Flush air data system calibration using numerical simulation

Johnston, I., Jacobs, P. A. and Shimoda, T. (1999) Flush air data system calibration using numerical simulation. Journal of Spacecraft and Rockets, 35 6: 812-820. doi:10.2514/2.3404


Author Johnston, I.
Jacobs, P. A.
Shimoda, T.
Title Flush air data system calibration using numerical simulation
Journal name Journal of Spacecraft and Rockets   Check publisher's open access policy
ISSN 0022-4650
Publication date 1999-01-01
Sub-type Article (original research)
DOI 10.2514/2.3404
Volume 35
Issue 6
Start page 812
End page 820
Total pages 9
Editor E. Vincent Zoby
Place of publication Reston, Va
Publisher American Institute of Aeronautics and Astronautics
Language eng
Subject C1
290299 Aerospace Engineering not elsewhere classified
690302 Space transport
Abstract The use of computational fluid dynamics simulations for calibrating a flush air data system is described, In particular, the flush air data system of the HYFLEX hypersonic vehicle is used as a case study. The HYFLEX air data system consists of nine pressure ports located flush with the vehicle nose surface, connected to onboard pressure transducers, After appropriate processing, surface pressure measurements can he converted into useful air data parameters. The processing algorithm requires an accurate pressure model, which relates air data parameters to the measured pressures. In the past, such pressure models have been calibrated using combinations of flight data, ground-based experimental results, and numerical simulation. We perform a calibration of the HYFLEX flush air data system using computational fluid dynamics simulations exclusively, The simulations are used to build an empirical pressure model that accurately describes the HYFLEX nose pressure distribution ol cr a range of flight conditions. We believe that computational fluid dynamics provides a quick and inexpensive way to calibrate the air data system and is applicable to a broad range of flight conditions, When tested with HYFLEX flight data, the calibrated system is found to work well. It predicts vehicle angle of attack and angle of sideslip to accuracy levels that generally satisfy flight control requirements. Dynamic pressure is predicted to within the resolution of the onboard inertial measurement unit. We find that wind-tunnel experiments and flight data are not necessary to accurately calibrate the HYFLEX flush air data system for hypersonic flight.
Keyword Engineering, Aerospace
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Mon, 13 Aug 2007, 20:51:42 EST