A new ray tracing model for aero-optical effect simulation of laminar flow field surrounding highly supersonic projectile with cone shape head

Sehyun Seong; Sug-Whan Kim; Sangmin Kim; Dongok Ryu; Ho Gyun Kang

doi:10.1117/12.2067590

18 November 2014 A new ray tracing model for aero-optical effect simulation of laminar flow field surrounding highly supersonic projectile with cone shape head

Sehyun Seong, Sug-Whan Kim, Sangmin Kim, Dongok Ryu, Ho Gyun Kang

Author Affiliations +

Proceedings Volume 9249, Electro-Optical and Infrared Systems: Technology and Applications XI; 92491C (2014) https://doi.org/10.1117/12.2067590
Event: SPIE Security + Defence, 2014, Amsterdam, Netherlands

Abstract

We present the apparent optical performance variation of an infrared sensor caused by laminar flow field surrounding a highly supersonic projectile with cone shape head. An optical ray tracing model was constructed and numerical simulations of the aero-optical effects were performed by computational fluid dynamics (CFD) analysis and isodensity surface based ray tracing computation. To maximize modeling and computation efficiency, the number of sampling isodensity layers was reduced to less than 5 for improved discretization of the inhomogeneous gradient index (GRIN) media. Using this method, the simulation results show that the BSE is smaller than about 2.8 arcsec when the projectile flies at 25, 35, 50 km in altitude, Mach 4, 6 in speed, and 0°, 10° in angle of attack. The technical details and implications of the optical ray tracing model are presented together with the simulation results.

Citation Download Citation

Sehyun Seong, Sug-Whan Kim, Sangmin Kim, Dongok Ryu, and Ho Gyun Kang "A new ray tracing model for aero-optical effect simulation of laminar flow field surrounding highly supersonic projectile with cone shape head", Proc. SPIE 9249, Electro-Optical and Infrared Systems: Technology and Applications XI, 92491C (18 November 2014); https://doi.org/10.1117/12.2067590

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