Search Results

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.

The use of twin-scroll turbocharger turbine in automotive powertrain has been known for providing better transient performance over conventional single-scroll turbine. This has been accredited to the preservation of exhaust flow energy in the twin-scroll volute. In the current study, the performance comparison between a single and twin-scroll turbine has been made experimentally on a 1.5L passenger car gasoline engine. The uniqueness of the current study is that nearly identical engine hardware has been used for both the single and twin-scroll turbine volutes. This includes the intake and exhaust manifold geometry, turbocharger compressor, turbine rotor and volute scroll A/R variation trend over circumferential location. On top of that, the steady-state engine performance with both the volutes, has also been tuned to have matching brake torque.