Laminar Boundary Layer over a Serrated Backward-Facing Step

Author:

KC Real J.1ORCID,Wilson Trevor C.1ORCID,Lucido Nicholas A.2,Alexander Aaron S.3ORCID,Jacob Jamey D.1ORCID,Elbing Brian R.1ORCID

Affiliation:

1. Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK 74078, USA

2. Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA

3. Mechanical Engineering Technology, Oklahoma State University, Stillwater, OK 74078, USA

Abstract

Laminar flow over a modified backward-facing step (BFS) was studied experimentally and computationally, with the results compared to a flight test on a Piper Cherokee wing. The BFS was modified with a serrated spanwise variation while maintaining a constant step height, and this modification is termed a serrated BFS (sBFS). A scaling law was proposed and then used to develop the experimental operation conditions. The experiments showed evidence that the transition to turbulence was delayed over the forward part of the serration (termed the valley). The boundary layer growth and characterization were used to validate the computational model, which was then used to examine details not available from the experiment, including the wall shear stress distribution and streamlines as they go over the sBFS. The wall shear stress showed the formation of low-shear diamonds downstream of the sBFS valley that were associated with laminar flow, which confirmed previous assumptions about the low-shear diamonds observed in the flight tests. The length of the low-shear diamonds was scaled with the sBFS geometry. Finally, the streamlines showed that the near-wall flow forward of the sBFS is pumped towards the sBFS peak, where it rapidly transitions to turbulence at that location.

Funder

John Brammer Professorship

Edge Aerodynamix

Publisher

MDPI AG

Reference35 articles.

1. A review of research on subsonic turbulent flow reattachment;Eaton;AIAA J.,1981

2. Laminar separation, reattachment, and transition of the flow over a downstream-facing step;Goldstein;J. Fluids Eng.,1970

3. Chang, P.K. (1970). Separation of Flow, Pergamon Press.

4. A review of Backward-Facing Step (BFS) flow mechanisms, heat transfer and control;Chen;Therm. Sci. Eng. Prog.,2018

5. Passive Flow Control for Reduced Load Dynamics Aft of a Backward-Facing Step;Bolgar;AIAA J.,2019

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