An experimental investigation of the sources of propeller noise due to the ingestion of turbulence at low speeds
Noise radiation from a four bladed, 10 in. diameter propeller operating in air at a rotational speed of 3000 RPM and a freestream velocity of 33 ft/s was experimentally analyzed using hot-wire and microphone measurements in an anechoic wind tunnel. Turbulence levels from 0.2 to 5.5 percent at the pr...
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| Veröffentlicht in: | Experiments in fluids 1995-02, Vol.18 (4), p.277-286 |
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| container_title | Experiments in fluids |
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| creator | SCHARPF, D. F MUELLER, T. J |
| description | Noise radiation from a four bladed, 10 in. diameter propeller operating in air at a rotational speed of 3000 RPM and a freestream velocity of 33 ft/s was experimentally analyzed using hot-wire and microphone measurements in an anechoic wind tunnel. Turbulence levels from 0.2 to 5.5 percent at the propeller location were generated by square-mesh grids upstream of the propeller. Autobicoherence measurements behind the blade trailing edges near the hub and tip showed regions of high phase-coherence between the blade-passage harmonics and the broadband frequencies. Inflow turbulence reduced this coherence. By relating the fluctuation velocities in the propeller wake to the unsteady blade forces, the primary regions of tonal noise generation have been identified as the hub and tip regions, while the midspan has been identified as a region responsible for broadband noise generation. (Author) |
| doi_str_mv | 10.1007/BF00195098 |
| format | Article |
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By relating the fluctuation velocities in the propeller wake to the unsteady blade forces, the primary regions of tonal noise generation have been identified as the hub and tip regions, while the midspan has been identified as a region responsible for broadband noise generation. (Author)</description><subject>Acoustics</subject><subject>Aeroacoustics and atmospheric sound</subject><subject>Aeroacoustics, atmospheric sound</subject><subject>Exact sciences and technology</subject><subject>Fundamental areas of phenomenology (including applications)</subject><subject>Noise: its effects and control</subject><subject>Physics</subject><issn>0723-4864</issn><issn>1432-1114</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1995</creationdate><recordtype>article</recordtype><recordid>eNpFkE1LAzEQhoMoWKsXf0EO4kFYzXc2xypWhYIXPS8xna2RbbImu378e1Nb9DQMPO_wzIvQKSWXlBB9dT0nhBpJTL2HJlRwVlFKxT6aEM14JWolDtFRzm-FkobUE9TPAoavHpJfQxhsh334gDz4lR18DDi2eHgFnOOYHOTN2qfYQ9dBwiH6DHg5Ah7iL-XDahPdxcb0MnYQHGA74C5-4twDLPMxOmhtl-FkN6foeX77dHNfLR7vHm5mi8qx2gwVL661abkySyUF1VyDYlJrZziriSROOKUoU62R4BxwLZyQ0oAURjDnFJ-i8-3dIvw-Fq9m7bMr5jZAHHPDNv9Trgt4sQVdijknaJu-lGHTd0NJsym1-S-1wGe7qzY727XJBufzX4ILIYzh_AdNsXYg</recordid><startdate>19950201</startdate><enddate>19950201</enddate><creator>SCHARPF, D. 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J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c289t-348689f369d6541737e62577c9328050c4c66126f95ecce374c4559e54942cc63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1995</creationdate><topic>Acoustics</topic><topic>Aeroacoustics and atmospheric sound</topic><topic>Aeroacoustics, atmospheric sound</topic><topic>Exact sciences and technology</topic><topic>Fundamental areas of phenomenology (including applications)</topic><topic>Noise: its effects and control</topic><topic>Physics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>SCHARPF, D. F</creatorcontrib><creatorcontrib>MUELLER, T. 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Autobicoherence measurements behind the blade trailing edges near the hub and tip showed regions of high phase-coherence between the blade-passage harmonics and the broadband frequencies. Inflow turbulence reduced this coherence. By relating the fluctuation velocities in the propeller wake to the unsteady blade forces, the primary regions of tonal noise generation have been identified as the hub and tip regions, while the midspan has been identified as a region responsible for broadband noise generation. (Author)</abstract><cop>Heidelberg</cop><cop>Berlin</cop><pub>Springer</pub><doi>10.1007/BF00195098</doi><tpages>10</tpages></addata></record> |
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| ispartof | Experiments in fluids, 1995-02, Vol.18 (4), p.277-286 |
| issn | 0723-4864 1432-1114 |
| language | eng |
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| source | SpringerLink Journals - AutoHoldings |
| subjects | Acoustics Aeroacoustics and atmospheric sound Aeroacoustics, atmospheric sound Exact sciences and technology Fundamental areas of phenomenology (including applications) Noise: its effects and control Physics |
| title | An experimental investigation of the sources of propeller noise due to the ingestion of turbulence at low speeds |
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