To adapt the slip factor model proposed by Qiu to the through-flow design of micro-centrifugal impellers

three empirical parameters were introduced to reduce the system error. Firstly

the solving method of these empirical parameters and the impact on the design accuracy were researched. It is seen that empirical parameter cr influences the design accuracy greatly. Secondly

with employment of the improved Qiu slip factor model

a micro-centrifugal impeller was designed. The predicted slip factors impacted by cr in the model were compared with the impeller-outlet-averaged slip factors resulted from the CFD flow field simulation. The most suitable values of cr were found at different prescribed design overall parameters. It is found that cr nearby 0.7 has a best estimation

though the overall parameters of micro- or large-centrifugal compressor impeller vary widely.