Flight Measurements of the Aero-Optical Environment Around a Flat-Windowed Turret

Modal Analysis of the Surface Pressure Field Around a Hemispherical Turret using Pressure Sensitive Paint

“…There has been extensive experimental work done to study these hemispherical turrets in the last decade. This work includes characterizing both the aerodynamic [1,2,3] and aero-optic [4,5,6] performance of the flow around the turrets at subsonic and transonic speeds. In addition to these experimental studies, there have been extensive CFD studies into the flow around hemispherical turrets [7,8,9,10,11].…”

“…The surface pressure field on the turret carries both the signature of the turbulent structures in the turret's vicinity and any global pressure modes over the turret. Both the global pressure modes and the turbulent structures have been shown to affect the optical performance of the turret American Institute of Aeronautics and Astronautics [4,5,6]. Further, the unsteady loading on the turret is directly a function of the unsteady pressure field.…”

Global Unsteady Pressure Fields Over Turrets In-Flight

“…Local surface pressure measurements were performed using a 12 inch diameter turret with geometry identical to the AAOL optical turret [3,4,5]. This turret has realistic features including trunnion gaps, "smiles" cutouts and smaller secondary windows.…”

“…The aero-dynamic environment around turrets has been studied extensively in recent years using a variety of techniques. Optical wavefront and jitter measurements have been performed for different turret configurations both in flight [3,4,5] and in wind tunnels [6,7,8]. Unsteady surface pressure measurements at low subsonic speeds have also been performed in a tunnel using a combination of Pressure Sensitive Paint [2,9,10] and unsteady pressure sensors, although with a very sparse array of sensors [6,9].…”

The Comparison of Unsteady Pressure Field over Flat- and Conformal-Window Turrets using Pressure Sensitive Paint

“…The hemisphere-on-cylinder turret has been studied extensively in recent years. There has been a large parametric study of the aero-optical properties of this geometry in flight using the Airborne Aero-Optics Laboratory, AAOL [2,3]. Additionally a variety of CFD studies have been performed on the turret geometry [4][5][6][7].…”