Experimental Investigation of Screech-Tone Characteristics of Jet Interaction with a Flat Plate
The screech-tone characteristics of an underexpanded jet in the vicinity of a flat plate in which the jet is emitted from a circular sonic nozzle and interacts with a flat plate placed parallel to the jet axis have been investigated experimentally. The flowis visualized using the schlieren technique...
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| Veröffentlicht in: | AIAA journal 2009-09, Vol.47 (9), p.2031-2038 |
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| container_issue | 9 |
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| container_title | AIAA journal |
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| creator | Ibrahim, Mohammed K Sawai, Takashi Obase, Kimihito Mori, Koichi Nakamura, Yoshiaki |
| description | The screech-tone characteristics of an underexpanded jet in the vicinity of a flat plate in which the jet is emitted from a circular sonic nozzle and interacts with a flat plate placed parallel to the jet axis have been investigated experimentally. The flowis visualized using the schlieren technique, and the unsteady pressure on the flat plate as well as the sound pressure level in the far field are measured for different jet-plate separation distances. It is found that screech tone vanishes when the flat plate comes close to the jet axis. However, there is an azimuthal directivity in its propagation, which depends on jet-plate separation distance. In addition, the highly oscillating baseline jet flow is suppressed by the jet-plate interaction, and screech tone completely disappears when the jet-plate separation distance becomes less than 0.61 of the jet diameter. [PUBLICATION ABSTRACT] |
| doi_str_mv | 10.2514/1.37077 |
| format | Article |
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The flowis visualized using the schlieren technique, and the unsteady pressure on the flat plate as well as the sound pressure level in the far field are measured for different jet-plate separation distances. It is found that screech tone vanishes when the flat plate comes close to the jet axis. However, there is an azimuthal directivity in its propagation, which depends on jet-plate separation distance. In addition, the highly oscillating baseline jet flow is suppressed by the jet-plate interaction, and screech tone completely disappears when the jet-plate separation distance becomes less than 0.61 of the jet diameter. 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The flowis visualized using the schlieren technique, and the unsteady pressure on the flat plate as well as the sound pressure level in the far field are measured for different jet-plate separation distances. It is found that screech tone vanishes when the flat plate comes close to the jet axis. However, there is an azimuthal directivity in its propagation, which depends on jet-plate separation distance. In addition, the highly oscillating baseline jet flow is suppressed by the jet-plate interaction, and screech tone completely disappears when the jet-plate separation distance becomes less than 0.61 of the jet diameter. 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| source | Alma/SFX Local Collection |
| subjects | Acoustics Aeroacoustics, atmospheric sound Aerodynamics Air flow Aircraft Exact sciences and technology Experiments Fluid dynamics Fundamental areas of phenomenology (including applications) Instrumentation for fluid dynamics Measurement Noise (turbulence generated) Physics Turbulent flows, convection, and heat transfer |
| title | Experimental Investigation of Screech-Tone Characteristics of Jet Interaction with a Flat Plate |
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