水平及倾斜管道内螺旋流压降特性研究

Study on Pressure Drop Characteristics of Spiral Flow in Horizontal and Inclined Pipeline

为了考察自转式螺旋扭带诱导生成单相螺旋管流的流动压降规律,对水平及倾斜管道内液体单相螺旋管流的压降特性进行试验研究。试验管段采用长2 m、内径25 mm的有机玻璃管,采用高分子材料螺旋扭带,扭率分别为6.2、7.4和8.8。试验介质为蒸馏水,液相流速为0.0~3.0 m/s,试验管道倾斜角0°~15°。研究结果表明:液相流速、扭带扭率及管道倾斜角对试验段的进出口压力和管道压降均有较大影响;随液相流速和扭带扭率增大,管道进出口压力均呈增大趋势;管道倾斜角仅对出口压力有影响,对进口压力影响较小;管道压降随液相流速、扭带扭率及倾斜角增大而增加。根据试验数据,以Darcy-Weisbach公式为基础,回归了适合液体单相螺旋管流的压降计算模型。

To investigate the influence of the single phase spiral flow generated by the twisted tape on the pressure drop of the pipeline,the pressure drop variation law of the single phase spiral flow in horizontal and inclined pipeline has been experimentally studied using the designed gas-liquid two phase flow test platform. The experimental section of the pipeline is made of organic glass tube with the length of 2 m and diameter of 25 mm. The twisted tape is made of high polymer material with the twist ratio of 6. 2,7. 4 and 8. 8 respectively. The test medium is distilled water with the liquid flow rate 0. 0 ~ 3. 0 m / s,test pipe inclination angle range of 0° ~ 15°. The test results show that the liquid flow rate,the twist ratio and the pipe inclination angle have great influence on the inlet and outlet pressure and the pipeline pressure drop of the test section. With the increase of liquid flow rate and the increase of twist ratio of the twisted tape,the inlet and outlet pressure of pipe increase. The inclination angle of pipeline only influences the outlet pressure and has little effect on the inlet pressure. The pressure drop of the pipe increases with the increase of the liquid flow rate,the twist ratio and the inclination angle. Based on Darcy-Weisbach formula,the pressure drop calculation model for single phase liquid spiral flow has been regressed using the test data.