Transient Pig Motion Through Non-Isothermal Gas and Liquid Pipelines
Transient Pig Motion Through Non-Isothermal Gas and Liquid Pipelines
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DOI：
10.1115/ipc2000-175
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发表时间：
2000-10
期刊：
影响因子：
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通讯作者：
A. Nieckele;A. Braga;L. F. Azevedo
中科院分区：
文献类型：
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作者：
A. Nieckele;A. Braga;L. F. Azevedo
对清管器在非等温管道中运动的动力学进行了模拟。采用有限差分数值方法，对可压缩管道流动的质量、动量和能量微分方程进行数值求解。流体流动方程与代表清管器上力平衡的方程相结合。考虑了由于清管器中的旁通孔的流动而产生的压力、清管器加速度和清管器/管道接触力。开发了粘滑模型，以说明取决于清管器是否停止或运动的不同摩擦机制。采用自适应网格技术来考虑移动的清管器。向环境的热损失在流体温度分布中起着重要作用。然而，对于所进行的试验情况，温度变化实际上对清管器动力学没有影响。
Simulation of the dynamics of pigs moving through non-isothermal pipelines is presented. The differential mass, linear momentum and energy equations were numerically solved by a finite difference numerical scheme, for compressible flow through pipelines. The fluid flow equations were combined with an equation representing a force balance on the pig. Pressure forces developed due to flow through by-pass holes in the pig, pig acceleration and pig/pipe contact forces were considered. A stick/slip model was developed to account for the distinct friction regimes that prevail depending on whether the pig is stopped or in motion. An adaptive grid technique was employed to account for the moving pig. Heat losses to the ambient play an important role in the fluid temperature distribution. However, for the test cases conducted, the temperature variations caused virtually no effect on the pig dynamics.Copyright © 2000 by ASME