# Analysis of Cyclone Spinning Effect with Different Guide Vane Heights
## 6 Conclusions  
In this paper, the spinning effects of five different guide vane height cyclones under four different Reynolds number conditions were studied, and the conclusions are as follows:  
(1) In the upstream of the guide vane section and the straight section of the guide vane inside the cyclone, the rotational kinetic energy of the water flow passing through the other sections per unit time except for the leading edge section of the guide vane was almost zero. The rotational kinetic energy of the water flow passing through the water section of the twisted section of the cyclone guide vane increased along the unit time. The rotational kinetic energy of the water flow downstream of the guide vane decreased along the way.  
(2) At the leading and trailing edges of the guide vanes of the cyclone, the local mechanical energy loss increased with the increase in the guide vane height. In the guide vane section of the cyclone, the mechanical energy loss of the water flow along the way was almost constant, and the higher the height of the guide vane, the faster the mechanical energy loss of the cyclone. Part of the pressure energy in the mechanical energy of the water flow was converted into kinetic energy through the deflection of the guide vane, and the higher the height of the guide vane, the greater the growth of the kinetic energy of the cyclone, and the greater the mechanical energy consumed in the conversion process.  
(3) The additional mechanical energy loss when the water flow passed through the cyclone increased with the increase in the guide vane height, and the proportion of the total mechanical energy loss increased with the increase in the Reynolds number Re. The proportion of additional mechanical energy loss in the total mechanical energy loss was more affected by the height of the guide vane than by the Reynolds number. The mechanical efficiency of the cyclone \(\eta\) decreased as the guide vane height increased. When the Reynolds number increased, the mechanical efficiency \(\eta\) increased slightly.  
(4) When it was necessary to produce a relatively large intensity spiral flow at a small pipeline water velocity, a guide vane with a larger height could be selected, but there would be a greater loss of additional mechanical energy. When it was necessary to produce a higher intensity spiral flow with less additional mechanical energy loss, a cyclone with a lower guide vane height could be selected. Moreover, when the relative height of the guide vane H/R \(>\) 0.7, the spiral flow intensity did not increase significantly, but the additional mechanical energy loss increased significantly, so it is not recommended.  
(5) The research content of this paper will provide an important reference for the practical engineering of pipeline particle transportation such as for sediment-filled river pipelines and industrial fluid transportation systems in order to improve the transportation efficiency of pipelines.  
Data curation, X.S.; formal analysis, S.W.; funding acquisition, Y.L.; investigation, X.S.; resources, S.T.; validation, S.T.; supervision, Y.L.; writing--original draft, S.W.; writing--review and editing, Y.L. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the National Natural Science Foundation of China (Grant No. 51179116) and the Natural Science Foundation of Shanxi Province (Grant No. 202303021211141).  
Not applicable.  
This research was supported by the Secure and Efficient Operation of Long-Distance Water Transfer Project at Taiyuan University of Technology.