Loss model for off-design performance analysis of radial turbines with pivoting-vane, variable-area statorsAn off-design performance loss model for a radial turbine with pivoting, variable-area stators is developed through a combination of analytical modeling and experimental data analysis. A viscous loss model is used for the variation in stator loss with setting angle, and stator vane end-clearance leakage effects are predicted by a clearance flow model. The variation of rotor loss coefficient with stator setting angle is obtained by means of an analytical matching of experimental data for a rotor that was tested with six stators, having throat areas from 20 to 144% of the design area. An incidence loss model is selected to obtain best agreement with experimental data. The stator vane end-clearance leakage model predicts increasing mass flow and decreasing efficiency as a result of end-clearances, with changes becoming significantly larger with decreasing stator area.
Document ID
19810049762
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Meitner, P. L. (U.S. Army, Propulsion Laboratory, Cleveland Ohio, United States)
Glassman, A. J. (NASA Lewis Research Center Cleveland, Ohio, United States)