数値流体解析によるタービン静翼動翼周りの流れの可視化(火力発電及び伝熱流動,<特集>第13回動力・エネルギー技術シンポジウム)

概要

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Numerical studies of 3-D incompressible viscous flow within a turbine stage based on a high order LES (Large Eddy Simulation) approach were carried out. In this work, 3-D unsteady flow was visualized to investigate the flow characteristics around the stator and the 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 secondary vortex core was formed due to the interaction with the blade surface and the hub wall in the stator region. This vortex core flowed into the rotor blade. A landscape vortex at the leading edge and a large scale separation at the suction face were observed in the rotor region. The rotor wake indicated a complex 3-D structure of rolls with axis in blade height direction.
一般社団法人日本機械学会の論文
2009-03-25