In order to further explore the effects of different guide strip angles on hydraulic characteristics of moving boundary annular gap flow of piped carriage, through model tests and theoretical analyses, the guide strips with angles of 10°, 15°, 20° and 25° respectively were studied. The test section was located within the straight pipeline of test system, whose control volume was 40 m3/h, using the loadings of the piped carriage 600 g. The results showed that, with the increase of the angles of the guide strip, the maximum value of the axial flow velocity and the circumferential flow velocity increased gradually, the maximum value of the radial velocity decreased gradually, and the pressure increased first and then decreased. With the same guide strips angles, the circumferential velocity and radial velocity of the annular gap flow of the piped carriage lc×dc=100 mm×70 mm (lc was the length of the barrel, dc was the diameter of the barrel) were the largest among three types of the piped carriages, and the axial velocity and pressure of the annular gap flow of the piped carriage lc×dc=150 mm×60 mm were the largest among three types of the piped carriages. The hydraulic characteristics of the annular gap flow of the piped carriage existed mainly in the nearwall areas of the flow field on both sides of guide strips. The study of this paper will enrich the annular gap flow theories and provide a theoretical basis for the design of guide strips.
ZHANG Chun-Jin,SUN Xi-Huan,LI Yong-Ye et al. Effects of guide strip angles on hydraulic characteristics of moving boundary annular gap flow[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(2): 136-141.