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Title:Aerodynamic modeling and assessment of flaps for hypersonic trajectory control of blunt bodies
Author(s):Sepulveda, Jose
Advisor(s):Putnam, Zachary R
Department / Program:Aerospace Engineering
Discipline:Aerospace Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:M.S.
Genre:Thesis
Subject(s):flaps
trim-tabs
blunt-bodies
hypersonic trajectory control
Abstract:Independently articulated aerodynamic flaps on a blunt-body entry vehicle may provide a feasible alternative to current state-of-the-art bank-angle steering control while introducing additional benefits during entry, descent, and landing. Flaps provide direct control of the vehicle’s lift and drag vectors, eliminating the need for a center of gravity offset and enabling a relatively constant vehicle attitude. A near-constant attitude may allow the use of relative navigation sensors and regional-scale science instruments during the hypersonic portion of entry. Direct aerodynamic vector control also enables active regulation of heating and reduces or eliminates the need for a reaction control system in the hypersonic regime. The Configuration-Based Aerodynamics tool was used to predict the trim angle of attack, trim lift-to-drag ratio, lift coefficients, and drag coefficients for variations in the number of flaps, individual flap configurations, and deployment angles. Aerodynamic data is validated against static trim-tab data from the literature. Results for one flap above the entry vehicle are presented for the hypersonic regime with the angle of attack ranging from -4 degrees to 20 degrees. These results demonstrate the effects of a flap on the aerodynamic performance of an entry vehicle and will inform the development of guidance, navigation, and control systems for various flap configurations on entry vehicles.
Issue Date:2017-07-21
Type:Thesis
URI:http://hdl.handle.net/2142/98438
Rights Information:Copyright 2017 Jose Sepulveda
Date Available in IDEALS:2017-09-29
Date Deposited:2017-08


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