Noise Reduction of Multinozzle Rocket Jet by Multideck Water Injection
Publication: Journal of Aerospace Engineering
Volume 37, Issue 2
Abstract
During the launch phase of a multinozzle rocket, the high-level noise induced by the supersonic jet ejected from the nozzles significantly affects the structural safety of the rocket and the reliability of the instruments. Therefore, it is important to predict and suppress the multinozzle rocket jet noise. This study proposes a numerical analysis method that uses the detached eddy simulation model combined with species transport equations, the discrete-phase model, and the acoustic analogy method (FW-H). It aims at a four-nozzle liquid rocket to predict jet and noise environments while considering the physical effect of evaporation and the influence of the launch pad structure. The proposed method was verified by comparing the single-nozzle jet simulation and experiment results. The prediction of the supersonic jet flow field and noise environment at different lift-off heights of the rocket was completed. An annular water jet noise-reduction system was designed to suppress the noise environment at different heights by single-deck and double-deck water injections. The noise attenuation effect of the water injection system was better when the lift-off altitude increased. And the noise suppression effect of the double-deck water injection system was more comprehensive than that of the single-deck water injection system. Furthermore, the reasons for the difference in noise reduction by different layers of water injection were analyzed in detail.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are proprietary or confidential in nature and may only be provided with restrictions (The model of the rocket launch system is proprietary, and the size details are not convenient to disclose).
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant number u20b2002), Project B18040, and the K. C. Wong Education Foundation. The work is also supported by the HPC Platform, Xi’an Jiaotong University.
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Published In
Journal of Aerospace Engineering
Volume 37 • Issue 2 • March 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Feb 15, 2023
Accepted: Nov 2, 2023
Published online: Jan 8, 2024
Published in print: Mar 1, 2024
Discussion open until: Jun 8, 2024
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