Large Eddy Simulation of Flow Field in Hydrocyclone with Air Core
To gain a deeper understanding of the flow characteristics of hydrocyclones and the dynamic evolution process of the air core,this paper conducts numerical simulation research on the flow field inside the hydrocyclone based on large eddy simulation(LES)and volume of fluid(VOF)model by using software Fluent.The results show that the velocity distribution of the flow field inside the hydrocyclone follows a Rankine vortex structure,with higher intensity of turbulent fluctuation in the central region and lower intensity of fluctuation in the outer vortex region.Tangential velocity and pressure fluctuations reach the maximum at the junction of the quasi-free vortex and the quasi-forced vortex,and axial velocity fluctuations reach the maximum near the axis.Pressure fluctuations in the central region are very small,and external pressure fluctuations are greater than those in the central region.Due to the low pressure,the air is inhaled into the center of the hydrocyclone,and an air core is formed.The air core undergoes quasi-periodic coherent processing motion around the axis of the hydrocyclone and results in irregular changes in the gas-liquid interface,which has a significant impact on the turbulence characteristics inside the hydrocyclone.The research results will lay the foundation for analyzing the separation efficiency and energy consumption,and designing a new type of cyclone.
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