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Sound generation from vortex pairing in subsonic coaxial jets

Jiang, X; Avital, E; Luo, KH; (2003) Sound generation from vortex pairing in subsonic coaxial jets. In: (pp. pp. 3875-3882).

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Abstract

Direct numerical simulation (DNS) and an acoustic analogy were used to investigate the sound generation by vortex pairing in subsonic coaxial jets. The detailed sound source structure was provided by the DNS. The acoustic analogy was based on solving the non-linearized Lilley's third-order wave equation in the time-space domain. A numerical algorithm for solving Lilley's equation was developed, in which the sound field was simulated simultaneously with the source field calculation. The computational domain included both the near field and a portion of the acoustic far field. Effects of a coaxial secondary jet stream on the sound generation from a subsonic axisymmetric jet were investigated. It was shown that the sound source has a long axial distribution in the streamwise direction with the strongest source located near the end of the jet potential core where vortex pairing/merging occurred, and the radiated sound field is highly directive. It was also found that the secondary jet stream reduces the sound source size, therefore the sound radiation from the coaxial jets is lower than that from the single jet. For the predicted sound field, a reasonable agreement was observed between the predictions from the axisymmetric Lilley's equation and the DNS results.

Type: Proceedings paper
Title: Sound generation from vortex pairing in subsonic coaxial jets
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/1401479
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