基于牛顿切线法创建通风机扩散器导叶模型

Constructing the model of the entrance bucket of a fanning machine diffuser on the basis of newton tangent law

利用牛顿切线法快速、高精度地计算出通风机扩散器导叶圆弧的圆心角,通过VBA技术提供的求线段的向量角和极点坐标等方法求出圆弧圆心坐标和半径,再利用VBA中画圆弧的命令精确绘制导叶圆弧曲线。成功解决了在AutoCAD软件中高精度创建通风机扩散器导叶三维模型的困难。为通风机扩散器的虚拟设计及其内部流场数值分析奠定了基础。同时,也为AutoCAD软件提供了一种新的绘制圆弧的方法。

In order to improve the precision in constructing the model of the entrance bucket of a fanning machine diffuser in AutoCAD,Firstly,calculate the central angle of the arc of the entrance bucket based on Newton Tangent Law.Secondly,get the values coordinates of the center of the arc and the radius by applying the methods from VBA of getting the polar angle and the coordinates of the pole.Lastly,accurately draw the arc by employing the instructions of VBA.The suggested method successfully solve the difficulty in constructing 3D model of the entrance bucket in high accuracy in AutoCAD,and lays a foundation for the virtual design of the diffuser and the numerical analysis of the internal flow field.Simultaneously,it provides a new method of drawing arc for AutoCAD.