Aero-Optical Evaluation of Notional Turrets

Join us for an hybrid talk on Thursday DEC 04 at 6:00 PM CST, on computational aero-optics by Dr. William J. Coirier. This presentation follows Anne-Marie Dorsett's overview of aero-optics, with a case study using 'turrets' on the outside of an airplane fuselage in varrious flow contions. Please plan to join in-person if you are able; a hybrid zoom link may become available at a future date.

Abstract:

The aero-optical performance of two notional turret designs, a hemisphere-on-plate and a submerged hemisphere-on-plate, are evaluated at Mach numbers ranging from purely subsonic, transonic, and supersonic using highly-resolved Detached Eddy Simulation (DES). The resolved density fluctuations in the flow fields are captured to compute the unsteady Optical Path Length (OPL) in propagation paths corresponding to a range of beam bearings and elevations. These OPL are processed to produce aperture-averaged wave front error, which are correlated to the different flow features produced around the turrets. In particular, the results show unsteady Shock Boundary Layer Interactions (SBLI), contact surface rollup and intense wake structures for the supersonic conditions. An unsteady transonic shock structure over the turret is observed at the transonic conditions. Large-scale vortical structures are observed in the wake for all Mach numbers. The effect of these various structures upon aero-optical performance is evaluated by comparing aperture-averaged wave front error for different beam bearings and elevations for the different notional turrets. Finally, the wave front error is correlated with unsteady flow features for each turret geometry.

About the Speaker:

Dr. Coirier received his Ph.D. in Aerospace Engineering from the University of Michigan and his Masters and Bachelor of Science degrees in Aeronautical and Astronautical Engineering from The Ohio State University and has 39 years of experience in the Aerospace Industry serving in both private industry and government positions. He is presently the Vice President and Senior Scientist of the Aerosciences Division at Kratos Defense and Rocket Support Services, Inc., and leads a team of engineers and scientists performing computational modeling and ground testing of high-speed missiles and aircraft.

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