Design And Numerical Simulation Of Dynamic Pressure Oil-gas Separator And Centrifugal Ventilator

Dynamic pressure separator is a mechanical device which can separate mixed immiscible two-phase, with centrifugal force, gravity and density difference of two-phase.The flow field inside the dynamic pressure separator is a complex three-dimensional rotation which is a two-phase flow problem.Base on the theoretical analysis, this paper established equations of motion of bubbles and oil droplets inside the flow field of the dynamic pressure separator, and obtained the trajectories of bubbles and oil droplets.With VC++programming software, programed a module to calculate separable minimum particle diameter, separative efficiency and minimum separator length.This paper also applied universal computational fluid dynamics software FLUENT to do some numerical simulations about flow field and separation performances of dynamic pressure separator, oil-gas separator and centrifugal ventilator.Through accessed to various aspects of the material and practiced, we can find that RNG k-ε turbulence model can provide a more comprehensive and accurate numerical prediction to the dynamic pressure separator and Realizable k-ε turbulence model is applicable to simulate the flow field of oil-gas separator and centrifugal ventilator.Basing on simulations of the single-phase flow field of separators, applied DPM two-phase model to do some numerical simulations about two-phase flow field of dynamic pressure separator, oil-gas separator and centrifugal.With the’particle tracks’function of DPM model, obtained separation efficiencies of separators.By changing the dynamic pressure separator inlet velocity and the rotor speed of oil-gas separator and centrifugal ventilator, obtained the separation efficiencies of the separators under different conditions.The input speed can be seen has a great impact on the separation efficiency.The bubble is seen as a non-deformed particle in theDPM model, and ignored the bubble deformation, aggregation, fragmentation and other factors.To make up for this DPM’s deficiencie, this paper applied VOF two-phase model to do some numerical simulations about oil-gas two-phase flow field of oil-gas separator.From the simulation results the phenomenon can be clearly seen that oil-gas’s stratification, separation and the air spill from the oil.