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Research Papers

Turbocharger Heat Transfer Determination With a Power-Based Phenomenological Approach and a Conjugate Heat Transfer Validation

[+] Author and Article Information
Bojan Savic

Department of Powertrain Technologies,
Technical University,
Berlin 10587, Germany
e-mail: b.savic@tu-berlin.de

Xunan Gao, Roland Baar

Department of Powertrain Technologies,
Technical University,
Berlin 10587, Germany

1Corresponding author.

2Deceased.

Manuscript received February 15, 2018; final manuscript received October 16, 2018; published online January 31, 2019. Assoc. Editor: Coutier-Delgosha Olivier.

J. Turbomach 141(2), 021011 (Jan 31, 2019) (9 pages) Paper No: TURBO-18-1037; doi: 10.1115/1.4041806 History: Received February 15, 2018; Revised October 16, 2018

This investigation represents work on a model to determine heat flows on turbochargers. Recently, a power-based method has been developed to compare adiabatic and hot gas tests from radial turbines and compressors. Moreover, this method has shown the ability to correct standard measurements in terms of heat flows. In this investigation, a wastegate turbocharger has been investigated from a small gasoline engine. For validation purposes of the isentropic efficiencies, a conjugate-heat-transfer (CHT) simulation has been carried out on the turbine. Results have shown that isentropic efficiencies fit well for values of turbine inlet temperatures of 600 °C between corrected data and the simulation. For other temperatures, the differences between the determined values and CHT are greater. The differences rise with higher temperatures generally. So, the objective of the investigation is to improve the existing method for determining turbocharger heat transfers. Hence, an additional dependency of turbine inlet temperatures has been implemented in the approach and tested for T3 = 400 °C, 600 °C, 800 °C, and 950 °C. The modification has shown better results and smaller differences to CHT simulation. Especially, at low speeds where the former approach has had big differences, the modification improves the distribution for the investigated turbine inlet temperatures.

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References

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Figures

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Fig. 1

Turbocharger heat flows

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Fig. 2

Heat flow approach

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Fig. 3

Turbine effective power against isentropic compressor power [4]

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Fig. 4

Turbinemesh structure without ambience domain

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Fig. 5

Instrumentation of the turbine

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Fig. 11

Turbocharger test bench Technical University Berlin [4] (DIN EN ISO 10628-2, DIN 28000-4, DIN 28000-5)

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Fig. 6

((a)–(d)) Isentropic efficiencies against isentropic compressor power: (a) T3 = 400 °C, (b) T3 = 600 °C, (c) T3 = 800 °C, and (d) T3 = 950 °C

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Fig. 10

((a)–(d)) Results of the modification at higher temperatures: (a) T3 = 800 °C, (b) T3 = 950 °C, (c) T3 = 800 °C larger scale, and (d) T3 = 950 °C larger scale

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Fig. 9

((a)–(d)) Results of the modification at lower temperatures: (a) T3 = 400 °C, (b) T3 = 600 °C, (c) T3 = 400 °C larger scale, and (d) T3 = 600 °C larger scale

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Fig. 8

T3 800 °C: Modification of the power-based approach at high temperatures

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Fig. 7

Modification of the choice of axes

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