On-Engine Turbocharger Turbine Inlet Flow Characterization

Ehrlich, Daniel A.; Lawless, Patrick B.; Fleeter, Sanford

doi:10.4271/971565

Cited by 12 publications

(14 citation statements)

References 4 publications

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“…Based on previous results, cf. Ehrlich et al [1] and Hellstro¨m and Fuchs [2], the flow conditions generated in the manifold are such that they will have an effect on turbine performance.…”

Section: Discussionmentioning

confidence: 99%

“…It has been shown by several researchers that the efficiency of the turbocharger is dependent on the flow structures at the turbine inlet, see for example Ehrlich et al [1] and Hellstro¨m and Fuchs [2]. Even a simple pipe bend will generate significant secondary flow motion [3] and, as both the manifold and the exhaust port contain complex pipe shapes with bends and curvatures, strong and unsteady secondary flows will be generated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

LES of the Exhaust Flow in a Heavy-Duty Engine

Bodin

Wang

Mihăescu³

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

LES of the Exhaust Flow in a Heavy-Duty Engine

Bodin

Wang

Mihăescu³

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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show abstract

“…Several works have already been done e.g. by Winterbone and Pearson [4], Karamanis et al [5], Ehrlich et al [6] to indicate if the pulsating flow is a consequence of the convection of mass flow through the turbine or it is caused by the action of pressure waves. Ehrlich [7] shows, based on experimental results, that both effects are significant.…”

Section: State Of the Artmentioning

confidence: 99%

Turbomachines Under Periodic Admission: Axiomatic Performance Prediction

Nakhjiri

Pelz

2012

Volume 8: Turbomachinery, Parts A, B, and C

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In calibration tasks under engine conditions, steady-state manufacturer performance maps are applied to periodic turbocharger operation. This procedure is exposed to considerable uncertainties. In this work the axiomatic form of the energy equation as well as Euler turbomachinery equation are used to generate a general form of the respective equations which allow for periodicity. Thus, the concept of apparent speed and apparent efficiency is introduced. The latter can attain values greater than unity.

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“…In particular, under unsteady flow conditions, the expansion ratio and the turbine power are usually underestimated, while the mass flow is over-predicted. The experimental work at Purdue University 13 has suggested that the internal combustion (IC) engine flow arriving at the turbine inlet is comprised both convective and inertial flow with pressure propagation (wave action) effects. In 1D simulation, traditional quasi-steady turbine models assume that the unsteady performances can be predicted by a straightforward interpolation of the steady flow mass and efficiency characteristics, but there are some limits.…”

Section: Introductionmentioning

confidence: 99%

A detailed one-dimensional model to predict the unsteady behavior of turbocharger turbines for internal combustion engine applications

Piscaglia

Onorati

Marelli

et al. 2018

International Journal of Engine Research

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This article describes an investigation of the unsteady behavior of turbocharger turbines by one-dimensional modeling and experimental analysis. A one-dimensional model has been developed to predict the performance of a vaneless radial-inflow turbine submitted to unsteady flow conditions. Different from other approaches proposed in the literature, the turbine has been simulated by separating the effects of casing and rotor on the unsteady flow and by modeling the multiple rotor entries from the volute. This is a simple and effective way to represent the turbine volute by a network of one-dimensional pipes, in order to capture the mass storage effect due to the system volume, as well as the circumferential variation of fluid dynamic conditions along the volute, responsible for variable admittance of mass into the rotor through blade passages. The method developed is described, and the accuracy of the one-dimensional model is shown by comparing predicted results with measured data, achieved on a test rig dedicated to the investigation of automotive turbochargers. The validation of the code is presented and an analysis of the flow unsteadiness, based on a variety of parameters, is proposed.

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On-Engine Turbocharger Turbine Inlet Flow Characterization

Cited by 12 publications

References 4 publications

LES of the Exhaust Flow in a Heavy-Duty Engine

LES of the Exhaust Flow in a Heavy-Duty Engine

Turbomachines Under Periodic Admission: Axiomatic Performance Prediction

A detailed one-dimensional model to predict the unsteady behavior of turbocharger turbines for internal combustion engine applications

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