Influence of surface imperfections caused by thruster elements on the aerodynamics of a supersonic projectile. (1st January 2014)

• Record Type: Journal Article
• Authors: Hruschka, R.; Klatt, D.; Leopold, F.
• Is Part Of: International journal of engineering systems modelling and simulation. Volume 6:Number 3/4(2014)
• Page Start: 115
• Page End: 123
• Publication Date: 2014-01-01
• Subjects: supersonic -- projectile -- wind tunnel measurement -- computational fluid mechanics -- CFD -- detached eddy simulations -- DES -- numerical simulation -- sub-boundary-layer disturbance -- circular cavity -- side-jet thruster; Engineering systems -- Computer simulation -- Periodicals; Engineering systems -- Mathematical models -- Periodicals; 620.0042
• Languages: English
• ISSNs: 1755-9758

Abstract

Pulsed side jet thrusters can be used to correct the trajectory of supersonic projectiles. After their time-of-action, these pyrotechnical thrusters leave a hole in the shaft, which sometimes also features a protuberance or burr at its rim. The current work quantifies the aerodynamic interference caused by this sub-boundary-layer disturbance by means of 3-axis-force balance measurements in a supersonic wind tunnel at Mach 3 at angles of attack between 0 and 10 degrees. Supplementary numerical time- and scale-resolving detached eddy simulations (DES) of the wind tunnel setup as well as basic theoretical correlations also support the experimental result that aerodynamic coefficients change by less than 2%, if the hole diameter is in the order of half a calibre and surface deformations protrude less than 2.5% of the calibre.