The RDZ consists of a reduced diameter tube section mating to a specially-shaped ceramic tile.

RDZ包含了一个与异形瓷砖搭配的直径方向缩减的管道截面。

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Section water ring: prevent concentration in the peripheral Settings, seepage, to change the direction of flow, increasing permeability diameter, reduce the seepage.

截水环：防止集中渗流，在外围设置，以改变水流方向，增加渗径，减小渗流。

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Set the height of accelerating section and decelerating section, ratio of pipe-diameter as alterable parameter, the mathematic model of structure optimization was established.

将加速段、减速段高度及其管径比作为可变参数，建立了结构优化数学模型。

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