The results indicate that the most increment of pump assembly efficiency is 9.85% by adjusting blade angle.
结果表明：实施变角经济运行后，泵装置效率最高可提高9.85%；
The results are significant for decreasing hydraulic loss of discharge passage, pump assembly optimum design and increasing pump assembly efficiency.
成果对减小出水流道水力损失，实现泵装置优化设计，提高泵装置效率有重大意义。
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