Permeability prediction for textile preform with micro-meso dual-scale unit cell

A mathematical model for resin flow was established, the geometry model close to the real unit cell structure was built based on the principle of minimum potential energy. The influence of yarn crimp and extrusion on micro-permeability was studied and the numerical method for solving the resin flow control equations based on finite difference method was built, the pressure and velocity distribution of the flow were computed to predict the permeability of preform. The prediction results were compared with literature and experimental values to verify the prediction model and the solving method mentioned above.