水平管内气液两相流影响滑脱损失的实验研究

为了探究滑脱损失在气液两相流中对压降存在的影响,从而进一步减小滑脱带来的损耗,本文通过利用多相流实验设备,采用水-空气为流动介质,对水平管条件下的气液两相流中的滑脱损失进行了实验研究。在采用杜克勒Ⅰ法无滑脱压降模型的理论基础上,结合实验所得数据,利用滑脱密度、滑脱压降和滑脱压降比三个参数分别对不同管径、不同液相表观流速以及不同气液比条件下的滑脱损失进行了分析。结果表明：在相同气体表观流速条件下,最大滑脱损失会随管径的增大而增大;当气相表观流速一定,液相表观流速越大时,滑脱损失在管线的整体压降中产生的影响越大;在液体表观流速不变,气液比改变时,可根据滑脱压降大小判断滑脱损失影响;水平管中滑脱损失变化与滑脱密度之间没有明显的关联性;水平管中段塞流型相较于层状波浪流会产生更大的滑脱损失。以上结论可为工程设计、实践提供参考。

Experimental Study of Slipage Loss of Liquid-Gas Two-Phase Flow in Horizontal Pipes

In order to explore the effect of slipage loss on the pressure drop in the gas-liquid two-phase flow and reduce it, in this paper, the Multiphase Flow Laboratory of Gas Lift Innovation Center was used to study the slippage loss in the gas-liquid two-phase flow, with the medium of air-water, under horizontal tube. Based on Dukler I"s correlations, the theory of no-slip pressure drop model,and combined with experimental data, density of slippage, pressure drop of slippage, and ratio of slippage are used to analyze the influence of slippage loss under different pipe diameters, liquid superficial velocity and gas-liquid ratio. The result shows that the maximum slippage loss will greater with the increase of pipe diameter under the fixed gas and liquid flow conditions.When the gas superficial velocity fixed, the greater the liquid superficial velocity, the greater the effect of slippage loss on the overall pressure drop of the pipeline.With the gas-liquid ratio changing, the influence of slippage loss can be judged according to the pressure drop of slippage.There is no clear relationship between slippage loss and density of slippage in horizontal pipes. And the slug flow in horizontal pipe will produce more slippage loss than laminar wave flow. The conclusions can provide reference for engineering design and practice.