440 高次精度LESによるタービン段落解析(OS23.計算工学およびCAEの最新応用(3),オーガナイズドセッション)

概要

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Numerical studies of 3-D incompressible viscous flow within a turbine stage based on a high order LES approach were carried out. In this work, 3-D unsteady flow was visualized to investigate the flow characteristics around the stator and rotor. Computations were carried out for quarter cycle of a turbine stage consist of 22 stator and 19 rotor blades in order to examine the unsteadiness due to the blade number difference. The visualization of the simulation results indicated that a thin vortex core was produced and a secondary vortex was formed due to the interaction with the hub wall in the stator region. These wakes were stretched toward the rotor blade. A landscape vortex at the leading edge and the large scale separation at the suction face were observed in the rotor region. The rotor wake indicated a complex 3-D structure with a roll with axis in blade height direction.
2008-11-01