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| Characteristics of annulus moving boundary flow in straight pipe segments of different widths |
| ZHANG Xue-Lan, Sun-Xi-Huan, Li-Yong-Ye |
| (College of Water Resource and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China) |
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Abstract To further explore the influence of different factors on the hydraulic characteristics of the moving boundary annulus flow, through tests and theoretical analyses, annuluses with widths of 25,20,15,10 mm respectively were studied. The test was carried out in the straight pipe segment of the pipeline system, whose control volume is 60 m3/h, using barreled feed pipe carriage weighted 750 g. The research shows that the moving boundary annulus flow in straight pipe segment is turbulent morphology. Pressure values of measurement points in the annulus cross section tend to cluster as the width of the annulus increases. In the same section, pressure around the moving boundary of carriage is lower and pressure around the fixed pipe wall is higher. With the same width, the axial velocity sectional distribution is more uniform in the middle section than in the back or front. And the distribution is a layered one around the carriage body of which higher around the dynamic boundary and lower around the fixed border. When the width is 20mm, the axial distribution uniformity is best. Circumferential velocity shows uneven distribution in sections along the carriage under various conditions of different annulus widths.
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Received: 11 August 2012
Published: 30 April 2013
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