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Third Symposium on Turbulence and Shear Flow Phenomena
June, 25-27, 2003, International Center, Sendai, Japan

DOI: 10.1615/TSFP3

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

pages 1001-1006
DOI: 10.1615/TSFP3.1670
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ABSTRACT

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.

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