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Research Papers: Gas Turbines: Vehicular and Small Turbomachines

Variable Geometry Compressors for Heavy Duty Truck Engine Turbochargers

[+] Author and Article Information
Michael Wöhr

Daimler AG,
Heavy Duty Engine Development,
Stuttgart 70546, Germany
e-mail: michael.woehr@daimler.com

Markus Müller

Daimler AG,
Heavy Duty Engine Development,
Stuttgart 70546, Germany
e-mail: markus.mk.mueller@daimler.com

Johannes Leweux

Daimler AG,
Heavy Duty Engine Development,
Stuttgart 70546, Germany
e-mail: johannes.leweux@daimler.com

1Corresponding author.

Contributed by the Vehicular and Small Turbomachines Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 24, 2017; final manuscript received August 28, 2017; published online April 20, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(7), 072701 (Apr 20, 2018) (10 pages) Paper No: GTP-17-1391; doi: 10.1115/1.4038323 History: Received July 24, 2017; Revised August 28, 2017

This paper presents the development approach, design, and evaluation of three turbocharger compressors with variable geometry for heavy duty engines. The main goal is the improvement of fuel economy without sacrifices regarding any other performance criteria. In a first step, a vaned diffuser parameter study shows that efficiency improvements in the relevant operating areas are possible at the cost of reduced map width. Concluding from the results, three variable geometries with varying complexity based on vaned diffusers are designed. Results from the hot gas test stand and engine test rig show that all systems are capable of increasing compressor efficiency and thus improving fuel economy in the main driving range of heavy duty engines. The most significant differences can be seen regarding the engine brake performance. Only one system meets all engine demands while improving fuel economy.

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Figures

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Fig. 1

Baseline compressor map with performance curves

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Fig. 2

Fuel consumption of S-HH-S

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Fig. 3

Parameterized vaned diffuser model

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Fig. 4

Compressor map of VD01 with efficiency benefit as contour lines

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Fig. 5

Dimensionless map width of vaned diffusers

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Fig. 6

Total pressure loss and pressure coefficient for vaned and vaneless compressors

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Fig. 7

Loss factors of vaned diffusers

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Fig. 8

Schematic diagrams of variable compressors

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Fig. 12

VRVC compressor map with efficiency benefit as contour lines

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Fig. 13

VSVC compressor map with efficiency benefit as contour lines

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Fig. 14

VPVC compressor map with efficiency benefit as contour lines

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Fig. 15

Variable compressor efficiency at engine full load

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Fig. 16

Variable compressor actuator signal at engine full load

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Fig. 17

Engine brake power

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Fig. 18

Reduction in fuel consumption in main driving range with variable compressors

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Fig. 19

Schematic diagram of hot gas test rig

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Fig. 20

Schematic diagram of test bench engine

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