颗粒浓度对含颗粒油液动态特性的影响

Effect of Particle Concentration on Dynamic Characteristics of Oil Containing Particles

为了控制油液中颗粒物,降低对设备运行的危害,基于液固两相流的连续介质理论建立了含悬浮颗粒油液的伪均质流数学模型,研究悬浮颗粒油液的动态特性;利用所建模型对不同颗粒浓度情况下油液的速度、压力以及颗粒物的速度、浓度分布进行分析.研究结果表明,特征线法求解结果与实验数据吻合较好;油液速度、压力的跃变幅值随着颗粒浓度增大而减小,颗粒速度、浓度随着浓度的增大而增大;颗粒浓度分布受油液压力影响较大;伪均质流在管路始端、中段、终端发生跃变时刻分别为1/4脉动周期的奇数倍、1/8脉动周期的奇数倍和1/4脉动周期的偶数倍.

To reduce the damage caused by particulate matter to equipment operation and to effectively control the particle concentration in oil, the pseudo-homogeneousz-flow mathematical model of suspended particles in oil was established using the continuum theory of liquid-solid two-phase flow. The dynamic characteristics of the oil containing particles were studied; the oil velocity and pressure and the distribution of particle velocity and concentration were analysed for varying particle concentration using the model. The results showed a good agreement between the experimental data and the results attained by the characteristic line method. The jump amplitude value of oil velocity and pressure decreases with increase in particle concentration; however, the jump amplitude value of particle velocity and concentration increases with increase in particle concentration. The distribution of particle concentration is substantially influenced by the oil pressure. The jump moments of the pseudo-homogeneous flow velocity and pressure take place are 1/4 pulsating period odd times , 1/8 pulsating period odd number and 1/4 pulsating period even times, respectively, at the beginning, middle, and end of the pipeline.