含颗粒污染物的油液均质流的数值分析

Numerical analysis for pseudo homogeneous flow of particle/oil

含颗粒污染物的油液是浓度很稀、粒径极小的伪均质流,为了掌握颗粒污染物在输送过程中的浓度分布,利用一维扩散方程构建了污染油液的数学模型;通过特征线法数值求解,获得了污染油液中各相的动态特征。结果表明,油液压力和速度沿管长呈脉动规律运动,且随着时间的延长逐渐衰减;颗粒污染物对油液速度具有极好的跟随特性;颗粒污染物的浓度分布也随着油液流速的变化而呈现规律性的变化;在不同运行时间内油液压力沿管长的衰减趋势不同,油液速度沿管长的变化趋势与压力的趋势相反;颗粒污染物速度和浓度分布沿管长与油液速度具有紧密的联系。

In order to know well concentration distribution of the particle pollutants in an oil transport process,contaminated oil is regarded as a pseudo homogeneous flow including very dilute concentrations of particle pollutants,whose size is tiny,a numerical framework for contaminated oil is proposed based on one-dimensional diffusion equation.A numerical simulation through characteristic line method,the dynamic characteristics of each phase in the contaminated oil were obtained.The results show that the oil pressure and speed along the transport pipe length undergo regular fluctuation,and gradually decay with time;velocity of particle pollutants in oil largely follows oil velocity;particle concentration distribution forms a pattern with the change of oil flow velocity;oil pressure attenuation trend in different time periods is different along with the pipe length,the tendency of the oil velocity is opposite to the trend of pressure along the pipe length;particle pollutants velocity,concentration distribution as well as velocity of the oil along the tube length are closely related.