Mechanism of Turbocharger Coking in Gasoline Engines

Miyata, Itsuki; Hirano, Satoshi; Tanada, Masayuki; Fujimoto, Kosuke

doi:10.4271/2015-01-2029

Cited by 12 publications

(7 citation statements)

References 2 publications

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“…Consequently, the turbocharger service life is severely reduced. The finding is consistent with findings of past studies by [9], which heat stored in the exhaust manifold and turbine housing is "soaks back" into the centre section of the turbocharger after shutdown. "Heat soak back" is the greatest turbo killer and should be taken seriously by turbocharger engineers and turbo users alike.…”

Section: Fig 2: Axial Positions For Temperature Sensorssupporting

confidence: 91%

Heat Distribution of Micro Turbocharger Cooling System for Motorcycle Application

Radzak¹,

Ibrahim²,

Shaffee³

2019

IJRTE

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The heat produced in turbocharger has the potential to destroy the bearing system and the oil piston ring. For the past years, the researchers have focused on heat transfer of micro turbocharger. The lack of research on the cooling system of the turbocharger has motivated the author to publish this paper. In this paper, the electrical water pump with air blower is used to reduce the heat effect. The impact of adding electric water pump o heat distribution on turbocharger has been discovered by conducting experimental research. The experimental research was conducted on one cylinder, two-stroke with Lifan engine 160 cc equipped with the turbocharger. The temperatures of the turbine, bearing housing, coolant inlet and outlet are measured and analyzed in this turbocharged engine test rig.

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Section: Fig 2: Axial Positions For Temperature Sensorssupporting

confidence: 91%

Heat Distribution of Micro Turbocharger Cooling System for Motorcycle Application

Radzak¹,

Ibrahim²,

Shaffee³

2019

IJRTE

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“…This type of degraded oil can leave traces in the turbine shaft and bearings affecting the dynamics of the turbocharger. 17,18…”

Section: Introductionmentioning

confidence: 99%

A methodology to study oil-coking problem in small turbochargers

Serrano

Tiseira

García-Cuevas

et al. 2018

International Journal of Engine Research

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In compliance with oncoming emission directives, turbocharging and increasing complexity in the turbocharger system demands a great effort from researchers on the development of effective procedures and tools to cope with the new technological exigencies. This article describes a methodology for studying oil-coking influence in turbocharger performance. A preliminary evaluation and calibration is done. The aim of this work focuses on the development of methodologies and tools that help to evaluate and understand the consequences that degraded oils can generate in the bearing system during enhanced oil-coking procedure. Several experimental tests have been carried out in an engine test bench and using an independent lubrication system that only feeds the turbocharger. The test campaign is done under a specific engine cycle and using oil artificially contaminated at two different levels. The work is divided into two parts. The first part provides a description and definition of test conditions for measuring of the maximum temperature in the bearing system and the second part tackles the measurement and post-processing of the main instantaneous parameters defining the engine and turbocharger behavior.

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“…The advantage of computing the internal temperature in the central housing, lubrication channels, and maximum level of temperature at different points in the bearing system makes the reduction of experimental tasks. Besides, this model will let to evaluate thermal damage done to the system itself, as well as influences on the working fluid temperatures which leads oil coke formation, that can affect the performance of the engine [19]. The thermal heat transfer properties such as conductivity and capacitances obtained from this model has been used for to feed and improve a radial lumped model of heat transfer [1] that predicts temperatures only at local points in the turbocharger central housing.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, this model will let to evaluate thermal damage done to the system itself and influences on the working fluid temperatures which leads to oil coke formation that can affect the performance of the engine. 18 The thermal heat transfer properties such as conductivity and capacitances obtained from this model have been used to feed and improve a radial lumped model of heat transfer 19 that predict temperatures only at local points in the turbocharger central housing. The validation applied for a non-water-cooled turbocharger is illustrated, and finally, the main results are discussed.…”

Section: Introductionmentioning

confidence: 99%

Fast three-dimensional heat transfer model for computing internal temperatures in the bearing housing of automotive turbochargers

Gil

Tiseira

García-Cuevas

et al. 2018

International Journal of Engine Research

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Each of the elements that make up the turbocharger has been gradually improved. In order to ensure that the system does not experience any mechanical failures or loss of efficiency, it is important to study which engine-operating conditions could produce the highest failing rate. Common failing conditions in turbochargers are mostly achieved due to oil contamination and high temperatures in the bearing system. Thermal management becomes increasingly important for the required engine performance. Therefore, it has become necessary to have accurate temperature and heat transfer models. Most thermal design and analysis codes need data for validation; often the data available fall outside the range of conditions the engine experiences in reality leading to the need to interpolate and extrapolate disproportionately. This article presents a fast three-dimensional heat transfer model for computing internal temperatures in the central housing for non-water cooled turbochargers and its direct validation with experimental data at different engine-operating conditions of speed and load. The presented model allows a detailed study of the temperature rise of the central housing, lubrication channels, and maximum level of temperature at different points of the bearing system of an automotive turbocharger. It will let to evaluate thermal damage done to the system itself and influences on the working fluid temperatures, which leads to oil coke formation that can affect the performance of the engine. Thermal heat transfer properties obtained from this model can be used to feed and improve a radial lumped model of heat transfer that predicts only local internal temperatures. Model validation is illustrated, and finally, the main results are discussed.

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Mechanism of Turbocharger Coking in Gasoline Engines

Cited by 12 publications

References 2 publications

Heat Distribution of Micro Turbocharger Cooling System for Motorcycle Application

Heat Distribution of Micro Turbocharger Cooling System for Motorcycle Application

A methodology to study oil-coking problem in small turbochargers

Fast three-dimensional heat transfer model for computing internal temperatures in the bearing housing of automotive turbochargers

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