超高負荷タービン翼列内の流れの数値解析(流体工学,流体機械)

概要

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The increase of blade loading of turbine cascade makes it possible to reduce the number of blades and stages, and consequently to decrease both the weights and the costs for manufacturing and maintenance. However, the strong secondary flow appears in such highly loaded turbine cascades due to the high turning angles and reduces the turbine efficiencies. In the present study, the two and the three dimensional calculations were performed for the flows within the three types of ultra highly loaded turbine cascades, which have different length along the suction surface with each other. The increase of the length of suction surface results in the increase of the maximum thickness of blade. The computed results showed that the decrease of the length of suction surface reduced the profile loss, but increased the secondary flow loss. The two peaks apeared in the streamwise distribution of the secondary flow kinetic energy by increasing the length of suction surface.
2004-09-25