Effect of Stagger on the Vibroacoustic Loads from Clustered Rockets
| Autor: | Charles E. Tinney, Raymundo Rojo, Joseph H. Ruf |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
020301 aerospace & aeronautics
Engineering business.industry Acoustics Flow (psychology) Nozzle Aerospace Engineering Orifice plate 02 engineering and technology 01 natural sciences Pressure sensor 010305 fluids & plasmas 0203 mechanical engineering 0103 physical sciences Time derivative Kurtosis Waveform business Sound pressure |
| Zdroj: | AIAA Journal. 54:3588-3597 |
| ISSN: | 1533-385X 0001-1452 |
| DOI: | 10.2514/1.j055017 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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