This study demonstrates the usefulness of instantaneous and mean density ρ , standard deviation σ , relative standard deviation σ / ρ , and product standard deviation σ * ρ acquired using a low-sampling-rate instantaneous (10 ns) laser-based method to study effects of high-frequency phenomena on offbody freestream, bow-shock wave, and gas-cap unsteadiness. Spatial correlations of relative flow unsteadiness are acquired using laser Rayleigh scattering performed along a 38.7 mm line containing 200 pixels spanning the freestream, gas cap, near-normal, and oblique shocks created by a multipurpose crew vehicle model in the NASA Langley 31-in. Mach 10 air wind tunnel. A total of 371 instantaneous images are acquired at a fixed stagnation temperature of 990 ± 11    K and five stagnation pressures spanning 2.41–10.0 MPa (350–1454 psi). Maximum σ occurs at the bow-shock-wave spatial density profile first-derivative maximum for a near-normal and oblique shock. Maximum σ / ρ and σ * ρ occur at the bow-shock-wave spatial density profile second-derivative maximum and minimum, respectively, for both the near-normal and oblique shocks. At P 0 = 1454    psi , maximum σ (normal shock) > 5 / 2 σ (gas cap), and σ (gas cap) is > 2 σ (freestream). Additional spatially averaged unsteadiness correlations with flowfield conditions are presented.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Mach 10 Bow Shock and Gas-Cap Unsteadiness Measurements Using Rayleigh Scattering


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 54 , 10 ; 3062-3074


    Erscheinungsdatum :

    2016-06-20


    Format / Umfang :

    13 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






    Mach 3 Shock Wave Unsteadiness Alleviation Using a Negative Corona Discharge

    Elias, P.-Q. / Chanetz, B. / Larigaldie, S. et al. | AIAA | 2008



    Mach 3 Shock-Wave Unsteadiness Alleviation Using a Negative Corona Discharge

    Elias, P. / Chanetz, B. / Coponet, D. et al. | British Library Conference Proceedings | 2006