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research-article

DEVELOPMENT OF A NEW LOW-COST TANDEM VGT CONCEPT FOR TURBOCHARGER APPLICATIONS

[+] Author and Article Information
Rodrigo Rodriguez Erdmenger

GE Global Research, Munich, Germany
rodrigo.rodriguez_erdmenger@ge.com

Katya Menter

GE Global Research, Munich, Germany
katya.menter@gmail.com

Rogier Giepman

GE Global Research, Munich, Germany
rogier.giepman@ge.com

Aneesh Vadvadgi

GE Global Research, Bangalore, India
aneesh.vadvadgi@ge.com

Thomas Lavertu

GE Global Research, Niskayuna, USA
lavertut@ge.com

Thomas Leonard

IHI Charging Systems International, Heidelberg, Germany
tleonard06@qub.ac.uk

Stephen W T Spence

Queens University of Belfast (QUB), Belfast, UK
s.w.spence@qub.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4041279 History: Received July 01, 2018; Revised August 05, 2018

Abstract

The air handling system for large diesel/gas engines such as those used on locomotive, marine, and power generation applications require turbochargers with a high reliability and with turbomachinery capable to adjust to different operating conditions and transient requirements. The usage of variable geometry turbocharging (VGT) provides flexibility to the air handling system but adds complexity, cost and reduces the reliability of the turbocharger in exchange for improved engine performance and transient response. For this reason, it was desirable to explore designs that could provide the variability required by the air handling system, without the efficiency penalty of a conventional waste gate and with as little added complexity as possible. The current work describes a new low-cost variable geometry turbine design to address these requirements. The new tandem nozzle concept proposed is applicable to both axial and radial turbines, and has been designed using conventional 1D models and 2D/3D CFD methods. The concept has furthermore been validated experimentally on two different test rigs. In order to avoid the long lead times of procuring castings, the nozzle for the axial turbine was manufactured using new additive manufacturing techniques. Both the axial turbine and the radial turbine designs showed that the concept is capable to achieve a mass flow variability of more than 15% and provide a robust and cost-effective alternative to conventional VGT designs by significantly reducing the number of moveable parts.

Copyright (c) 2018 by ASME
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