The Numerical Simulation Of Two Phase Flow In Centrifugal Impeller And Research On Conglutination Mechanism

Centrifugal ventilator used for exhausting gas contained of all kinds of dust, particularly used for the exhausting smoke contained of high degree of humidity, and the powder grain is small and high viscidity, will appear the violent vibration in a short time, shorten the service life of the centrifugal ventilators and affect the reliability of equipments. The spot investigation discovers that the attachment and accumulation of small powder grain mainly takes place on the blade suction surface, especially on the forepart and back-end district of the not-working surface of blade. The shed off of powder grain will break the equilibrium because of the accumulation, and break the equilibrium, result in the above phenomenon.In this paper, based on the Navier-Stokes equations and standard k-e turbulent model, the numerical simulation of the 3D turbulent flow in centrifugal impeller has been analyzed firstly with CFD software and FEM. The distribution of velocity, pressure and concentration in the blade to blade passage are presented at the representative operating conditions. Contrast to the PIV results, the numerical simulation is accurate and feasible.Joining together the simulation results with the actual operating circumstance, the dust conglutination mechanism has been analyzed primary. This study can be very helpful to improve and optimize the decontamination system design.The conclusion as follows:1) The degree of humidity is primary influence factor of conglutination.2) Pressure is the important factor of accumulation.