Numerical simulation of the effect of export structure on the performance of axial flow cyclone separator
The structure parameter of the axial flow cyclone separator has a significant impact on its performance,but the impact of the export structure of the axial flow cyclone separator is still unclear.This paper studies the effects of different export structures on the flow resistance and separation performance of axial flow cyclone separators by numerical simulation.Four export structures are designed:the traditional cylindrical export,the wedge-shaped export,the arc-shaped export,and the mixed export.The large eddy simulation method is used for the gas phase,and the Euler-Lagrange method is used for the particle phase to simulate the internal flow field distribution and separation efficiency of the axial flow cyclone separator.The reliability of the numerical method is verified by comparing the pressure drop and separation efficiency with experimental results.The results show that in the flow field of axial cyclone separators,inter-blade passage vortexes form at the suction surface of the blade,and wake vortexes form at the bottom of the guide cone.The internal pressure of the vortex is low,and the velocity gradient is large.The particles are sucked to the center of the vortex core,which has adverse effects on the flow resistance and separation efficiency.Compare axial flow cyclone separators with cylinder export,wedge-shaped export and arc-shaped export,wedge-shaped and arc-shaped export aggravate the breaking of vortex structure in the export pipe,with better flow resistance than cylindrical export.In addition,the arc-shaped export makes the dust removal channel narrow quickly,which causes less separation efficiency than wedge-shaped export.To further improve the flow resistance and separation performance of axial flow cyclone separators with arc-shaped export,a straight section is designed above the arc-shaped export to slow the expansion of the profile.This work reduces the pressure loss and also improves the separation eficiency of axial flow cyclone separators.Therefore,the axial flow cyclone separators with wedge-shaped export and mixed export have the best performance.A reasonable export structure is key to achieving lower flow resistance and higher separation efficiency of the axial flow cyclone separator.
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