Fluid Mechanics Research Journal (FMRJ)

Research Article

Comparison of the Turbulent Length Scales of Three Different Boundary Layers within a Compressible Flow Facility

Peter J Disimile¹ and Norman Toy²

¹Department of Aerospace Engineering, University of Cincinnati, Cincinnati, Ohio 47006, USA.

²Engineering & Scientific Innovations Inc, 7383 Dixie Hwy, Fairfield, OH 45014, USA.

Submitted: September 30, 2019; Accepted: December 4, 2019

Abstract

Three different turbulent boundary layers have been generated within a low speed compressible flow facility and the Kolmogorov, Taylor and the Integral length scales were determined. One of the boundary layers was allowed to develop naturally, with a second one being produced by a trip and vortex generators, and with the third one by including a uniform surface roughness downstream of the vortex generators. A temperature compensated single hot-wire probe, operating at a sampling frequency of 45 kHz, was used to acquire turbulent boundary layer data from a single location. It was found that evidence of the turbulent generating devices was readily discernible in the turbulent boundary layer and could be identified within the Taylor and the Integral length scales but not for the Kolmogorov scales although their effect was detected.

Keywords

Turbulent boundary layers; Length scales; Dissipation rates.

Downlaod Full Text >>