Thoughts on Use of University-Scale Rocket Models to Study Launch Acoustics

Ahuja, K. K.; Alvord, David; Mattingly, Joseph R.; Mittelman, Josh; Dickey, Darryl

doi:10.2514/6.2014-3056

Cited by 4 publications

(2 citation statements)

References 9 publications

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Section: Introductionmentioning

confidence: 99%

“…Due to the risks to the health of the crew, the integrity of the rocket payload, electronics and launch vehicle, and the high noise pollution levels around the launch site, NASA included acoustics as one of the top five highest risk categories in their last three major rocket programs. 1 It is important to obtain a good understanding of the noise generation mechanisms during a rocket launch to effectively decrease the impacts of the acoustic loads. Empirical methods are described in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Flow and acoustics in a model rocket flame deflector and deflector cover

Yenigelen,

Morris

2023

International Journal of Aeroacoustics

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The design of a rocket launch environment is a complex process with many different aspects that are highly interconnected. Acoustics, which is one of these, should be investigated in detail due to possible devastating effects on the launch vehicle, crew, and launch environment. This study uses a numerical method to consider a passive noise reduction method applied to a supersonic jet impinging on an inclined flame deflector to decrease the acoustic loads on the launch vehicle and noise levels in the far-field. In a supersonic jet impinging on an inclined flat plate configuration, acoustic waves that travel upstream originate from the impingement and wall jet regions. These upstream traveling waves are a combination of the acoustic waves that are produced by the high speed jet flows in the wall jet region and acoustic waves that reflect from the impingement wall. Due to the inclination of the impingement plate, these waves either travel to the far-field in the upstream direction or travel towards the free-jet region interacting with the high speed flow near the nozzle lip. This interaction can create a self sustaining feedback loop, which can cause acoustic tones to appear in the near- and far-field spectra. It is the aim of the present study to block the upstream traveling waves by introducing a second inclined wall with a circular cut-out between the nozzle exit and the impingement plate. Different configurations with different wall locations and cut-out sizes are investigated using a Detached Eddy Simulation CFD solver and an acoustic solver that is based on the Ffowcs Williams and Hawkings analogy. The mechanisms for the establishment of the feedback loops are examined.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flow and acoustics in a model rocket flame deflector and deflector cover

Yenigelen,

Morris

2023

International Journal of Aeroacoustics

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Numerical study on jet noise suppression with water injection during one-nozzle launch vehicle lift-off

Xing

Deng

2022

Engineering Applications of Computational Fluid Mechanics

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Supersonic jet noise from launch vehicles: 50 years since NASA SP-8072

Lubert

Gee

Tsutsumi

2022

The Journal of the Acoustical Society of America

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In 1971, the U.S. National Aeronautics and Space Administration (NASA) published a seminal report—NASA SP-8072—which compiled the results of the early supersonic jet noise studies and provided methods to calculate the noise produced from launch vehicles. Fifty years later and despite known limitations, SP-8072 remains the foundation for much of the launch vehicle noise modeling today. This article reviews what has been learned about the physics of noise generation and radiation from free and impinging rocket plumes since the completion of SP-8072. State-of-the-art methods for the mitigation of launch vehicle noise are also reviewed. A discussion of launch vehicle noise modeling, from empirical to numerical and including reduced-order models of supersonic jets, points to promising approaches that can describe rocket noise characteristics not captured by SP-8072.

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Thoughts on Use of University-Scale Rocket Models to Study Launch Acoustics

Cited by 4 publications

References 9 publications

Flow and acoustics in a model rocket flame deflector and deflector cover

Flow and acoustics in a model rocket flame deflector and deflector cover

Numerical study on jet noise suppression with water injection during one-nozzle launch vehicle lift-off

Supersonic jet noise from launch vehicles: 50 years since NASA SP-8072

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