The particle-gas two-phase flow in the high-pressure centrifugal blower of 9-26 type was simulated three dimensionally with computational fluid dynamics Fluent at the condition of non-uniform air speed on the outlet of the fan.The result of the simulation showed the inhomogeneity of particle concentration at outlet of the exhauster

which agrees well with the measurement results at the same condition.Particles enrichment near the outside and rear side of the volute casing is caused by the centrifugal force and the flow entrainment according to the simulation prediction.This phenomenon could be used to improve the particles separation at the outlet of fan.