Experimental investigation of grid-generated turbulence using ultrasonic travel-time technique

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.