Turbocharged SI-Engine Simulation With Cold and Hot-Measured Turbocharger Performance Maps

Aghaali, Habib; Ångström, Hans-Erik

doi:10.1115/gt2012-68758

Cited by 15 publications

(10 citation statements)

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“…The compressor housing temperature is a function of the compressed air temperature and the external heat transfer conditions. Additionally, the heat transfer condition cannot greatly influence the compressor pressure ratio [20,21]. As a result, the compressor housing temperature is decreased by the fan but the bearing housing temperature is not significantly affected in the core due to the hot oil flow around the shaft.…”

Section: Evaluation Of Different Heat Transfer Conditionsmentioning

confidence: 90%

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Evaluation of different heat transfer conditions on an automotive turbocharger

Aghaali

Ångström

Serrano

2014

International Journal of Engine Research

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This paper presents a combination of theoretical and experimental investigations for determining the main heat fluxes within a turbocharger. These investigations consider several engine speeds and loads as well as different methods of conduction, convection, and radiation heat transfer on the turbocharger. A one-dimensional heat transfer model of the turbocharger has been developed in combination with simulation of a turbocharged engine that includes the heat transfer of the turbocharger. Both the heat transfer model and the simulation were validated against experimental measurements. Various methods were compared for calculating heat transfer from the external surfaces of the turbocharger, and one new method was suggested.The effects of different heat transfer conditions were studied on the heat fluxes of the turbocharger using experimental techniques. The different heat transfer conditions on the turbocharger created dissimilar temperature gradients across the turbocharger. The results show that changing the convection heat transfer condition around the turbocharger affects the heat fluxes more noticeably than changing the radiation and conduction heat transfer conditions. Moreover, the internal heat transfers from the turbine to the bearing housing and from the bearing housing to the compressor are significant, but there is an order of magnitude difference between these heat transfer rates.

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Section: Evaluation Of Different Heat Transfer Conditionsmentioning

confidence: 90%

“…Equation (20) can be also calculated based on the mentioned equations for radiation and convection. The convection heat transfer, however, is the problematic part of heat transfer calculation.…”

Section: Comparison Of Different Methodsmentioning

confidence: 99%

Evaluation of different heat transfer conditions on an automotive turbocharger

Aghaali

Ångström

Serrano

2014

International Journal of Engine Research

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“…Therefore, the static pressure at the exhaust port outlet is not constant, but dependent on the engine components downstream. The static pressure applied at outlet boundary was obtained by onedimensional engine simulations [17,18] for a similar engine configuration, which have been validated with experimental measurements. This sequence is plotted in Fig.…”

Section: Case Descriptionmentioning

confidence: 99%

Flow effects due to valve and piston motion in an internal combustion engine exhaust port

Semlitsch

Mihăescu

2015

Energy Conversion and Management

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a b s t r a c tPerformance optimization regarding e.g. exhaust valve strategies in an internal combustion engine is often performed based on one-dimensional simulation investigation. Commonly, a discharge coefficient is used to describe the flow behavior in complex geometries, such as the exhaust port. This discharge coefficient for an exhaust port is obtained by laboratory experiments at fixed valve lifts, room temperatures, and low total pressure drops. The present study investigates the consequences of the valve and piston motion onto the energy losses and the discharge coefficient. Therefore, Large Eddy Simulations are performed in a realistic internal combustion geometry using three different modeling strategies, i.e. fixed valve lift and fixed piston, moving piston and fixed valve lift, and moving piston and moving valve, to estimate the energy losses. The differences in the flow field development with the different modeling approaches is delineated and the dynamic effects onto the primary quantities, e.g. discharge coefficient, are quantified. Considering the motion of piston and valves leads to negative total pressure losses during the exhaust cycle, which cannot be observed at fixed valve lifts. Additionally, the induced flow structures develop differently when valve motion is taken into consideration, which leads to a significant disparity of mass flow rates evolving through the two individual valve ports. However, accounting for piston motion and limited valve motion, leads to a minor discharge coefficient alteration of about one to two percent.

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“…These results indicate the high impact of heat transfer on the efficiency of the compressor and turbine, especially at low speeds and flanges, but the effect of heat transfer on the overall performance of the turbocharger is negligible since it does not affect the compressor and turbine compression ratio. In the investigations by [2], heat transfer was simulated from the turbine to the compressor, and it was assumed in the simulation that external heat transfer was merely from the turbine housing to the environment.…”

Section: Literaturereviewmentioning

confidence: 99%

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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Turbocharged SI-Engine Simulation With Cold and Hot-Measured Turbocharger Performance Maps

Cited by 15 publications

References 0 publications

Evaluation of different heat transfer conditions on an automotive turbocharger

Evaluation of different heat transfer conditions on an automotive turbocharger

Flow effects due to valve and piston motion in an internal combustion engine exhaust port

Heat Distribution of Micro Turbocharger Cooling System for Motorcycle Application

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