Aerodynamic performance of a 1.35-pressure-ratio axial-flow fan stage [PDF]
The overall blade element performances and the aerodynamic design parameters are presented for a 1.35-pressure-ratio fan stage. The fan stage was designed for a weight flow of 32.7 kilograms per second and a tip speed of 302.8 meters per second.
Moore, R. D. +2 more
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Turbofan noise generation. Volume 1: Analysis [PDF]
Computer programs were developed which calculate the in-duct acoustic modes excited by a fan/stator stae operating at subsonic tip speed. Three noise source mechanisms are included: (1) sound generated by the rotor blades interacting with turbulence ...
Mark, W. D. +2 more
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imulation of the flow in the fan stage of a turbofan engine with annular grooves casing treatment
Авіаційно-космічна техніка та технологіяThe subject of this study is the working process of the axial fan under the annular groove casing treatment of the turbofan engine. The object of the present study is to investigate the fan impeller of a turbofan engine subjected to an annular groove ...
Andrii Duliepov, Anton Balalaiev
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A Peak Absorption Filtering Method for Radiated EMI from a High-Speed PWM Fan
Applied SciencesAxial flow fans are widely used for heat dissipation in electronic devices. Due to its frequent speed-regulation to adapt to the change in heat load, a fan can cause significant electromagnetic radiation interference.
Jinsheng Yang +4 more
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Overall and blade element performance of a 1.20 pressure ratio fan stage with rotor blades reset -7 deg [PDF]
A 51-cm-diam model of a fan stage for short haul aircraft was tested in a single stage compressor research facility. The rotor blades were set 7 deg toward the axial direction (opened) from the design setting angle.
Kovich, G., Lewis, G. W., Jr.
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Assessment of Oscillating Wings to Deliver Air Mass Flow Under Power and Thrust Constraints
AerospaceAn oscillating wing was evaluated for its ability to deliver air mass flow. The evaluation was based on exploring the oscillation parameters that provide a given mass flow rate at the least power requirement with the highest possible thrust generation ...
Emin Burak Ozyilmaz, Mustafa Kaya
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Investigations of detail design issues for the high speed acoustic wind tunnel using a 60th scale model tunnel. Part 2: Tests with the closed circuit [PDF]
This report summarizes the tests on the 1:60 scale model of the High Speed Acoustic Wind Tunnel (HSAWT) performed during the period June - August 1991. Throughout the testing the tunnel was operated in the 'closed circuit mode,' that is when the airflow ...
Barna, P. Stephen
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Comparison of the noise characteristics of two low pressure ratio fans with a high throat Mach number inlet [PDF]
Acoustics data obtained in experiments with two low pressure ratio 50.8 cm (20 in.) diameter model fans differing in design tip speed were compared.
Abbott, J. M. +2 more
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Performance of a highly loaded two stage axial-flow fan [PDF]
A two-stage axial-flow fan with a tip speed of 1450 ft/sec (442 m/sec) and an overall pressure ratio of 2.8 was designed, built, and tested. At design speed and pressure ratio, the measured flow matched the design value of 184.2 lbm/sec (83.55kg/sec ...
Benser, W. A., Ruggeri, R. S.
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Forward acoustic performance of a model turbofan designed for a high specific flow (QF-14) [PDF]
Forward noise and overall aerodynamic performance are presented for a high-tip-speed fan having an exceptionally high average axial Mach number at the rotor inlet.
Lucas, J. G. +2 more
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