Under the same impeller outlet speed, the flow speed of blade diffuser is faster than the vaneless one. The average flow field at impeller outlet trends to uniform.

在相同叶轮出口速度下，叶片扩压器比无叶扩压器中气流速度下降迅速，叶轮出口处平均流场趋于均匀。

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Sharp blade key: hand must keep horizontal motion, force must be uniform and owner. on back must be straight or round straight, nearly edge department can not have a little hunchback.

刀刃锋利的关键所在：手必须保持水平运动，力必须均匀，刀背必须保持平直或圆直，近刃口部不得有一点驼背。

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Flatness, bevels, and finishes are to be uniform. Blade surfaces must be free from scratches.

平面、斜角及抛光是一个统一体，刀的表面不得有划痕。

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One challenge is to ensure that the application is uniform and without bubbles or dry areas which would result in ensuing weakness of the blade.

FORBES: Offshore Wind: Enormous Potential, Huge Challenges