sc-CO2在GFRP中的渗透模型及其数值模拟

摘要

受成型工艺和材料属性的限制,GFRP(Glass Fiber Reinforced Plastics)在表面和内部存在一定数量的孔隙,导致管材输送超临界CO2( sc-CO2 )时受到流体渗透和扩散的作用而性能降低.为研究不同工况下介质在GFRP中的渗透行为,本文建立了sc-CO2在GFRP中渗透扩散的多孔介质模型,运用计算机流体力学软件FLUENT模拟了sc-CO2在GFRP中的渗透行为,通过控制粘性阻力系数和惯性阻力,研究了渗透深度随时间变化的规律,以及温度和压强对sc-CO2在GFRP中的渗透速度影响规律.结果表明:不同渗透阻力系数下,sc-CO2在GFRP中的渗透速度相差较大,但其渗透深度的变化趋势基本一致,即渗透速度只有量的差异,没有质的区别;随温度的升高,sc-CO2的渗透速率降低;随压强的升高, sc-CO2渗透速率显著增加.%Due to the limitation of the processing technique and the materials feature, there usually exist numerous pores in Glass Fiber Reinforced Plastics ( GFRP ) , which will reduce the performance in transfer supercritical CO2 ( sc-CO2 ) . The porous media model has been established to simulate the penetration behaviors of sc-CO2 in different conditions by the software FLUENT. The penetration depth as a function of the time, and the effect of the temperature and pressure on the penetration rate of sc-CO2 in GFRP have been studied by controlling both viscous and inertial resistance coefficient in this work. The result shows that the penetration rate of sc-CO2 varies considerably with coefficientsThe penetration rate decreases with the increase in the temperature and dramatically increases with the increase inthe pressure.