impeller balance hole
... impellent 推动物；推的 impeller balance hole 叶轮平衡孔 impeller blasting 抛丸除锈 ...
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关于叶轮平衡孔的存在对级性能的影响，通过两种方案的试验，概论了其漏气对级效率的影响。
Through the two different designed experiments of the leak-out flow of the balance holes, its influence to the stage efficiency is presented which gives reference for the design.
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