Redesign of a radial turbine variable stator geometry with optimized free space parameter for improved efficiency

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Abstract

The Free Space Parameter (FSP) is evaluated as a predictor for the efficiency of a Variable Geometry Turbine (VGT). Experiments show an optimum value at 2 times the vane height. However, the optimum was found to be dependent on the pressure ratio, yielding an optimum closer to 2.5 at pressures of 2 and 2.5 bar. After this validation the FSP of a conventional VGT is evaluated and an attempt is made to improve the efficiency of this turbine using the FSP. A new geometry is proposed which yields more favorable FSP values. Experiments show that at the original design point the efficiency is unchanged. However, at both larger and smaller nozzle area's the turbine efficiency improves as predicted by the FSP values. A relative efficiency improvement of 3 to 28 % is attained.

Original languageEnglish
Article number24-0154
JournalSAE Technical Papers
Volume2017
DOIs
Publication statusPublished - 1 Jan 2017
EventSAE 13th International Conference on Engines and Vehicles, ICE 2017 - Capri, Napoli, Italy
Duration: 10 Sep 201714 Sep 2017

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