Determination of convective velocity of eddies in turbulent channel flows using acoustic wave propagation

Document Type : Original Article

Authors

1 Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran

2 Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran.

Abstract

In recent years, the use of turbulent flow noise in internal flows, as a non-invasive method for measuring fluid flow velocity, has increasingly attracted the attention of engineers. The main challenge in this method is establishing a meaningful relationship between the characteristics of turbulent flow and the sound signals received on the wall. This paper investigates turbulent flow in a straight rectangular channel to explain the connection between turbulent flow structures and the acoustic signals recorded on the channel walls. The friction Reynolds number of the flow is 395, and the flow analysis is carried out using the Large Eddy Simulation (LES) method for a three-dimensional channel. After solving the flow field and obtaining the incompressible sources, the acoustic field is also derived using a hybrid acoustic model. Analyses showed that, at low Mach numbers, incompressible pressure fluctuations, known as pseudo-sound, dominate the sound spectrum. These fluctuations originate from the local convection of turbulent vortices on the channel walls and leave significant effects on the wall surface. These effects are measurable, and by tracking them along the channel walls, it is possible to determine the convection velocities of flow structures at different length scales. For large, energy-dominant structures (integral length scales), the convection velocities range between 0.6 to 0.8 times the mean channel velocity. It was also found that, with increasing the mean flow velocity, the accuracy of the velocity measurement obtained from this method is improved

Keywords

Main Subjects

References

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