Results 71 to 80 of about 404,526 (210)
Efficiency of tandem UAV propulsion fans with toroidal-helical connected blade tips
Авіаційно-космічна техніка та технологіяUnmanned Aerial Vehicles (UAVs) are increasingly in demand for both civilian and military missions. This has become especially evident during combat operations against the Russian Federation’s occupying forces, where battlefield advantages have been ...
Mykola Kulyk +3 more
doaj +1 more source
Recent results about fan noise: Its generation, radiation and suppression [PDF]
Fan noise including its generation, radiation characteristics, and suppression by acoustic treatment is studied. In fan noise generation, results from engine and fan experiments, using inflow control measures to suppress noise sources related to inflow ...
Feiler, C. E.
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Acoustic evaluation of a novel swept-rotor fan [PDF]
Inlet noise and aerodynamic performance are presented for a high tip speed fan designed with rotor blade leading edge sweep that gives a subsonic component of inlet Mach number normal to the edge at all radii. The intent of the design was to minimize the
Lucas, J. G. +2 more
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, 2012 published_or_final_version ; Mechanical Engineering ; Master ; Master of ...
openaire +2 more sources
Noise and wake structure measurements in a subsonic tip speed fan [PDF]
The results of an experimental program are reported which show the effect of blade angle, tip speed, fan pressure ratio, and thrust on noise of a model fan of 0.457m (18 inches) diameter operating at subsonic tip speeds at pressure ratios between 1.06 ...
Hanson, D. B. +3 more
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Analytical study of the effects of wind tunnel turbulence on turbofan rotor noise [PDF]
The influence of tunnel turbulence on turbofan rotor noise was carried out to evaluate the effectiveness of the NASA Ames 40 by 80 foot tunnel in simulating flight levels of fan noise.
Gliebe, P. R., Kerschen, E. J.
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Elliptical side resonators for broadband noise reduction: theory and experiments [PDF]
, 2006 Previous research of the authors pointed out that side-resonators can be applied to reduce fan noise. However, the noise reduction capabilities of most resonator geometries, e.g.
Boer, A. de +2 more
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Advanced turbo-prop airplane interior noise reduction-source definition [PDF]
Acoustic pressure amplitudes and phases were measured in model scale on the surface of a rigid semicylinder mounted in an acoustically treated wind tunnel near a prop-fan (an advanced turboprop with many swept blades) model.
Brooks, B. M., Magliozzi, B.
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Measured and predicted noise of the Avco-Lycoming YF-102 turbofan noise [PDF]
Acoustic testing of the AVCO-Lycoming YF-102 turbofan engine was done on a static test stand in support of the quiet short-haul research aircraft acoustic design.
Clark, B. J., Homyak, L., Mcardle, J. G.
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Broadband sound radiated from subsonic rotors [PDF]
Recent theoretical work on sound sources in subsonic turbomachinery is applied to the correlation of axial-flow fan and compressor noise measurements. Correlations are presented for directivity and sound-power spectra associated with broadband noise.
Morfey, C. L.
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