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DIRECT NUMERICAL SIMULATION OF TURBULENT REACTING JET INTRODUCING FULLY DEVELOPED TURBULENCE AT THE INLET

Shuichiro Hirai
Tokyo Institute of Technology, Department of Mechanical and Control Engineering, 2-12-2 Ookayama, Meguro-ku, Tokyo 152-8551, Japan

Masanori Takeno
Research Center for Carbon Recycling and Energy, Tokyo Institute of Technology, 2-12-1, Ohokayama, Tokyo, 152-8552, Japan

Kiyotaka Hiradate
Research Center for Carbon Recycling and Energy, Tokyo Institute of Technology, 2-12-1, Ohokayama, Tokyo, 152-8552, Japan

Аннотация

Fully developed turbulent reacting jet formed by introducing inlet condition given by a turbulent channel flow was analyzed by the data base of direct numerical simulation. We show characteristic reacting processes that product concentration increases rapidly at the region further than a distance similar to that of channel width from the jet inlet. Detailed interpretation has been made to elucidate the interactions between vortices and mixing/reaction processes. Rapid increase is mainly caused by an increase of reaction zone thickness, not its length. Cloud-like reaction zones are formed, which are related to vortices expanding toward outer regions accompanied by change of vortex structure. Counter-rotating vortices are observed in some cloud-like reaction zones where reactants intrude each other.