Analysis for the Influence of Impeller Fillet Size on Aerodynamic and Fatigue Life of High-flow Centrifugal Compressor
For the purpose of analyzing the influence of different fillet sizes on the aerodynamic perform-ance and fatigue life of the compressor,firstly,a series of design models were obtained by adjusting the fillet size of the root and top of the blade under the premise that the main structural parameters of the cen-trifugal impeller remained unchanged;secondly,the full three-dimensional steady-state simulation of the whole stage of the centrifugal compressor of different design models was carried out by numerical simula-tion method,and the strength of the centrifugal impeller was calculated at the design speed;and finally the fatigue life of the impeller components was calculated by the estimation method and the material S-N curve.The results show that compared with the fillet radius,the influence of the fillet angle on the aero-dynamic performance is more significant,the isentropic efficiency is reduced by about 5％and the total pressure ratio is reduced by about 0.07 caused by fillet angle at the large flow point;compared with the fillet angle,the fillet radius is more conducive to reducing the stress value;and the fatigue life value esti-mated by empirical parameters for the centrifugal impeller with different fillet sizes deviates from the ex-perimental value by 3％at the maximum and 0.09％at the minimum.
centrifugal impellerfilletaerodynamic performancestrengthfatigue life
万方数据
维普
