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Research Papers: Internal Combustion Engines

Numerical Study of the Implementation of an Active Control Turbocharger on Automotive Diesel Engines

[+] Author and Article Information
R. Gozalbo

Universidad Politécnica de Valencia,
CMT—Motores Térmicos,
Camino de Vera, s/n,
46022, Valencia, Spain
e-mail: vidolrui@mot.upv.es

Available at www.openwam.org

1Corresponding author.

Contributed by the IC Engine Division of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received November 10, 2011; final manuscript received October 24, 2012; published online April 23, 2013. Assoc. Editor: Zoran S. Filipi.

J. Eng. Gas Turbines Power 135(5), 052801 (Apr 23, 2013) (7 pages) Paper No: GTP-11-1377; doi: 10.1115/1.4007963 History: Received November 10, 2011; Revised October 24, 2012

Active control turbocharger (ACT) has been proposed as a way to improve turbocharger performance under highly pulsating exhaust flows. This technique implies that the variable geometry mechanism in the turbine is used to optimize its position as a function of the instantaneous mass flow during the engine cycle. Tests presented in the literature showed promising results in a pulsating gas-stand. In this work, a modeling study has been conducted at different engine conditions aimed to quantify the gain in on-engine conditions and to develop a strategy to integrate the ACT system within the engine. Different ways of changing the displacement of the variable mechanism have been analyzed by means of a one-dimensional gas dynamic model. The simulations have been carried out at constant engine operating points defined by fixed air-to-fuel ratio for different mechanism displacement functions around an average position that guarantees the desired amount of intake air. The benefits in overall engine efficiency are lower to those predicted in the literature. It can be concluded that it is not possible to use the ACT system to optimize the turbine operating point and at the same time to control the engine operating point.

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Figures

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Fig. 1

Simplified scheme of the turbine model

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Fig. 2

Instantaneous modeled and measured results for test points #1 and #4

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Fig. 3

Sine wave displacement model

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Fig. 4

Sine wave instantaneous efficiency

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Fig. 5

Sine wave efficiency-displacement plot

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Fig. 6

Half-sine wave displacement model

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Fig. 7

Half-sine wave instantaneous efficiency

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Fig. 8

Modified half-sine displacement model

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Fig. 9

Half-sine wave instantaneous efficiency

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Fig. 10

Half-sine wave efficiency-displacement plot

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