For axial-type turbines which operate at partial admission, a performance prediction model is developed. In this study, losses generated within the turbine are classified to windage loss, expansion loss and mixing loss. The developed loss model is compared with experimental results. Particularly, if a turbine operates at a very low partial admission rate, a circular-type nozzle is more efficient than a rectangular-type nozzle. For this case, a performance prediction model is developed and an experiment is conducted with the circular-type nozzle. The predicted result is compared with the measured performance, and the developed model quite well agrees with the experimental results. So the developed model could be applied to predict the performance of axial-type turbines which operate at various partial admission rates or with different nozzle shape.
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He, L., 1997, 'Computation of Unsteady Flow Through Steam Turbine Blade Row at Partial Admission,' Proc. Instn. Mech. Engrs., Vol. 211 Part A, pp. 197-205
Bohn, D., Drexler, Chr. and Emunds, R., 1993, 'Experimental and Theoretical Investigations into the Nonuniform Flow of a Partial Admission Turbine with a Multistage Blading,' VGB Kraftwerkstechnik 73, No. 8, pp. 610-608
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Kim, Jae-Hwan 2007. "" 유체기계저널 = Journal of fluid machinery, 10(1): 91~96