Influence of the Number of Blades of Miniature Centrifugal Impeller on Compressor Performance

Abstract

In order to study the influence of the number of centrifugal impeller blades on the aerodynamic performance of the centrifugal compressor, the influence of the number of blades with and without splitter on the pressure ratio, isentropic efficiency, mass flow, shaft power and outlet airflow angle of the compressor is analysed. The research results show that for transonic miniature centrifugal compressors, increasing the number of blades can improve the compressor’s isentropic efficiency and pressure ratio. The compressor’s pressure ratio and isentropic efficiency first increase and then decrease with the increase in the number of blades. When the number of blades with splitter blades is 12, the pressure ratio of the centrifugal compressor reaches the maximum of 1.69, and the isentropic efficiency is 68.8%; increasing the splitter blade compressor has little change in pressure ratio, but can improve the compressor Isentropic efficiency and mass flow. The number of blades is an effective method to improve its isentropic efficiency and pressure ratio. This analysis method provides a reference for the judicious selection of the number of blades and provides a reference for the design of miniature centrifugal compressors under high Reynolds number.