Preprint Article Version 1 This version is not peer-reviewed

Affecting Wingtip Vortex Using Wing Surface Contours

Version 1 : Received: 30 June 2018 / Approved: 3 July 2018 / Online: 3 July 2018 (07:43:28 CEST)

How to cite: Gunasekaran, S.; Thomas, N. Affecting Wingtip Vortex Using Wing Surface Contours. Preprints 2018, 2018070028 (doi: 10.20944/preprints201807.0028.v1). Gunasekaran, S.; Thomas, N. Affecting Wingtip Vortex Using Wing Surface Contours. Preprints 2018, 2018070028 (doi: 10.20944/preprints201807.0028.v1).

Abstract

The aerodynamic efficiency of a NACA 0012 AR 4 wing was affected through periodic contours aligned in the flow direction resembling a “wrinkled” texture. Streamwise and cross-stream Particle Image Velocimetry (PIV) were conducted at the University of Dayton Low Speed Wind Tunnel (UD-LSWT) around Reynolds number of 135,000 on the NACA 0012 AR 4 wing with and without surface contours. Wings with 6 contour sections was designed by spline fitting two NACA 0012 airfoil profiles in the spanwise direction. Both 2D (wall-to-wall model) configuration and 3D configuration of the wings were tested to determine the effects of surface contours on the parasite and induced drag of the wing. Streamwise PIV results indicated an increase in momentum deficit in the wake of the mid-contour region due to enhanced boundary layer separation from the upper surface of the mid-contour region. The cross-stream PIV results indicated a decrease in the magnitude of azimuthal velocity, circulation and RMS quantities in the wingtip vortex with the surface contours. The reduction in the wingtip vortex properties indicates that the contours were effective in blocking the spanwise flow feeding into the wingtip vortex on the surface of the wing

Subject Areas

aerodynamic efficiency; surface fow; wrinkled/contoured surface; surface flow

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.