椭圆边非弯折织物渗透率预测公式的研究

RESEARCH ON PERMEABILITY PREDICTING FORMULA OF NON-CRIMPED FABRICS WITH FIBERS OF ELLIPSE EDGE

将NCF的纤维束两侧近似为半椭圆,对NCF单胞设计五因素五水平正交试验,利用CFD方法得到渗透率的数值结果,进而拟合出预测渗透率的椭圆边公式。对于纤维束四方排列的NCF单胞,椭圆边公式的计算结果和数值结果平均误差为1.91%;对于六方排列,平均误差为1.90%。对NCF渗透率的预测结果和实验结果的相对误差为0.22%,小于矩形边公式的误差3.96%。当束间间距w1与椭圆边的半长轴c1之比小于0.8时,两预测公式值之比大于1.1。说明椭圆边公式对NCF材料渗透率的预测更加准确,适用范围更广。

The results of CFD（ Computational Fluid Dynamics） were applied to fit the ellipse edge formula for predicting permeability of NCF while the edge of fibers was approximated as semi-ellipse. Orthogonal tests of 5 factors and 5 levels were carried out on the NCF unit cell. The average error between numerical and the ellipse edge formula＇s results is 1. 91% for quadratic arrangement and 1. 90% for hexagonal arrangement. The error between experimental and the ellipse edge formula＇s result is 0. 22%,which is smaller than the error of 3. 96% between experimental and the rectangle edge formula＇ s result. The ratio between the result of ellipse edge formula and rectangle edge formula is over 1. 1,when the ratio between the width W1 between fiber bundles and the major semi-axis c1 of ellipse edge is less than 0. 8. The results verified that the ellipse edge formula was more accurate and the application was broader.