utilized to determine
some characteristics of grid-generated turbulent flow produced in a low
turbulence, low speed open circuit type wind tunnel. The experimental work
utilizes the high speed Data Acquisition (DAQ) card, Labview Software
connecting the experimental apparatus and computer, Low Speed Wind Channel
with ultrasonic transducers placed in it and customary built grids, with heating
elements inside.
Keywords: ultrasonic travel time technique, caustics.
1 Introduction
There has been an intensive research work focusing on ultrasonic flow meters
and their capabilities for measuring non-ideal flows [3]. Evidence of ultrasonic
technology’s value to industry as effective flow diagnostic solutions can be taken
from the fact that the Ultrasonic Flow Metering market size quoted in 2002 at
nearly $406 Million dollars, is projected to expand to a $600 Million dollar
industry by 2007. New applications for ultrasonic technology continue to emerge
but its potential will depend on the innovations that take place in the future.
The classical theory of acoustic wave propagation through turbulence predicts
linear increase of the first-order travel-time variance with the propagation
distance. However, recent numerical and theoretical studies exhibit an almost
quadratic growth of travel time variance with travel distance [4],[5],[6]. This
Keywords
ultrasonic travel time technique, caustics.
Related Book
Other papers in this volume
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