Effects of engine acoustic waves on optical environment around turrets in-flight on AAOL-T

Nicholas De Lucca; Stanislav Gordeyev; Eric J. Jumper; Donald J. Wittich

doi:10.1117/1.OE.57.6.064107

27 June 2018 Effects of engine acoustic waves on optical environment around turrets in-flight on AAOL-T

Nicholas De Lucca, Stanislav Gordeyev, Eric J. Jumper, Donald J. Wittich

Author Affiliations +

Optical Engineering, Vol. 57, Issue 6, 064107 (June 2018). https://doi.org/10.1117/1.OE.57.6.064107

Abstract

Wavefront measurements were performed in-flight for a hemispherical turret on the Airborne Aero-Optics Laboratory-Transonic (AAOL-T). For turret side-looking angles near 90 deg, upstream-propagating optical distortions over the turret aperture were observed. These distortions were contributed to acoustic waves originating from the engine downstream of the turret. The acoustical waves were modeled by combining a potential flow solution for a single-frequency moving acoustic source and a potential flow around a sphere. The model was shown to properly predict the spatial statistics and convective speeds of the experimentally observed wavefronts. The model also correctly explained the viewing-angle dependence of the acoustic-related optical distortions. It was shown that for side-viewing angles between 90 deg and 100 deg, these acoustical distortions can be a significant contributor to the overall aero-optical distortions.

Citation Download Citation

Nicholas De Lucca, Stanislav Gordeyev, Eric J. Jumper, and Donald J. Wittich "Effects of engine acoustic waves on optical environment around turrets in-flight on AAOL-T," Optical Engineering 57(6), 064107 (27 June 2018). https://doi.org/10.1117/1.OE.57.6.064107

Received: 15 March 2018; Accepted: 5 June 2018; Published: 27 June 2018

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