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Although radial turbines are used in small turbochargers, real flow has never been conclusively cleared. Accordingly, we, the authors measured the internal flow of the rotating blades using a Laser Doppler Velocimeter (LDV) and a high frequency response pressure probe. The arising loss mechanism was examined, and comparison was done about analysis conducted by means of Computational Fluid Dynamics (CFD). The results of measurement with LDV and analysis by CFD are in good agreement, and the arising loss mechanism was found to consist of the accumulation of low energy fluid on shroud side suction surface of blade outlet.

To improve the performance of the centrifugal compressor for automotive turbocharger, it is essential to understand the complicated flow phenomena caused by its complex blade geometry. Authors carried out the detailed flow measurement of the centrifugal compressor impeller uisng Laser Doppler Velocimeter (LDV). The test impeller is a 9.1 times enlarged model of real turbocharger. In result authors found out the low velocity region is grown up at the suction surface of the inducer according to the reduction of flow rate. The experimental data are compared with the three dimensional (3D) viscous flow analysis and acceptable agreement was observed.