The Study On The Impact Of Vane Diffuser On The Impeller

Centrifugal compressors, large energy consumers, are widely used in energy power and petrochemical and other important sectors in national economy. Therefore, it is high time to develop high-performance centrifugal compressors to meet the development needs of industries, which is essential to the level of industrial development and economic construction in our country.The vane diffuser can significantly improve the efficiency of the model stage for centrifugal compressor small flow coefficient model. However, it is careful to use vane diffuser for taking into the impact of the diffuser to impeller. Studies have shown that the radial clearance between the centrifugal impeller and vane diffuser has played an important role in performance influence on centrifugal compressors. However, the unsteady flow of centrifugal compressors on design conditions caused by the interaction between the impeller and vane-diffuser would create a bad effect on performance. The efficiency of centrifugal compressors decreased for the impact of vane-diffuser on off-design conditions. Based on leading edge of the vane diffuser is closer to the impeller rim, unsteady numerical simulation is studied by changing the flow to observe the pressure fields on the impeller in this paper.Taking into account the bad flow in the internal impeller on small flow condition will affect the impeller blades, centrifugal compressor with the vaneless diffuser need to be simulated on different condition. A result is obtained by compare several plans.