概述了平面多边形三角形剖分的各种算法，提出了一种不考虑多边形的凸凹性、顶点顺时针或逆时针走向循环消除顶点的平面多边形三角剖分算法，并给出了实例。

We have proposed an arithmetic of this kind to eliminate the vertex in a circling way, ignoring the knaggy character and the deasil or anticlockwise direction of the plane polygon.

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模拟结果表明，在L型定向风帽流化床中，颗粒存在顺时针方向的循环流动，因此床料的横向混合特性较好。

The simulation result indicates that there is clockwise particles circulation in fluidized beds with L-type wind caps.

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