Study On The Character Of Spiral Flow Caused By Different Length Guige Vanes

For finding a steady pipe hydraulic transport method, we developed the conventional barreled material piped transportation system. A cyclone used as a closed container for materials transportation. The paper was supported by National Natural Science Foundation of "Pipeline Hydraulic Transportation Energy Consumption of Train"(51179116) and "Research on Flow Characteristics of Pipeline Spiral Slot"(51109115). And using a method combined theoretical analysis and practical research. At last, the characteristics of spiral flow were investigated, which was caused by vane with different lengths during exercise. The main results showed as follows:1. For the cyclone with the same reynolds but different vane lengths had the rule of the pressure distribution increased firstly then decrease with the increasing in guide vanes’length. When the vane length is50mm, the pressure had a minimum value. The axial velocity showed a character of decrease firstly then increased. The average axial velocity of the test cross-sectional had the maximum value, when the vane length was0.75L. The peripheral speeds had a character of increase firstly then decrease. Moreover, the maximum peripheral speed was appeared when the vane length was0.5L. The radial velocity also had trends of increase firstly then decreases at the test cross-sectional location. The radial velocity reached its maximum value when the cyclone with a0.5L length vane.2. For the same type of hydrocyclone, the larger Re, the stress of testing section and axial velocity is greater, and velocity gradient distribution is more dense. As the well, the growth rate of circumferential velocity is greater than radial velocity.3. In the same conditions and the height and the length of the vanes is the same, the pressure in the test section changed greater with the rotation angle of the vanes increases; The average axial velocity is also greater with the rotation angle of the vanes increase; When the hydrocyclone is located upstream of the test section, as the increase of the rotation angle of the hydrocyclone vanes, the circumferential velocity of the flow in the test section of the pipe is the greater, however, When the hydrocyclone is located downstream of the test section, the opposite result is obtained; The larger of the angle of rotation of the vanes, the absolute value of the radial speed of the test section is smaller.4. Overall, the performance of the axial velocity of water flow is eccentric and asymmetrical parabolic trend of the center hole in test section. Only in the vicinity of the piped wall it began to decline; and the larger of the Reynolds number, the axial velocity of typically measured hole is also increased, and the magnitude of the increase is also great. When the hydrocyclone is located upstream of the test section, the average axial speed of the typically measured hole is larger as the rotational angle of hydrocyclone is greater. When the hydrocyclone is located downstream of the test section, the result is opposite.5. In the design conditions of Re=0.8×105, the unit energy consumption of the hydrocyclone is the smallest in the whole pipeline system running when the θ=5°, h=15mm,l=L. And in the design conditions of Re=1.1×105, it was θ=5°, h=15mm,l=0.75L.The research results of the paper provide a theoretical basis for the helical flow of moving boundary theory and application in the actual production of hydrocyclone.