Characterization of the M = 4.5 flow over a flat-plate model with a 30 deg compression ramp was performed with low-enthalpy ( T 0 = 300    K ) and high-enthalpy ( T 0 = 800 1250    K ) flow conditions for a wide range of unit Reynolds numbers ( R e l = 4 10 5 1 10 7    m 1 ). Three measurement techniques were employed to measure the frequency spectrum of flow perturbations: a high-frequency Shack–Hartmann wavefront sensor (aerooptical method), high-frequency PCB™ pressure sensors, and a laser differential interferometer. The magnitude and frequency of flow oscillations measured by all three methods provide comprehensive and complementary results in determining spectra of gas disturbances within the flow. Of these measurement methods, the Shack–Hartmann wavefront sensor is shown to be the most suitable tool for analysis of the high-speed flow. Aerooptical measurements detect modification to the flow structure when plasma actuation is employed or when R e l is varied. In this work, flow characterization by the Shack–Hartmann sensor at individual points over the ramp has shown three flow regimes depending on the unit Reynolds number: turbulent, transitional, and laminar. At higher R e l , the freestream disturbances become strong enough to significantly affect the perturbations in the boundary-layer and the separation zone on the compression ramp. Frequency spectrum measurements during high-frequency plasma actuation ( F = 100    kHz ) indicate amplification of the perturbations from the natural state that occur over the separation region.


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    Titel :

    Measurement of Flow Perturbation Spectra in Mach 4.5 Corner Separation Zone


    Beteiligte:
    Hedlund, Brock (Autor:in) / Houpt, Alec (Autor:in) / Gordeyev, Stanislav (Autor:in) / Leonov, Sergey (Autor:in)

    Erschienen in:

    AIAA Journal ; 56 , 7 ; 2699-2711


    Erscheinungsdatum :

    01.07.2018




    Medientyp :

    Aufsatz (Konferenz) , Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Measurement of Plasma Induced Flow Perturbations Affecting a Mach 4.5 Corner Separation Zone

    Hedlund, Brock E. / Houpt, Alec W. / Gordeyev, Stanislav et al. | AIAA | 2017


    Transient Plasma Impact on Spectra of Flow Disturbances in a Corner Separation Zone at Mach 4.5

    Houpt, Alec / Hedlund, Brock / Gordeyev, Stanislav et al. | AIAA | 2016


    Measurement of Plasma Induced Flow Perturbations Affecting a Mach 4.5 Corner Separation Zone (AIAA 2017-0154)

    Hedlund, Brock E. / Houpt, Alec W. / Gordeyev, Stanislav et al. | British Library Conference Proceedings | 2017


    Transient Plasma Impact on Spectra of Flow Disturbances in a Corner Separation Zone in Mach 4.5 (AIAA 2016-4304)

    Houpt, Alec / Hedlund, Brock / Gordeyev, Stanislav et al. | British Library Conference Proceedings | 2016