ON THE RELATIONSHIP BETWEEN LARGE-SCALE VORTICAL STRUCTURES AND SCALAR TRANSPORT PROCESSES IN A CONTROLLED CONFINED COAXIAL JET

Akihiko Mitsuishi; Koji Fukagata; Nobuhide Kasagi

doi:10.1615/TSFP4.1410

Fourth International Symposium on Turbulence and Shear Flow Phenomena

June, 27-29, 2005, Marriot Hotel, Williamsburg, Virginia, USA

DOI: 10.1615/TSFP4

ON THE RELATIONSHIP BETWEEN LARGE-SCALE VORTICAL STRUCTURES AND SCALAR TRANSPORT PROCESSES IN A CONTROLLED CONFINED COAXIAL JET

pages 841-846

DOI: 10.1615/TSFP4.1410

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Akihiko Mitsuishi
Department of Mechanical Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, JAPAN; Toyohashi University of Technology, Hibarigaoka 1-1, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan; Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588, Japan

Koji Fukagata
Department of Mechanical Engineering, Keio University, Hiyoshi 3-14-1, Kohoku-ku, Yokohama 223-8522,Japan

Nobuhide Kasagi
Center for Research and Development Strategy, Japan Science and Technology Agency; Department of Mechanical Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

要約

We carry out direct numerical simulation (DNS) of scalar transport and mixing in a coaxial jet issued into a small model combustor. Analysis is made on the detailed mechanism of mixing enhancement achieved by an active control of the near-field large-scale vortical structures. The main interest lies in the relationship between these vortical structures and associated scalar transport processes in the near field downstream of the nozzle exit. From the phase-averaged statistics, the mechanism of mixing enhancement is revealed in the case of the best mixing achieved.

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ISSN オンライン: 2375-0294

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