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K. Brianna Dowdy
Missouri University of Science and Technology
Advisor: Dr. Serhat Hosder
Abstract
A multi-fidelity approach is optimal for aerothermodynamic analysis of re-entry geometries, since it reduces both computational time and cost in the conceptual design phase. A low fidelity analysis was conducted as part of a multi-fidelity framework being developed using HEAT-TK program, which utilizes S/HABP code on generic capsule geometries. This work included parametric studies performed to calculate aerodynamic coefficients and heat flux for different sphere-cone shaped re-entry vehicles. The three geometric parameters used in these studies were the radius of curvature (R), diameter (D), and the angle of the conical portion of the capsule (?). Each of these parameters was changed by ±10% from their baseline values. The lift (cl), drag (cd), heat transfer coefficients, the lift-to-drag ratio (L/D), and heat fluxes are not affected by changes in ?. The stability derivative, cl? is negative, and becomes more negative be either increasing the diameter or decreasing the radius of curvature. By increasing the diameter, the drag coefficient is dramatically increased, while the radius of curvature does not seem to affect cd. The L/D ratio is not drastically affected by changing either R or D: the maximum changes were within ±5% of the control value. The heat flux decreases by increasing the diameter, which is expected since the area of the aeroshell is increased, and the heat flux peaks on the spherical portion the aeroshell. In the future, higher fidelity analyses will be conducted on the capsule geometry with hypersonic CFD models along with the analyses on other geometries.
K. Brianna Dowdy is from Rolla, MO and is junior double majoring in Aerospace and Ceramic Engineering at Missouri S&T. After graduation she would like to work with high temperature ceramics for aerospace applications.
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