Effects of Tip Clearance of Nozzle Vanes on Performance of Radial Turbine Rotor

[+] Author and Article Information
H. Hayami, M. Yamaguchi

Institute of Advanced Material Study, Kyushu University 86, Kasuga 816, Japan

Y. Senoo

Miura Company, Ltd., Matsuyama 799-26, Japan

Y. I. Hyun

Interdisciplinary Graduate School of Engineering Sciences, Kyushu University 39, Kasuga 816, Japan

J. Turbomach 112(1), 58-63 (Jan 01, 1990) (6 pages) doi:10.1115/1.2927421 History: Received January 17, 1989; Online June 09, 2008


In radial turbines with variable nozzles, the flow downstream of the nozzles could be distorted by the leakage flow through the tip clearance of the upstream nozzle vanes. To investigate the effects of flow distortion on the performance of turbine rotors, two rotors with different numbers of blades were tested for three types of distorted velocity distribution at the rotor inlet. In the case of the 20-blade rotor with moderate blade loading, the flow distortion at the rotor inlet had a negligible effect on the rotor characteristics, and the measured data on the turbine performances agreed well with prediction. Predictions were made with a conventional one-dimensional flow model applied to the rotor flow, while a two-layer flow model was applied to the flow in the nozzle with clearance. In the case of the 10-blade rotor with heavy blade loading, however, the rotor performance was found to be sensitive to the inlet flow distortion and was considerably lower than the prediction.

Copyright © 1990 by The American Society of Mechanical Engineers
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