Unsteady two-dimensional flows in a steam turbine partial admission stage are numerically investigated using a CFD method developed by the authors. First, the flows through 54 nozzle and 30 rotor channels with a simple flange are calculated and the effect of the flange width on the rotor performance is predicted. Numerical results indicate that the reduction of flange thickness basically improves the operating efficiency and reduces the fluctuation of fluid force. Next, flange geometry with a sloped side wall is employed as considering a real design configuration and the flow is calculated. Finally, we discuss how the geometry is effective to reduce the fluctuation of fluid force and to improve the operating efficiency.
|ジャーナル||Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B|
|出版ステータス||Published - 2012|
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