Flow and Acoustic Properties of Low Reynolds Number Underexpanded Supersonic Jets PDF Download
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Author: Tieh-Feng Hu
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ISBN:
Category :
Languages : en
Pages : 0
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Author: Tieh-Feng Hu
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ISBN:
Category :
Languages : en
Pages : 0
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Author: Masashi Kashitani
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Category :
Languages : en
Pages :
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Author: Gerald Lee Morrison
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Category :
Languages : en
Pages : 394
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Author: Timothy Ray Troutt
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Category :
Languages : en
Pages : 194
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Author:
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Category : Aeronautics
Languages : en
Pages : 556
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Category : Aerodynamic noise
Languages : en
Pages : 112
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Author:
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Category : Aeronautics
Languages : en
Pages : 580
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A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA)
Author: John M. Seiner
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Category : Jet planes
Languages : en
Pages : 52
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Author: Kalyan Goparaju
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Category : Aerospace engineering
Languages : en
Pages : 174
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Jet noise has been a major source of concern for commercial and military aviation sectors alike. The need to assuage the adverse impact of jet noise on human health has led to increased interest in jet noise source identification and noise level minimization/mitigation. Most previous works on common round supersonic jets have primarily explored the ideal case of simple, perfectly expanded jet configurations. In real world scenarios however, many of these simplifications do not hold. Two such considerations are examined in this work. The first is a simple configuration operating at complex operating conditions, specifically an imperfect expansion i.e. where the jets are operating at off-design conditions. The second concerns a complex configuration at simple conditions: specifically two jets (twin-jets such as those on fighter aircraft) operating in close proximity to each other. In this work, Large Eddy Simulation (LES) based high-fidelity computations are used to understand the dynamics of imperfectly expanded and twin-jets respectively, with the following objectives: 1) Identify the impact of active flow control techniques on the plume dynamics and acoustic characteristics of underexpanded jets, and 2) Investigate the interaction dynamics of the twin-jet plumes and study its associated sound field which exhibits complex radiation characteristics.
Author: John M. Seiner
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ISBN:
Category : Air jets
Languages : en
Pages : 76
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