Effect of External Cyclone Diameter on Performanceof a Two-Stage Cyclone Separator

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Asa widely used separation device, a cyclone separator is especiallyimportant to improve its separation efficiency. In this paper, a newtwo-stage cyclone separator is designed and modeled by the Reynoldsstress model. Under the premise of determining the diameter of thesecond-stage cyclone (D), the effects of five first-stage cyclonediameters (Du) on the performance of the two-stage cyclone are simulated.The performance of the single-stage cyclone separator is also obtained.The results show that Du has significant effects on the internal pressurefield, flow field, and vortex core of the two-stage cyclone. Comparedwith the single-stage cyclone separator, the separation efficiencyof the two-stage cyclone separator is significantly improved. WhenDu = 6D, the separation efficiency is improved by 15.5% compared withthat of the single-stage cyclone. In addition, the two-stage cycloneseparator can effectively reduce the Euler number.