发动机进口流场等值线极坐标绘图法

整个绘图系统分三层。第一层包括(MA-INLA, MAINLB等子程序)的圆上或环上插值曲面计算;第二层包括(PLOTWA, MAPLIN子程序)的极坐标下矩形网格(即扇形网格)棱边与等值线的交点计算;第三层把等值线与棱边的交点绘成平面上折线和光滑曲线。一、二层是平行关系,第三层是由第二层调用。具体结构见图。

A CONTOUR LINE PLOTTING SYSTEM W|TH POLAR COORDINATES FOR AEROENGINE INLET FLOW FIELD

Three interpolating surface algorithms, i.e. bilinear, biquadratic and circular spline function radial parabolic algorithms,are provided in this programming system. The last of them is considered to be the most ideal one for interpolating surface because it has high accuracy,truly expresses the distorted flow field,and overcomes the unsmoothed joints of the biquadratic algorithm. In order to determine the intersection points between contour and network,rectangular grids of polar coordinates instead of rectangular coordinates are used. In result, many advantages for engine inlet flow field plotting can thus be achieved. This programming system can save computer time and reduce costs.