In addition, it is shown that impellers optimized at design point may not have good acoustic performances at off design point.

此外，还指出在设计流量下优化的叶轮不一定在非设计工况下也有良好的声学性能。

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In Francis turbines operating off design point the influence of vortex cavitation is considerable yet not quantitatively known.

以设计点为动力来运转轴向幅流叶轮机，涡空化的影响相当的大但无法用数据表示。

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You'll be able to point people to the documentation so that they can see exactly what your design means to them, and you'll never be caught off guard when someone challenges your design decisions.

您能够指示人们参考该文档，以便他们可以确切看到您的设计对他们意味着什么，并且您决不会在某人挑战您的设计决策时失去警惕。

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