Results 31 to 40 of about 1,354,747 (243)
Design of a Facility for Studying Shock-Cell Noise on Single and Coaxial Jets
Aerospace, 2018 Shock-cell noise occurs in aero-engines when the nozzle exhaust is supersonic and shock-cells are present in the jet. In commercial turbofan engines, at cruise, the secondary flow is often supersonic underexpanded, with the formation of annular shock ...
Daniel Guariglia +2 more
doaj +1 more source
Numerical Investigation on the Cavitating Flow and the Cavitation-induced Noise in the Pump-jet Propeller [PDF]
Journal of Applied Fluid MechanicsThe noise hazard posed by cavitation in pump-jet propellers is a significant concern during oceanic operations. This study evaluates the cavitation performance and associated noise characteristics of pump-jet propellers in underwater conditions, further ...
P. Zhang, J. Yuan, Y. Fu, X. Hou, J. Hao
doaj +1 more source
Aerospace, 2021 Multiple competing factors are forcing aircraft designers to reconsider the underwing engine pod configuration typically seen on most modern commercial aircraft. One notable concern is increasing environmental regulations on noise emitted by aircraft. In
Colby Niles Horner +3 more
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Noise Reduction Using Synthetic Microjet Excitation in Supersonic Rectangular Jets
Applied SciencesThis work explores a potential methodology for rectangular jet noise reduction that employs nozzle unsteady microjet excitation. Using high-fidelity computational studies and spectral analyses, major jet noise sources impacted by the applied actuation ...
Michael Marques +3 more
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Design of a low-noise aeroacoustic wind tunnel facility at Brunel University [PDF]
, 2014 This paper represents the design principle of a quiet, low turbulence and moderately high speed aeroacoustic wind tunnel which was recently commissioned at Brunel University.
Kim, JH +5 more
core +1 more source
A: Universality in Vortex Formation. B: Evaluation of Mach Wave Radiation Mechanisms in a Supersonic Jet [PDF]
, 2000 In this thesis two distinct features of coherent structures are investigated. In Part I a model for the pinch-off process in vortex ring formation is developed.
Mohseni, Kamran
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Chengshi guidao jiaotong yanjiuObjective The jet noise generated by the main circuit breaker switching valve of high-speed railway EMU is excessively high, which seriously affects passenger comfort. Therefore, it is essential to study effective noise reduction measures.
Chao ZHANG +4 more
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Lava fountain jet noise during the 2018 eruption of fissure 8 of Kīlauea volcano
Frontiers in Earth Science, 2022 Real-time monitoring is crucial to assess hazards and mitigate risks of sustained volcanic eruptions that last hours to months or more. Sustained eruptions have been shown to produce a low frequency (infrasonic) form of jet noise.
Julia E. Gestrich +8 more
doaj +1 more source
Nonlinear mechanisms of sound generation in a perturbed parallel jet flow [PDF]
, 2006 An initial value problem with relevance to jet noise is investigated. A plane parallel jet flow is subjected to a spatially localized initial disturbance and is then left to evolve according to the two-dimensional compressible Navier–Stokes equations ...
Hu, Z.W., Morfey, C.L., Sandham, N.D.
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Jet fuel exposure and auditory outcomes in Australian air force personnel
BMC Public Health, 2019 Background Animal data suggest that jet fuels such as JP-8 are associated with hearing deficits when combined with noise and that the effect is more pronounced than with noise exposure alone.
Adrian Fuente +5 more
doaj +1 more source