水平管气液衰减螺旋流的流型及压降发展

doi:10.3901/JME.2020.20.214

摘要/Abstract

摘要： 气液衰减螺旋流在工业中应用广泛,但是对其中的关键问题,衰减影响下的螺旋流发展运动规律认识不清。通过室内试验研究空气-水两相流在内径25 mm、长4 m的水平管中流型和压降沿流向的变化规律。通过可视化试验获得叶片式起旋器下游不同位置处的螺旋流流型,测量下游沿流向不同区间的压降波动信号。试验发现,在离心力作用下,螺旋流中气液相界面发生重构,形成螺旋流中特有流型。但是由于离心力的衰减,导致螺旋流流型不断变化,逐渐转变成非旋流流型。流动压降沿流向逐渐降低,最终趋于非旋流压降;不同螺旋流流型的维持距离不同,同时也受来流气液相雷诺数的影响。基于流型及压降分析,获得起旋器下游不同位置处的螺旋流流型图。

关键词: 气液两相, 螺旋流, 流型, 压降, 衰减

Abstract: Gas-liquid decayed swirl flow is widely used in industrial fields, however, the key problem, the effect of decay on the development of flow characteristics in the swirl flow, is unclear. Axial development of flow pattern and pressure drop in an air-water two-phase flow in a horizontal tube with an inner diameter of 25 mm and a length of 4 m is studied by experiment. The swirl flow patterns at different regions downstream of the vane type swirler are studied by visualization experiment, and the pressure drop fluctuation signals in different regions along the streamwise direction are measured. The results show that under the effect of centrifugal force, gas-liquid phase interface in the swirl flow is reconstructed, leading to the formation of special swirling flow patterns. However, due to the swirl decay, swirl flow patterns change continuously, and it gradually transform to non-swirl flow pattern. The pressure drop in the swirl flow gradually decreases along the streamwise, and finally approximates to the pressure drop in a non-swirl flow. Different swirl flow patterns have different maintenance distances, and the distance is affected by the flow rate upstream of the swirler. Finally, according to the analysis of flow pattern and pressure drop signals, the flow pattern maps at different regions in the horizontal swirl flow are proposed.

Key words: gas-liquid two-phase, swirl flow, flow pattern, pressure drop, decay

中图分类号:

TH172

刘雯, 李华峥, 王雪, 王树立. 水平管气液衰减螺旋流的流型及压降发展[J]. 机械工程学报, 2020, 56(20): 214-222.

LIU Wen, LI Huazheng, WANG Xue, WANG Shuli. Development of Flow Pattern and Pressure Drop in Gas-liquid Swirl Flow inside Horizontal Pipe[J]. Journal of Mechanical Engineering, 2020, 56(20): 214-222.

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