# Analysis of Cyclone Spinning Effect with Different Guide Vane Heights
## 1 Introduction
[PERSON] [18] and others studied the heat transfer characteristics of decaying swirls in concentric circular pipes and provided a formula for calculating the decay rate of vortices[PERSON] [PERSON] [19] developed a propeller-type vortex generation device and conducted numerical simulation studies on the heat transfer and flow characteristics of liquids in the pipeline. The selection of different structural parameters of the swirler has a significant impact on the flow field characteristics of the spiral flow generated; therefore, people have conducted a large number of studies on the structural parameters of the swirler. [PERSON] [20] and others numerically simulated the flow field inside a spiral flow swirler, analyzing the distribution rules of velocity field, pressure field, and vorticity field under different guide vane lengths. [PERSON] [21] and others used a self-circulating experimental device to study the flow velocity distribution characteristics of swirlers with different guide vane angles, concluding that when the guide vane angle is \(15^{\circ}\), the water flow conditions are better. [PERSON] [22; 23] and others analyzed the spiral flow produced by swirlers with different aspect ratios of guide vanes during operation, and they derived the size and distribution of the velocity field and vorticity field at the downstream section of the swirler. [PERSON] [24] and [PERSON] [25], respectively, studied the three-dimensional velocity distribution rules and along-pipeline change rules at the downstream section of the swirler, analyzing the intensity and influence range of spiral flow generated by swirlers with different guide vane wrap angles. [PERSON] [26] and others studied the influence of the change in guide vane height on the performance of the cyclone, analyzed the distribution law of circumferential velocity, and found that when the ratio of the guide vane height to the inner radius of the cyclone was 0.5-0.7, the spiral flow intensity was higher and more stable. It can be seen that the selection of guide vane parameters ina swirler directly affects the effect of circular pipe spiral flow transportation, and reasonable parameter values can effectively improve the sediment transport efficiency of the swirler. At present, the research on the guide vane parameters ofcyclones mainly includes the guide vane length, placement angle, diameter-to-length ratio, and envelope angle, and most of the relevant research results focus on the analysis of the flow field characteristics of the cyclone; there are few targeted studies on the mechanical efficiency of cyclones. In this paper, on the basis of the great results achieved by [PERSON] et al. in studying the influence of guide vane height change on the flow field characteristics of cyclones, the influence of different guide vane height changes on the mechanical efficiency of a cyclone is studied, which is an effective supplement to the study of cyclone guide vane parameters and provides a reference for optimizing the cyclone structural parameters. The research results of this paper will provide an important theoretical and data reference for the practical engineering of pipeline particle transportation, such as river pipelines filled with sediment and industrial fluid transportation systems, and how to improve the efficiency of pipeline transportation.