Results 71 to 80 of about 228,844 (310)
Reseach on the reduction of rocket motor jet noise by water injection
MATEC Web of Conferences, 2016 Injecting water in the mixing layer of rocket motor jets is a means to reduce jet noise. The calculation of the sound pressure signals at the prescribed receivers was performed by FW-H acoustics model under the condition of water injection and without ...
Zou Hao, Xu Yi Hua, Li Yu Lin
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The objectives of this chapter are to review and summarize the jet noise suppression technology, to provide a physical and theoretical model to explain the measured jet noise suppression characteristics of different concepts, and to provide a set of ...
Brausch, J. F. +3 more
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Freeform Fabrication of Layered Halide Perovskite Nanowire Heterojunctions
Advanced Materials, EarlyView.‘All‐at‐once’ freeform fabrication of layered perovskite nanowire heterojunctions is realized by 3D printing employing meniscus‐guided crystallization. The integration of nanoscale additive manufacturing with layered halide perovskites will provide a versatile platform to freely design and realize highly stable perovskite‐based optoelectronic ...
Sixi Cao +8 more
wiley +1 more source
The Journal of the Acoustical Society of America, 1962 This paper reviews the various basic concepts the suppression of jet noise through engine or nozzle design. The significant features of each concept are discussed in terms of simple jet-flow models which enable prediction of the noise-generation characteristics of the resulting jet flows.
openaire +1 more source
Resonant Domain Wall Dynamics in a Three‐Dimensional Magnetic Nano Double Helix
Advanced Materials, EarlyView.3D magnetic nanostructures promise exciting possibilities for magnetization dynamics. However, experimental realizations remain scarce. In nanoprinted cobalt double helices, time‐resolved X‐ray microscopy reveals harmonic domain wall dynamics. Simulations identify the mode and additional higher‐frequency resonances, revealing a rich dynamic landscape ...
Pamela Morales‐Fernández +15 more
wiley +1 more source
Study on noise reduction of pump-jet propulsors based on porous media stator leading edges
Zhongguo Jianchuan YanjiuObjectiveTo suppress hydrodynamic noise at the source, a noise reduction method for pump-jet propulsors based on porous media is proposed.MethodsBy replacing the metallic leading edges of the stator blades of the pump-jet propulsor with porous materials,
Jianguo ZHENG, Hao WEN, Yijun MAO
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Jet Noise Prediction Comparisons with Scale Model Tests and Learjet Flyover Data [PDF]
Recent interest in commercial supersonic flight has highlighted the need to accurately predict Effective Perceived Noise Levels (EPNL) for aircraft and, since the dominant noise source at takeoff will likely be jet noise, specifically jet noise ...
Berton, Jeff +2 more
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Evaluation of jet engine noise [PDF]
, 1972 Three basic equations, acoustic mode and two Mach modes, characterize jet noise environments.
Pao, S. P.
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Advanced Materials Technologies, EarlyView.Liquid metal direct writing is advanced from a technological and fundamental point. Utilizing a kinematic bed, printing on large surfaces with irregularities is enabled. Furthermore, a pressure‐driven flow during printing is discovered that affects the thickness of traces.
Maximilian Krack +15 more
wiley +1 more source
Journal of Applied Fluid Mechanics, 2019 In the present paper, noise generation due to supersonic hot jet impingement (M=1.4 and Tt=950 K) to an inclined flat plate is experimentally investigated. In general, four types of acoustic waves are defined for jet impingement: acoustic waves generated
I. Bahman Jahromi +2 more
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