Blunt-forebody pressure data are used to study the behavior of the NASA Dryden Flight Research Center flush airdata sensing (FADS) pressure model and solution algorithm. The model relates surface pressure measurements to the airdata state. Spliced from the potential flow solution for uniform flow over a sphere and the modified Newtonian impact theory, the model was shown to apply to a wide range of blunt-forebody shapes and Mach numbers. Calibrations of a sphere, spherical cones, a Rankine half body, and the F-14, F/A-18, X-33, X-34, and X-38 configurations are shown. The three calibration parameters are well-behaved from Mach 0.25 to Mach 5.0, an angle-of-attack range extending to greater than 30 deg, and an angle-of-sideslip range extending to greater than 15 deg. Contrary to the sharp calibration changes found on traditional pitot-static systems at transonic speeds, the FADS calibrations are smooth, monotonic functions of Mach number and effective angles of attack and sideslip. Because the FADS calibration is sensitive to pressure port location, detailed measurements of the actual pressure port locations on the flight vehicle are required and the wind-tunnel calibration model should have pressure ports in similar locations. The procedure for calibrating a FADS system is outlined.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Flush Airdata Sensing (FADS) System Calibration Procedures and Results for Blunt Forebodies



    Conference:

    International Space Planes and Hypersonic Systems and Technologies ; 1999 ; Norfolk, VA, United States


    Publication date :

    1999-11-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




    Flush Airdata Sensing (FADS) System Calibration Procedures and Results for Blunt Forebodies

    Cobleigh, Brent R. / Whitmore, Stephen A. / Haering, Edward A., Jr. et al. | NTRS | 1999


    Flush airdata sensing (FADS) system calibration procedures and results for blunt forebodies

    Cobleigh, Brent / Whitmore, Stephen / Haering, Jr., Edward et al. | AIAA | 1999


    Design and calibration of the X-33 Flush Airdata Sensing (FADS) system

    Whitmore, Stephen / Cobleigh, Brent / Haering, Jr., Edward | AIAA | 1998


    Design and Calibration of the X-33 Flush Airdata Sensing (FADS) System

    Whitmore, S. A. / Cobleigh, B. R. / Haering, E. A. et al. | British Library Conference Proceedings | 1998


    In-flight demonstration of a Real-Time Flush Airdata Sensing (RT-FADS) system

    Whitmore, Stephen A. / Davis, Roy J. / Fife, John Michael | NTRS | 1995