過給機駆動用ラジアル排気タービンの非定常流特性に関する研究 : 基本波形に対する準定常法性能予測

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This paper describes performances of a radial turbine for turbocharger under pulsating flows. The tests were carried out at sevral pulse frequencies with sinusoidal velocity wave forms produced by a rotary type pulse generator rig. Power measurement using digital torque detector based on phase difference method has successed to get the transient and mean torques. Turbine power was absorbed by two manners: one is done by a radial compressor under unsteady turbine flow and the other by a D.C motor generator under steady turbine flow conditions respectively. The quasi steady analysis was carried out using the steady turbine performance curves to predict the unsteady turbine performances. The test results show that the evaluated mass flow rate agrees well with measured experimental values all range of the velocity amplitude ratio. And the power output prediction becomes a little underestimations as increasing the ratio of velocity amplitude. The influence of pulse frequency is not remarkable.
1990-12-25