G0501-6-6 蒸気タービン3次元空力設計翼に関する研究(回転機械)

概要

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Recently, fully three dimensional design method is applied to the blades of almost stages in the steam turbine. However, detailed mechanism of three dimensional effects on the flow within a turbine cascade has not been clear completely in spite of many studies for a long time. Therefore, turbine designer has to pay careful attention to the blade stacking using the blade leaning technology. In order to blush up the fully three dimensional design method, the authors have reviewed the complicated flow pattern within a bowed blade in detail through the cascade testing and CFD, and have proposed a new idea to improve conventional bowed blade. In conclusion, the reason for increasing in profile loss at mid span and decreasing in secondary loss near the endwall of conventional bowed blade has been explained, and a effect of the throat expansion at mid span as a new technology on reducing the losses in the bowed blade has been verified by experiment.
2009-09-12