Initial Development and Calibration of a Design Guide for Jet Noise Reduction

Stone, James R.; Berton, Jeffrey J.; Krejsa, E. A.; Clark, B. J.

doi:10.2514/6.2004-3315

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Engine-state data computed by NPSS are fed into ANOPP as functions of flight speed, altitude and engine power setting. Jet noise, fan noise, fan treatment suppression, core noise and several airframe sources are predicted using the methods of Stone (18) , General Electric (19,20) . Emmerling (21) and Fink (22) .…”

Section: Analysis and Discussionmentioning

confidence: 99%

Noise predictions for a supersonic business jet using advanced take-off procedures

et al. 2018

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Supersonic civil aircraft present a unique noise certification challenge. High specific thrust required for supersonic cruise results in high engine exhaust velocity and high levels of jet noise during take-off. Aerodynamics of thin, low-aspect-ratio wings equipped with relatively simple flap systems deepen the challenge. Advanced noise reduction procedures have been proposed for supersonic aircraft. These procedures promise to reduce certification noise levels, but they may require departures from normal reference procedures defined in noise regulations. The subject of this article is a take-off performance and noise assessment of a notional supersonic business jet. Analytical models of an airframe and a supersonic engine derived from a contemporary subsonic turbofan core are developed. These models are used to predict take-off trajectories and certification noise levels. Results indicate advanced take-off procedures are helpful in reducing noise along lateral sidelines.

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Section: Analysis and Discussionmentioning

confidence: 99%

Noise predictions for a supersonic business jet using advanced take-off procedures

et al. 2018

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“…The work of Engblom et al[45] presents an example of applying the MGBK method, which will be presented in Chapter 3, to predicting the far-field acoustics from a jet with chevrons, resulting in discrepancies in the noise level predictions. Other prediction methods specifically designed for chevron nozzles are available in the literature, such as the one proposed by Stone et al[46][47][48] where a semi-empirical model was developed. But still, the predictions are limited to certain jet operation conditions and also have geometric constraints (number of lobes) as the method was developed based entirely on experimental data.…”

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confidence: 99%

Desenvolvimento de um novo método RANS-based para a aeroacústica computacional de jatos de alta velocidade.

Silva¹

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I would like to thank my advisor and my friend Prof. Dr. Julio R. Meneghini for his guidance, patience and also for believing in my work. I have very much appreciated the encouraging and needed talks we had during the duration of this research. Many thanks also to Dr. Rod Self who gave me the opportunity to work as part of the Fluid Dynamics and Acoustics Group (FDAG) in the Institute of Sound and Vibration Research (ISVR) in UK. Dr. Rod Self also supervised this research and he was always available and happy to help and facilitate my work. It was an honor to work with you. I would like to thank the many colleagues and officemates that I have had as a graduate student in USP (NDF-Fluid & Dynamics Research Group at Poli) and in Southampton (ISVR). I would specially thanks Dr. Mahdi Azarpeyvand for his help, support and advices on a countless number of technical aspects of this research. Mahdi was a constant source of new ideas and he always explained aeroacoustics in a way that even I understand. Thanks also to my friend Dr. Odenir de Almeida who introduced me to the engine noise problem years ago and convinced me to study aeroacoustics. I would like to thank my parents, Carlos and Luciane, for providing me one of the most important and perineum asset: education. Thanks to my dear brothers, Rodolfo and Bárbara, for all the advices and support during the different phases of our lives. To all my friends that are spread out around the world (Brazil, USA, UK, China, France, etc.) thanks very much. You are definitely part of this accomplishment. I would like to gratefully acknowledge my funding for this research work, which has been provided by CAPES. Finally, thanks to EMBRAER S.A. for providing me the opportunity to conduct this work and FAPESP for the "Aeronave Silenciosa: Uma investigação em aeroacústica" research project.

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Brazilian Silent Aircraft Program

Carmo

Meneghini

2010

SAE Technical Paper Series

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Initial Development and Calibration of a Design Guide for Jet Noise Reduction

Abstract: This paper describes the initial development of a design guide for jet noise reduction, utilizing the NASA/MTC Technologies jet noise prediction capabilities for baseline and complex suppressor geometries.

Cited by 3 publications

References 7 publications

Noise predictions for a supersonic business jet using advanced take-off procedures

Noise predictions for a supersonic business jet using advanced take-off procedures

Desenvolvimento de um novo método RANS-based para a aeroacústica computacional de jatos de alta velocidade.

Brazilian Silent Aircraft Program

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