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ISSN オンライン: 2642-0554

AN EXPERIMENTAL APPROACH TO VORTEX-FLAME INTERACTION USING COHERENT STRUCTURE IN A PREMIXED PLANE SHEAR LAYER

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

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

Shigeki Yamaguchi
Department of Transport Machine Engineering, Meijo University 1-501, Shiogamaguchi, Tempaku-ku, Nagoya 468-8502, Japan

要約

The vortex-flame interaction is examined experimentally by using turbulent premixed flames propagating in the well-known plane shear layer. The shear layer is established between the higher- and lower-velocity mixture streams of 5.0 m/s and 2.5 m/s, respectively, and is acoustically excited by a speaker at a fundamental frequency of 452.5 Hz, in order to augment the periodicity of the organized eddy formation. A stoichiometric propane-air flame is stabilized behind a rod flame holder of 1 mm diameter, so that a rod-stabilized flame can propagate along the axes of organized eddies.
Optical observations using schlieren photography and velocity measurement using PTV are made on the rod-stabilized flame. The setting conditions of the shear layer indicate that turbulence generated is subdivided into the moderate one having a relatively large scale and a rather weak intensity. However, the proportionality constant between the enhancement rate of the burning velocity and the vortex strength exhibits a slight larger value of (ST/SL)/(Vθ/SL) =1.5 than those obtained using a single vortex tube or a single vortex ring. It is found that the mutual interaction among neighboring eddies exerts non-negligible influence on the vortex-flame interaction.