The effect of stagger startup on the vibroacoustic loads that form during the end-effects regime of clustered rockets is studied using both full-scale (hot-gas) and laboratory-scale (cold-gas) data with vehicle geometry. Both configurations comprise three nozzles with thrust-optimized parabolic contours that undergo free-shock separated flow and restricted-shock separated flow as well as an end-effects regime before flowing full. Acoustic pressure waveforms recorded at the base of the nozzle cluster are analyzed using various statistical metrics as well as time-frequency analysis. The findings reveal a significant reduction in end-effects regime loads when engine startups are staggered. However, regardless of stagger, both the skewness and kurtosis of the acoustic pressure time derivative elevate to the same levels, thereby demonstrating the intermittence and impulsiveness of the acoustic waveforms during the end-effects regime.


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    Title :

    Effect of Stagger on the Vibroacoustic Loads from Clustered Rockets


    Contributors:

    Published in:

    AIAA Journal ; 54 , 11 ; 3588-3597


    Publication date :

    2016-06-06


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






    Vibroacoustic loads during the end effects regime of clustered rockets

    Rojo, Raymundo / Tinney, Charles E. / Ruf, Joseph H. | AIAA | 2016


    Vibroacoustic Loads During the End Effects Regime of Clustered Rockets (AIAA 2016-1016)

    Rojo, Raymundo / Tinney, Charles E. / Ruf, Joseph H. | British Library Conference Proceedings | 2016