Effects of blade bowing on the performance of a high pressure-ratio turbocharger centrifugal compressor with self-recirculation casing treatment

The effects of blade bowing on the performance of a high pressure-ratio turbocharger centrifugal compressor were studied by experiments and numerical simulation. The results showed that the negative bowing was capable of increasing the choke mass rate and the efficiency but decreased the surge mass flow rate, while the positive bowing had the opposite effects. When cou- pling with the self-recirculation casing treatment, the surge mass flow rate of the compressor with negative bowing blade was almost identical with that of the prototype, while the choke mass flow rate was still larger, and the total effect contributed to an increase of the stable flow range by 5.85% at design speed. Besides, the flow mechanism of the coupling effects of blade bow- ing and self-recirculation casing treatment was discussed.