Discrete Frequency Noise From Lifting FansSource: Journal of Engineering for Gas Turbines and Power:;1971:;volume( 093 ):;issue: 004::page 431Author:A. N. Abdelhamid
DOI: 10.1115/1.3445603Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Discrete frequency noise characteristics of a research lifting fan is investigated analytically. Based on steady aerodynamic data of the fan, unsteady aerodynamic forces acting on the rotor and stator blades were calculated using the results of previous investigators and an analysis which determines the effect of fluctuating velocity disturbance parallel to blade chord on the unsteady lift of cambered thin airfoils. The calculated unsteady forces were then used to determine the characteristics of discrete frequency noise emission from the fan. For the fan under consideration it is shown that the rotor interaction noise dominates the fan noise. Comparison between the predicted sound pressure levels and experimental observations shows good agreement. Based on the calculated detailed contributions of the different force harmonics acting on the blades to the fan noise, possible means of reducing lifting fan noise are discussed.
keyword(s): Noise (Sound) , Fans , Blades , Force , Rotors , Aerodynamics , Sound pressure , Chords (Trusses) , Stators , Emissions AND Airfoils ,
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| contributor author | A. N. Abdelhamid | |
| date accessioned | 2017-05-09T00:56:08Z | |
| date available | 2017-05-09T00:56:08Z | |
| date copyright | October, 1971 | |
| date issued | 1971 | |
| identifier issn | 1528-8919 | |
| identifier other | JETPEZ-26696#431_1.pdf | |
| identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/150834 | |
| description abstract | Discrete frequency noise characteristics of a research lifting fan is investigated analytically. Based on steady aerodynamic data of the fan, unsteady aerodynamic forces acting on the rotor and stator blades were calculated using the results of previous investigators and an analysis which determines the effect of fluctuating velocity disturbance parallel to blade chord on the unsteady lift of cambered thin airfoils. The calculated unsteady forces were then used to determine the characteristics of discrete frequency noise emission from the fan. For the fan under consideration it is shown that the rotor interaction noise dominates the fan noise. Comparison between the predicted sound pressure levels and experimental observations shows good agreement. Based on the calculated detailed contributions of the different force harmonics acting on the blades to the fan noise, possible means of reducing lifting fan noise are discussed. | |
| publisher | The American Society of Mechanical Engineers (ASME) | |
| title | Discrete Frequency Noise From Lifting Fans | |
| type | Journal Paper | |
| journal volume | 93 | |
| journal issue | 4 | |
| journal title | Journal of Engineering for Gas Turbines and Power | |
| identifier doi | 10.1115/1.3445603 | |
| journal fristpage | 431 | |
| journal lastpage | 440 | |
| identifier eissn | 0742-4795 | |
| keywords | Noise (Sound) | |
| keywords | Fans | |
| keywords | Blades | |
| keywords | Force | |
| keywords | Rotors | |
| keywords | Aerodynamics | |
| keywords | Sound pressure | |
| keywords | Chords (Trusses) | |
| keywords | Stators | |
| keywords | Emissions AND Airfoils | |
| tree | Journal of Engineering for Gas Turbines and Power:;1971:;volume( 093 ):;issue: 004 | |
| contenttype | Fulltext |