Numerical Research on Effects of Splitter Blades on a Transonic Centrifugal Compressor Impeller

The method of numerical simulation is used to optimize the aerodynamic design of a transonic centrifugal compressor,effects of the splitter blade number and lengths of splitter blades on the centrifugal compressor performance have been investigated.The results showed that at a fixed blade number condition,length of splitter blades has no much influence on the performance of centrifugal compressor under low flow rate condition,but under large flow rate condition,the performance decreases with the increasing length of splitter blades.Great attention should be paid to the Profile line optimization of splitter blade.Based on the given centrifugal compressor model,numerical simulation were carried on to obtain the best blade number,analysis showed 18 to20 is the best blade number range and performance is better than former compressor.