定义 径向叶轮或混流叶轮的后盖板上（顺着流体流动方向看过去）的一个径向力的狭窄的叶片，该叶片用来平衡轴向推力。
当它获得充裕的阳光时，株型会趋于更矮小和紧凑，叶片呈现出更加鲜艳的色彩，尤其是叶背紫色的一面。
When it receives sun it tends to stay smaller and more compact and the leaves exhibit a much more intense colouring - especially on the purple undersides of the leaf.
汽轮机叶片制造中，叶片叶型的内弧、背弧形状通常是使用样板来检验的。
Inner arc and carry arc of the blade have been tested by the model in processing steam turbine blade.
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