Fin-generated shock wave/turbulent boundary layer interactions on a cylindrical surface with a distorted incoming boundary layer

Joshua D. Pickles, Balachandra R. Mettu, Pramod K. Subbareddy, Venkateswaran Narayanaswamy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Interactions between an oblique shock wave generated by a single sharp fin placed on a cylindrical surface and a distorted incoming boundary layer are studied to investigate the possibility of generating high maneuverability for future munition systems. Well-quantified distortions are generated via micro-ramp vortex generators to embed strong streamwise vortices into the boundary layer. These vortex generators (VG) are 1.0 and 0.6 incoming boundary layer thicknesses tall, and their geometries are configured based on literature guidelines. The distortion magnitude determined based on the mean difference in the streamwise velocity from the undistorted boundary layer, integrated over boundary layer height, is between 20%-34% for a M = 2.6 boundary layer. The control forces and moments are determined using the mean surface pressure field for different VGs placed at different azimuthal locations with respect to the fin leading edge. These configurations resulted in up to 15%, 18% and 24% change in the fin-normal force, rolling and pitching moments, respectively, compared to the unperturbed results. The impact on the pitching moments provides compelling evidence that perturbing the boundary layer and exploiting the associated fin-generated shock boundary layer interactions is a viable strategy to enable high maneuverability in munitions.

Original languageEnglish (US)
Title of host publication2018 Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105531
DOIs
StatePublished - 2018
Externally publishedYes
Event48th AIAA Fluid Dynamics Conference, 2018 - Atlanta, United States
Duration: Jun 25 2018Jun 29 2018

Publication series

Name2018 Fluid Dynamics Conference

Other

Other48th AIAA Fluid Dynamics Conference, 2018
CountryUnited States
CityAtlanta
Period6/25/186/29/18

Bibliographical note

Funding Information:
for this investigation has been provided by the Army Research Office under grant W911NF-16-1-0072. The authors also thank Dr. Matthew Bryant and Ben Kirschmeier of North Carolina State University for their assistance in manufacturing the vortex generators.

Funding Information:
Funding for this investigation has been provided by the Army Research Office under grant W911NF-16-1-0072. The authors also thank Dr. Matthew Bryant and Ben Kirschmeier of North Carolina State University for their assistance in manufacturing the vortex generators.

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