机动管线充气排液过程中油-气体两相流阻力特性

doi:10.3969/j.issn.1000-1093.2021.04.023

摘要/Abstract

摘要： 机动管线是油料保障的骨干装备，充气排液是管线使用的一项常规作业，随着液体被排出管线，管内液体处于变加速直线运动状态，整个管路的阻力表现出非线性特征，与单相管流有很大区别。掌握管线充气排液过程的阻力特性，可以为管线排空工艺设计提供理论依据，为此提出一种适用于该过程阻力计算的简化模型。该管路分为3段，即单相气体段、单相液体段和气体-液体混合段，通过分别计算每一段的摩擦阻力而得到整个管路阻力特性，将简化模型的计算结果与机动管线充气排液多种工况的实验数据进行比较，并采用误差绝对平均值对模型计算准确性进行分析。结果表明：在排液过程的前2/3时间段内计算结果与实验数据吻合较好，在后面1/3时间段内，管内阻力以气体与液体两相流为主，计算值与实验值有一定的误差，误差来自对于段塞频率的估计和加速压降的影响；管内阻力影响最大的是油品物性，如黏度、密度、表面张力等，而管路内径、管线长度、气体流量的影响较小；阻力模型计算结果与实验结果吻合较好，可用于机动管线充气排液过程中阻力特性分析和预测。

关键词: 机动管线, 充气排液, 油-气体两相流, 阻力物性, 段塞流

Abstract: Mobile pipeline plays a great role in the oil supply，and the the pipe evacuation is a regular working. The length of the sections varies with the liquid expelled from the pipeline, and the liquid acceleration is variable, so the resistance of the pipiline system exhibits nonlinear characteristics, which shows more difference against the single phase flow. In order to provide the theoretical basis for the evacuation design, the resistance of pipeline must be accurately predicted. A calculation model is presented for the resistance characteristics in the process of pipeline evacuation. In the proposed model, a pipeline is divided into three sections, including a single-phase gas section, a single-phase liquid section, and a two-phase flow section. The resistance characteristics of the whole pipeline are obtained by calculating the friction resistance of each section. By comparing with the experimental data of various working conditions of mobile pipeline evacuation operation, the calculated result of the proposed model has a good agreement with the experimental data in the first 2/3 time period of evacuation process. In the later 1/3 time period, the resistance of pipeline is mainly caused by gas-liquid two-phase flow, so there are some errors among the calculated values and the experimental values, which may be caused by the estimation of slug frequency and the accelerated pressure drop. The calculation accuracy of the proposed model is analyzed by using the absolute mean value of error. The obvious influential factor is the physical properties of oil products, such as viscosity, density, surface tension, etc., while the influences of pipe diameter, pipe length and gas flow rate are small. The calculated results of the proposed model have a good agreement with the experimental results. The proposed model can be used for the analysis and prediction of the resistance characteristics during the mobile pipeline evacuation operation.

Key words: mobilepipeline, evacuationbygas, oil-gastwo-phaseflow, resistancecharacteristics, slugflow

中图分类号:

E234

姜俊泽，张镇，李江，陈雁，陈明，蒋苇. 机动管线充气排液过程中油-气体两相流阻力特性[J]. 兵工学报, 2021, 42(4): 888-896.

JIANG Junze, ZHANG Zhen, LI Jiang, CHEN Yan, CHEN Ming, JIANG Wei. Resistance Characteristics of Oil-gas Two-phase Flow for Mobile Pipeline Evacuation Operation[J]. Acta Armamentarii, 2021, 42(4): 888-896.

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