Experimental performance evaluation of a 99.0 mm radial inflow nozzled turbine with varying shroud profiles

Abstract

In addition to the experimental data already presented by Spence, Doran and Art in 1999, further comprehensive performance tests were carried out on the same 99.0 mm radial turbine using four different shroud profiles with three nozzles of varying sizes. Efficiency maps are presented for each of 12 different turbine configurations tested. For the largest stator size giving the highest flowrate the turbine efficiency is shown to vary by over 3.5 per cent with different shroud profiles. An examination of the effect of shroud profile with respect to rotor incidence angle revealed that a larger radius of shroud curvature was better for positive incidence while a smaller shroud radius was most efficient for negative incidence.