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Effect of loading level and axial distribution on uncertainty performance of turbine blade with geometric variations

机译:Effect of loading level and axial distribution on uncertainty performance of turbine blade with geometric variations

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摘要

Uncertainty aerodynamic design of turbine blades considering the uncertainty impact of geometric variations is significant for the robustness of actual performance. The effect of loading level and its axial distribution on the uncertainty performance of a turbine blade was discussed, and the guidance for the uncertainty loading design was derived. It is demonstrated that the uncertainty impact on the performance is always notable and nonlinear, which is mainly caused by the significant geometric variations in the sensitive areas where the flow state is sensitive to local geometric variations, and the high loading in these areas will aggravate this impact. The nonlinearity means that the damage to performance caused by those harmful geometric variations cannot be offset by the opposite ones, and the loss increases overall. This impact increases parabolically with the increase of loading level, and will be enlarged clearly with an obvious front-loading or aft-loading. Fortunately, modest aft-loading/mid-loading has a great capacity to resist this uncertainty impact, for the relieving of loading in the sensitive areas, and the negative correlation between the profile loss caused by separation and the wake mixing loss. Considering the overall uncertainty performance, a modest mid-loading/aft-loading design is optimal for high/moderate loading levels, respectively. It is proved that reasonable loading distribution can improve the actual uncertainty performance of turbine blades, which provide a powerful support for the consequent uncertainty design.

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