Results 21 to 30 of about 228,844 (310)
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
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
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
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
doaj +1 more source
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
doaj +1 more source
Fitting Jet Noise Similarity Spectra to Volcano Infrasound Data
Earth and Space Science, 2021 Infrasound (low‐frequency acoustic waves) has proven useful to detect and characterize subaerial volcanic activity, but understanding the infrasonic source during sustained eruptions is still an area of active research.
J. E. Gestrich +4 more
doaj +1 more source
Jet Noise : 2nd Report, Effect of Shear on the Noise of a Jet
Bulletin of JSME, 1965 Considering the structure of turbulence in the mixing region of jets where the noise is mostly generated, the influence of the exit velocity profile (shear) on the jet-noise has been studied with the following results. Weakening the strength of shear makes the spectrum of the noise source per unit volume shift towards the lower frequency side.
Susumu KOTAKE, Takuro OKAZAKI
openaire +2 more sources
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
Technologies for jet noise reduction in turbofan engines
Aviation, 2012 Turbofan engines are commonly used for commercial transport due to their advantages of higher performance and lower noise. Jet noise is one of the principal noise sources of turbofan aeroplane engines and remains an acute environmental problem that ...
Mofid Gorji-Bandpy, Mohammadreza Azimi
doaj +1 more source