Study of the Internal Cyclonic Flow Characteristics of Cyclones with Different Guide Vane Heights
Abstract
:1. Introduction
2. Construction of a Mathematical Model of Guide Vane Cyclones
2.1. Geometric Modelling
2.2. Mesh Division
2.3. Model Selection and Its Control Equations
3. Research Programme
4. Experimental Verification of Simulation Results
5. Simulation Results and Analysis
5.1. Analysis of the Internal Tangential Velocity Characteristics of Cyclones with Different Guide Vane Heights
5.2. Analysis of the Internal Radial Velocity Characteristics of Cyclones with Different Guide Vane Heights
5.3. Analysis of the Internal Axial Velocity Characteristics of Cyclones with Different Guide Vane Heights
6. Discussion and Conclusions
- The tangential velocity in the centre of the cyclone pipe is mainly in the anticlockwise direction, and the flow velocity increases with the increase in the guide vane height and then decreases. When the ratio between the height of the guide vane and the inner diameter of the cyclone is in the range of 0.5 to 0.7, it can produce a high−strength and more stable spiral flow. When the height of the guide vane is 30 mm and the height−to−diameter ratio is near 0.6, the tangential velocity reaches its maximum and the intensity of the spiral flow generated is the highest, which enables more particle of different sizes to enter the suspended flow at this time and provides a better sand removal effect.
- The radial velocity increases as the height of the guide vane increases, and the radial velocity region pointing towards the tube wall increases, while the radial velocity region pointing towards the tube axis decreases.
- The overall distribution of axial flow velocity is similar to that of turbulent flow in a circular tube. The axial flow velocity inside the cyclone increases gradually along the course due to the influence of the water−retaining area of the guide vane and increases accordingly when the height of the guide vane increases.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
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Computational Models | Advantages | Disadvantages |
---|---|---|
Standard k-ε | Wide range of application, economic and reasonable, with high accuracy; its convergence and calculation accuracy can meet general engineering calculation requirements; suitable for design selection and parameter study. | Poor simulation of complex flows with high curvature and sharp changes in pressure gradients; deficiencies in the simulation of cyclonic and bypass flows. |
RNG k-ε | Moderately complex flows, such as separation flows, secondary flows and cyclonic flows, can be simulated for complex shear flows involving fast strains and moderate vortices. | The strong cyclonic processes cannot be predicted due to the limitations of the vortex viscous homogeneity assumption. |
Realisable k-ε | Similar to the RNG, the calculation is more accurate than the RNG and allows for better simulation of circular jets. | Strong cyclonic processes cannot be predicted due to the limitations of the vortex viscous homogeneity assumption. Turbulent eddy viscosity coefficients are strain rate dependent and therefore less efficient to calculate. |
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Tao, S.; Li, Y.; Song, X.; Zhang, J. Study of the Internal Cyclonic Flow Characteristics of Cyclones with Different Guide Vane Heights. Water 2023, 15, 78. https://doi.org/10.3390/w15010078
Tao S, Li Y, Song X, Zhang J. Study of the Internal Cyclonic Flow Characteristics of Cyclones with Different Guide Vane Heights. Water. 2023; 15(1):78. https://doi.org/10.3390/w15010078
Chicago/Turabian StyleTao, Siyuan, Yongye Li, Xiaoteng Song, and Jiaxuan Zhang. 2023. "Study of the Internal Cyclonic Flow Characteristics of Cyclones with Different Guide Vane Heights" Water 15, no. 1: 78. https://doi.org/10.3390/w15010078
APA StyleTao, S., Li, Y., Song, X., & Zhang, J. (2023). Study of the Internal Cyclonic Flow Characteristics of Cyclones with Different Guide Vane Heights. Water, 15(1), 78. https://doi.org/10.3390/w15010078