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

Ruud Eichhorn; Michael Boot; David Smeulders; Michel Cuijpers

doi:10.4271/2017-24-0154

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

Ruud Eichhorn, Michael Boot, David Smeulders, Michel Cuijpers

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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 language	English
Article number	24-0154
Journal	SAE Technical Papers
Volume	2017
DOIs	https://doi.org/10.4271/2017-24-0154
Publication status	Published - 1 Jan 2017
Event	SAE 13th International Conference on Engines and Vehicles, ICE 2017 - Capri, Napoli, Italy Duration: 10 Sept 2017 → 14 Sept 2017

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

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.",

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T1 - Redesign of a radial turbine variable stator geometry with optimized free space parameter for improved efficiency

AU - Eichhorn, Ruud

AU - Boot, Michael

AU - Smeulders, David

AU - Cuijpers, Michel

PY - 2017/1/1

Y1 - 2017/1/1

N2 - 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.

AB - 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.

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DO - 10.4271/2017-24-0154

M3 - Conference article

AN - SCOPUS:85028456855

SN - 0148-7191

VL - 2017

JO - SAE Technical Papers

JF - SAE Technical Papers

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T2 - SAE 13th International Conference on Engines and Vehicles, ICE 2017

Y2 - 10 September 2017 through 14 September 2017

ER -

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

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