Results 21 to 30 of about 1,354,747 (243)
Noise control for high subsonic jet flows by inner wall treatment
Advances in Aerodynamics, 2023 Subsonic jet nozzles, commonly used in passenger aircrafts, generate significant noise that travels both downstream and upstream due to large-scale or fine-scale turbulence in the jet plume.
Huyue Mao +4 more
doaj +1 more source
Journal of Fluid Science and Technology, 2014 Jet powered aircraft radiate a substantial amount of noise around airports. Among several noise sources of the aircraft, high-speed jet behind the nozzles of jet engines generates strong sound through mixing process of jet with the surrounding flow.
Tatsuya ISHII +3 more
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Diagnosis of three types damages to the ventilation system
Diagnostyka, 2022 The article is devoted to solving of urgent problem to eliminate damage in ventilation system. That is caused by non-adequate long range, stagnant unventilated areas in the room existance and high noise level in the premises at air distribution by ...
Orest Voznyak +5 more
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Jet noise from instability mode interactions [PDF]
, 2008 A nonlinear interaction model is used to study sources of sound in jets. The model uses quadratic interactions of instability modes, which are obtained by solving the linear parabolized stability equations.
Salgado, Adriana M. +2 more
core +3 more sources
Zhongguo Jianchuan Yanjiu, 2017 [Objectives] In order to study the underwater jet noise characteristics,[Methods] the Lighthill acoustic analogy is carried out to compute the underwater free jet flow sound field characteristic of axisymmetric nozzle, with applying of FLUENT simulation ...
XING Junhua +3 more
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Prediction of Aircraft Surface Noise in Supersonic Cruise State
Aerospace, 2023 The aerodynamic noise of an aircraft leads to vibration fatigue damage to structures. Herein, a prediction method for aircraft surface noise under the comprehensive effect of mixed acoustic sources during flight, primarily surface aerodynamic, air intake,
Xiaoguang Zhang, Huixue Dang, Bin Li
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Survey of Semi-Empirical Jet Noise Models for Preliminary Aircraft Engine Design
Aerospace, 2023 Scientific research studies on jet noise generation have been ongoing since the early 1950s, when turbojets were first used in commercial aircraft. Several numerical methods have been developed with the aim of reducing the environmental issues related to
Francesco Petrosino, Mattia Barbarino
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Noise-silencing technology for upright venting pipe jet noise
Advances in Mechanical Engineering, 2018 When a natural gas transmission and distribution station performs a planned or emergency venting operation, the jet noise produced by the natural gas venting pipe can have an intensity as high as 110 dB, thereby severely affecting the production and ...
Enbin Liu, Shanbi Peng, Tiaowei Yang
doaj +1 more source
How to satisfy the takeoff noise requirements for a supersonic transport [PDF]
, 1987 The noise during takeoff of a supersonic transport is calculated for the flyover and the lateral reference noise measurement points defined by ICAO Annex 16. Only the contribution of jet mixing noise is considered.
Michel, Ulf, ULF MICHEL
core +1 more source
Use of dual planar jets for the reduction of flow-induced noise
AIP Advances, 2017 The planar jet has been proposed to reduce the flow-induced noise. However, the self-noise emission from a single planar jet is a limiting factor on the performance based characteristics of this technology.
Kun Zhao +4 more
doaj +1 more source