中文摘要：

针对某平板注塑成形过程,通过改变气体反压（Gas Counter Pressure,GCP）压力场,用ANSYS CFX模拟GCP技术对成形质量的影响.由模拟结果可知：在GCP压力作用下,熔体的流动形态发生明显变化.当GCP压力增大时,熔体的最大流动长度减少,且熔体流动速度和剪切应变速率呈下降的趋势.在充填时间内,GCP压力由0增加到2 MPa时,塑料熔体沿流动方向上的速度由0.52m/s下降到0.45 m/s,熔体的最大剪切应变速率最大降低42.7%.

英文摘要：

As to the injection molding process of a plate part,the effect of Gas Counter Pressure（ GCP）technology on the molding quality is simulated in ANSYS CFX by changing GCP pressure field. The simulation results show that the melt flow is obviously changed by the effect of GCP pressure. When the GCP pressure increases,the maximum flow length,flow velocity and shear strain rate of the melt decreases. During the injection filling stage,when the GCP pressure increases from zero to 2 MPa,the velocity of the plastic melt along flow direction decreases from 0. 52 m / s to 0. 45 m / s and the maximum reduction of the maximum shear strain rate is 42. 7%.