Flight dynamics of a hypersonic vehicle during inlet un-start

Michael A. Bolender, Heidi Wilkin, Lance Jacobsen, Travis Drayna, Andrew Dwenger

Research output: Chapter in Book/Report/Conference proceedingConference contribution

19 Scopus citations

Abstract

The aerodynamics and the stability and control characteristics of a hypersonic vehicle that is has an un-started inlet are addressed. The vehicle considered is a generic scramjet- powered flight test vehicle with a 3D, inward-turning inlet and cruciform fins for control. An analysis of aerodynamic prediction methods for the vehicle with inlet started are given and shows that engineering methods are satisfactory for predicting the external aerodynamics when compared to CFD. However, during un-start, the engineering methods do not capture the effect of the normal shock that stands outside the inlet; therefore, CFD is necessary to assess the vehicle aerodynamics. An analysis of the open-loop flight dynamics of the vehicle was performed for both the started and un-started inlet. A nominal control law to track a commanded flight-path angle is designed using the started inlet aerodynamics. It is shown that the un-started inlet destabilizes the controller, with a rather large time-to-double, but the aircraft angle-of-attack transient settles rather quickly, which should allow for the inlet to be re-started.

Original languageEnglish (US)
Title of host publication16th AIAA/DLR/DGLR International Space Planes and Hypersonic Systems and Technologies Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781600867408
DOIs
StatePublished - 2009
Externally publishedYes

Publication series

Name16th AIAA/DLR/DGLR International Space Planes and Hypersonic Systems and Technologies Conference

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