Record Details

Effect of Stagger on the Vibroacoustic Loads from Clustered Rockets
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Author and Affiliation:
Rojo, Raymundo(Texas Univ., Center for Aeromechanics Research, Austin, TX, United States);
Tinney, Charles E.(Texas Univ., Applied Research Lab., Austin, TX, United States);
Ruf, Joseph H.(NASA Marshall Space Flight Center, Huntsville, AL, United States)
Abstract: The effect of stagger startup on the vibro-acoustic 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. 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 prior to flowing full. Acoustic pressure waveforms recorded at the base of the nozzle clusters 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 ignition is staggered. However, regardless of stagger, both the skewness and kurtosis of the acoustic pressure time derivative elevate to the same levels during the end-effects-regime event thereby demonstrating the intermittence and impulsiveness of the acoustic waveforms that form during engine startup.
Publication Date: Jan 04, 2016
Document ID:
20160001812
(Acquired Feb 16, 2016)
Subject Category: ACOUSTICS; SPACECRAFT PROPULSION AND POWER
Report/Patent Number: M16-5031
Document Type: Conference Paper
Meeting Information: AIAA SciTech Forum and Exposition; 4-8 Jan. 2016; San Diego, CA; United States
Meeting Sponsor: American Inst. of Aeronautics and Astronautics; Reston, VA, United States
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL, United States
Description: 16p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: ACOUSTICS; VIBRATIONAL STRESS; WAVEFORMS; LOADS (FORCES); ROCKET NOZZLES; SOUND WAVES; WAVELET ANALYSIS; SOUND PRESSURE; SKEWNESS; KURTOSIS; FREQUENCIES; LIQUID PROPELLANT ROCKET ENGINES
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