Master of Sciences, Case Western Reserve University, 2019, EMC - Aerospace Engineering

An octagonal supersonic nozzle and test section are developed for use with a magnetic suspension and balance system (MSBS) for testing dynamic stability in aeroshell re-entry models. A method of characteristics code is used with computational iterations to design an axisymmetric nozzle contour adjusted for boundary layer growth. Circular-to-octagonal transition schemes are developed to create a circular-to-octagonal nozzle. Computational calculations indicate the nozzles are shock free and operate at the desired Mach number. An experimental nozzle and test section are manufactured and tested for flow quality. Results indicate the nozzle is shock free and operates at a nominal Mach 2.45 +/- 0:04 as predicted in CFD

Committee: Paul Barnhart (Advisor); James T'ien (Committee Member); Yasuhiro Kamotani (Committee Member); David Davis (Committee Member) Subjects: Aerospace Engineering; Engineering; Fluid Dynamics

Master of Sciences, Case Western Reserve University, 2017, EMC - Aerospace Engineering

The feasibility of a magnetic suspension and balance system (MSBS) for testing dynamic stability of atmospheric entry capsules in the NASA GRC 225 cm2 Supersonic Wind Tunnel is investigated. The following are examined in the study: largest model size for testing in the MSBS, minimum proximity between wall and model, and analysis techniques using high-speed video images of model movement. Results indicate larger models can be tested in an axisymmetric test section and at locations closer to the nozzle exit resulting from lower boundary-layer blockage. Additionally, models contact the reflected shock from the boundary-layer at a 2.5 cm distance from centerline. Video analysis methods establish a measurement error of 0.6 degrees in pitch or yaw angle. Using these methods, a proof of concept demonstration for a one degree-of-freedom test in pitch simulating blunt body dynamic behavior is compared to ballistic range data for atmospheric entry vehicles.

Committee: Paul Barnhart Ph.D. (Advisor); Joseph Prahl Ph.D. (Committee Member); James T'ien Ph.D. (Committee Member) Subjects: Aerospace Engineering