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LES OF TURBULENT FLOW AND MIXING IN A MICRO CAN COMBUSTOR

Hang Seok Choi
Combustion and Environment Group, Eco-Machinery Engineering Department, Korea Institute of Machinery and Materials, 171 Jang-dong, Yuseong-gu, Daejeon, 305-343, South Korea

Tae Seon Park
School of Mechanical Engineering, Kyungpook National University, 1370 Sangyeok-Dong, Buk-gu, Daegu, 702-701, South Korea

Kenjiro Suzuki
Department of Mechanical Engineering, Kyoto University, Kyoto; Department of Machinery and Control Systems, Shibaura Institute of Technology, 307 Fukasaku, Saitama, 337-8570, Japan

Abstract

Turbulence and mixing in a micro can type combustor are investigated by means of Large Eddy Simulation (LES). Attention is paid for a combustor with a baffle plate having oxidant injection and fuel injection holes and study is made for three cases of different baffle plate configurations. From the result, it is confirmed that mixing is promoted by interaction between the jets and large vortical flow regions generated between the jets and wall downstream of the fuel jet. This is effective to accelerate the slow mixing between fuel and oxidant suffering from low Reynolds number in a micro combustor. In particular, the vortical flow region ahead of fuel jet front plays an important role for rapid mixing. Discussion is made for the time and space averaged mixedness parameter which shows peculiar characteristics corresponding to different vortical flow structures for each baffle plate shapes.