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Manipulation of large-scale vortical structures and mixing in a coaxial jet with miniature jet actuators

Yu Saiki
Department of Mechanical Engineering, The University of Tokyo, Japan; Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

S. Tanaka
Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

S. Hattori
Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

K. Nakura
Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Yojiro Ishino
Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Abstract

Manipulation of large-scale vortices and associated mixing in a methane-air coaxial jet is carried out by using miniature jet actuators installed on the inner surface of the annular nozzle. It is found that intense vortex rings are produced in synchronization with the periodic radial miniature jet injections regardless of the control frequency fv examined. When the Strouhal number Stv, which is defined with fv, is larger than unity, the vortex rings are densely shed and the mixing is prompted with low periodic fluctuation. The diameter of the vortices becomes small as Stv is increased, so that transport range of the two fluids can be controlled by changing Stv. In addition, evolutions of counter-rotating streamwise vortex pairs are also observed. These vortices are formed as a result of the miniature jet injection, which leads to entrainment of the ambient fluids. They contribute to the mixing enhancement in the downstream region.

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