Title: Effects of Threadlike Roughness on a High-Slenderness Finned Projectile at Supersonic Speeds
Authors: Michalski, Sebastian
Hruschka, Robert
Klatt, Daniel
Bastide, Myriam
Breuer, Michael 
Language: eng
Keywords: Threadlike Roughnes;High-Slenderness Finned Projectile;Supersonic Speed
Subject (DDC): 000 Informatik, Information & Wissen, allgemeine Werke
500 Naturwissenschaften
600 Technik
Issue Date: Jun-2023
Document Type: Conference Object
Source: AIAA 2023-4495
Conference: AIAA AVIATION Forum 12-16 June 2023, San Diego, CA and Online AIAA AVIATION 2023 Forum
The aerodynamic properties of a high-slenderness finned projectile with and without a threadlike roughness element on its shaft are evaluated by force and moment balance measurements in a supersonic blow-down tunnel. The test conditions cover a Mach number range from 2.5 to 4.1 at diameter-based Reynolds numbers in the order of 8 × 10^5. The forebody axial force is increased by approximately 15 % by the roughness element at zero angle of attack. Further measurements at non-zero angles of attack show that this axial force increase growths over-proportionately with the angle of attack. Whereas a minor influence by the roughness element is observed for the normal force, the pitching moment is either decreased by about 7 % or increased by about 13 % depending on the flow condition and angle of attack. Flow visualization by a high-resolution schlieren setup gives insight into the flow physics responsible for these phenomena. The schlieren setup also enables the detection of the laminar-turbulent boundary layer transition.
Organization Units (connected with the publication): Strömungsmechanik 
URL: https://arc.aiaa.org/doi/abs/10.2514/6.2023-4495
Publisher DOI: 10.2514/6.2023-4495
Appears in Collections:3 - Reported Publications

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