Recent experimental supersonic retropropulsion tests were conducted at the NASA Langley Research Center Unitary Plan Wind Tunnel Test Section 2 for a range of Mach numbers from 2.4 to 4.6. A 5-inch 70-degree sphere-cone forebody model with a 10-inch cylindrical aftbody experimental model was used which is capable of multiple retrorocket configurations. These configurations include a single central nozzle on the center point of the forebody, three nozzles at the forebody half-radius, and a combination of the first two configurations with no jets being plugged. A series of measurements were achieved through various instrumentation including forebody and aftbody pressure, internal pressures and temperatures, and high speed Schlieren visualization. Specifically, several high speed pressure transducers on the forebody and in the plenum were implemented to look at unsteady flow effects. The following work focuses on analyzing frequency traits due to the unsteady flow for a range of thrust coefficients for single, tri, and quad-nozzle test cases at freestream Mach 4.6 and angle of attack ranging from -8 degrees to +20 degrees. This analysis uses Matlab s fast Fourier transform, Welch's method (modified average of a periodogram), to create a power spectral density and analyze any high speed pressure transducer frequency traits due to the unsteady flow.


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    Titel :

    Analysis of Dynamic Data from Supersonic Retropropulsion Experiments in NASA Langley's Unitary Plan Wind Tunnel


    Beteiligte:

    Kongress:

    42nd AIAA Fluid Dynamics Conference and Exhibit ; 2012 ; New Orleans, LA, Algeria


    Erscheinungsdatum :

    2012-06-25


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch




    ANALYSIS OF DYNAMIC DATA FROM SUPERSONIC RETROPROPULSION EXPERIMENTS IN NASA LANGLEY'S UNITARY PLAN WIND TUNNEL

    Codoni, J. / Berry, S. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2012





    Supersonic Retropropulsion Experimental Results from the NASA Langley Unitary Plan Wind Tunnel

    Berry, Scott A. / Rhode, Matthew N. / Edquist, Karl T. et al. | NTRS | 2011