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  • Swirl and buoyancy effects on mixing performance of baffle-plate-type miniature confined multijet

    Author(s)
    Tatsumi, Kazuya
    Tanaka, Miyako
    Woodfield, Peter L
    Nakabe, Kazuyoshi
    Griffith University Author(s)
    Woodfield, Peter L.
    Year published
    2010
    Metadata
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    Abstract
    A three-dimensional numerical simulation was carried out to examine the effects of swirl and buoyancy-driven flows on the mixing performance of a baffle-plate-type miniature confined multijet. Swirl flow was produced by inclining the jet nozzles surrounding the central jet in the circumferential direction. The results obtained were compared with those of the non-swirl case. The swirl flow interrupted the radial secondary flow generated in the region adjacent to the baffle plate. This interruption decreased the size of the reverse flow region, resulting in a deterioration of the mixing performance. This behavior was more ...
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    A three-dimensional numerical simulation was carried out to examine the effects of swirl and buoyancy-driven flows on the mixing performance of a baffle-plate-type miniature confined multijet. Swirl flow was produced by inclining the jet nozzles surrounding the central jet in the circumferential direction. The results obtained were compared with those of the non-swirl case. The swirl flow interrupted the radial secondary flow generated in the region adjacent to the baffle plate. This interruption decreased the size of the reverse flow region, resulting in a deterioration of the mixing performance. This behavior was more noticeable in the case of a large swirl number. During the study of the buoyancy effect, the operating direction of the gravitational force was changed with respect to the central axis of the mixing chamber, i.e. the attack angles were 0ଠ90ࠡnd 180஠The buoyancy effect was negligible when the operating direction was parallel to the chamber axis. However, when the attack angle was 90ଠasymmetric distributions of mixture fraction and flow velocity were obtained, and the mixing performance was found to be poor. In the swirl-accompanied cases, the effect of buoyancy force was apparent even when the operating direction was parallel to the central axis. The swirl flow, which reduced the secondary flow effects of the reverse and radial flows, tended to increase the effect of the buoyancy force on the multijet flow. On the other hand, the swirl flow prevented the mixture fraction distribution to be asymmetric in the case of buoyancy with 90ࠡttack angle. These tendencies became more conspicuous for flows with stronger swirl.
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    Journal Title
    International Journal of Heat and Fluid Flow
    Volume
    31
    Issue
    1
    DOI
    https://doi.org/10.1016/j.ijheatfluidflow.2009.09.005
    Subject
    Aerospace engineering
    Mechanical engineering
    Energy generation, conversion and storage (excl. chemical and electrical)
    Publication URI
    http://hdl.handle.net/10072/36130
    Collection
    • Journal articles

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