J051012 蒸気タービン部分流入段フランジ近傍流れの三次元数値解析([J05101]流体機械の研究開発におけるEFD/CFD(1))

概要

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In a steam turbine partial admission stage, particular losses and lift fluctuations occur even under a full load condition because the working steam isn't supplied to the rotor raw around flanges. Unsteady three-dimensional flows in a partial admission stage are numerically investigated and compared with the result of two-dimensional analysis. A numerical method developed by authers' group is used in this study. Then, the lift fluctuations in the three-dimentional analysis is in good agreement with that of two-dimentional analysis, but the local flactuations are lower than that of two-dimentional analysis. The pressure distributions of three-dimensional analysis show lower flactuation too. The cause of this difference may be due to radial flows which equalize the flow field. Finally, the radial flow affects the rotor performance.
一般社団法人日本機械学会の論文
2011-09-11