Velocity characteristics of spiral flow in downstream section of guide vane cyclone
LI Yongye1, GAO Yuan1, JIA Xiaomeng1, LU Yifan1, SUN Xihuan1*, ZHANG Xuelan1, LI Jintao2
1. College of Water Resource Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China; 2. Shanxi Electric Power Engineering Co., Ltd., China Energy Engineering Group, Taiyuan, Shanxi 030001, China
Abstract：Spiral flow in the pipe can realize high concentration and low velocity of solid transport. As a device for generating spiral flow, the velocity characteristics of spiral flow in the downstream section of the cyclone were studied by combining theoretical analysis and model test. The results showed that the flow velocity of the downstream section of the cyclone presented a symmetrical distribution of 120° about the pipe center. From the wall to the center of the pipe, the axial velocity of the downstream section of the cyclone increased gradually, while the circumferential velocity and radial velocity both increased first and then decreased. The maximum axial velocity was located at the center of the pipe section, the maximum circumferential velocity was about 1cm away from the pipe wall, and the maximum radial velocity was about 2cm away from the pipe wall. The larger the torsion angle of the guide blade of the cyclone, the greater the circumferential velocity of the spiral flow generated in the downstream section, the greater the intensity of the spiral flow, and the farther the influence distance of the spiral flow. Before 2m away from the trailing edge of the guide blade of the cyclone, the spiral flow decayed faster, and the larger the torsion angle of the guide blade of the cyclone, the faster the spiral flow decayed. The results can provide a theoretical basis to further improve the spiral flow transport theory.
