Redesign of a Radial Turbine Variable Stator Geometry with Optimized Free Space Parameter for Improved Efficiency 2017-24-0154
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.
Citation: Eichhorn, R., Boot, M., Smeulders, D., and Cuijpers, M., "Redesign of a Radial Turbine Variable Stator Geometry with Optimized Free Space Parameter for Improved Efficiency," SAE Technical Paper 2017-24-0154, 2017, https://doi.org/10.4271/2017-24-0154. Download Citation
Ruud Eichhorn, Michael Boot, David Smeulders, Michel Cuijpers
Eindhoven University of Technology
13th International Conference on Engines & Vehicles