导叶片式旋流器下游断面螺旋流流速特性

将导叶片旋流器作为产生螺旋流的装置,采用理论分析和模型试验相结合的方法,对该旋流器下游断面的螺旋流流速特性进行了研究.研究结果表明:旋流器下游断面流速整体上关于管道圆心呈120°旋转对称分布.从管壁到管道断面中心旋流器下游断面的轴向流速逐渐增大,而周向流速和径向流速则均呈现先增大后减小的变化趋势.最大轴向速度位于管道断面中心处,最大周向流速位于距管壁约1cm处,最大的径向速度位于距管壁约2cm处.旋流器导叶片扭转角越大,在下游断面产生的螺旋流的周向流速、强度就越大,螺旋流的影响距离就越远.在距离旋流器导叶片后缘2m之前,螺旋流衰减较快,且随着旋流器的导叶片扭转角的增大,螺旋流衰减加快.研究成果可为进一步完善螺旋流旋流输送理论提供理论依据.

Velocity characteristics of spiral flow in downstream section of guide vane cyclone

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.