CAJ | 학술논문

给出气液两相流数学模型,选取Cross-WLF模型作为熔体的黏度模型,采用Level Set /SIMPLEC方法模拟了气体辅助注射成型中气体穿透过程,追踪到了不同时刻的运动界面(气熔界面和熔体前沿界面),描述了运动过程中不同时刻速度和温度等重要物理量的分布情况,分析了熔体温度、气体延迟时间和注射压力对气体穿透时间和穿透长度的影响.数值结果表明,Level Set /SIMPLEC方法可以准确追踪气体穿透过程中的两个运动界面;熔体温度、延迟时间和气体注射压力对气体穿透长度有显著影响.
급출기액량상류수학모형,선취Cross-WLF모형작위용체적점도모형,채용Level Set /SIMPLEC방법모의료기체보조주사성형중기체천투과정,추종도료불동시각적운동계면(기용계면화용체전연계면),묘술료운동과정중불동시각속도화온도등중요물리량적분포정황,분석료용체온도、기체연지시간화주사압력대기체천투시간화천투장도적영향.수치결과표명,Level Set /SIMPLEC방법가이준학추종기체천투과정중적량개운동계면;용체온도、연지시간화기체주사압력대기체천투장도유현저영향.
The mathematical models of gas-liquid two-phase flow were presented, and the Cross-WLF model was selected as the viscosity model of the melt.The gas penetration process was simulated by using the Level Set /SIMPLEC methods, which could capture the moving interfaces at different times, including the gas-melt interface and the front of the melt.The physical features, such as velocity and temperature at different times were described.The influences of melt temperature, gas delay time and injection pressure on gas penetration time and penetration length were analyzed.The numerical results showed that the Level Set/SIMPLEC methods could precisely trace the two moving interfaces in the gas penetration process and the penetration length was affected significantly by melt temperature, gas delay time and injection pressure.