对比数值模拟结果，优化后有效地改善了叶栅流道中的流动状况，级性能有了显著的提高。
After optimization, the flow field in cascade passage is effectively improved, and the performance of stage is improved obviously.
对比数值模拟结果，优化后有效地改善了叶栅流道中的流动状况，级性能有了显著的提高。
After optimization, the flow field in cascade passage is effectively improved, and the performance of stage is improved obviously.
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