Improving Turbocharged Engine Simulation by Including Heat Transfer in the Turbocharger

Aghaali, Habib; Ångström, Hans-Erik

doi:10.4271/2012-01-0703

Cited by 15 publications

(10 citation statements)

References 9 publications

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“…This was considerably lower than the results from Shaaban [3] who found 70% of heat transfer on the turbine side to flow to ambient; however at such low turbine inlet temperatures there will be smaller thermal gradients to ambient. In fact, the work by Baines measured heat transfer in the turbine only up to 700 W, which is significantly lower than the 2.7 kW measured by Aghaali and Angstrom [5] from engine test data. Romagnoli and MartinezBotas [6] studied heat transfer effects on a turbocharger installed on an engine running under constant engine speed and brake tor que conditions.…”

Section: T U R B O C H a R G E R T H E R M A L I N S T R U M E N T A mentioning

confidence: 48%

Analysis and Modeling of the Transient Thermal Behavior of Automotive Turbochargers

Burke

2014

Journal of Engineering for Gas Turbines and Power

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Turbochargers are a key technology to deliver fuel consumption reductions on future in ternal combustion engines. However, the current industry standard modeling approaches assume the turbine and compressor operate under adiabatic conditions. Although some state o f the art modeling approaches have been presented for simulating the thermal behavior, these have focused on thermally stable conditions. In this work, an instru mented turbocharger was operated on a 2.2 liter diesel engine and in parallel a one dimensional lumped capacity thermal model was developed. For the first time this paper presents analysis of experimental and modeling results under dynamic engine operating conditions. Engine speed and load conditions were varied to induce thermal transients with turbine inlet temperatures ranging from 200 to 800 °C; warm-up behavior from 25 °C ambient was also studied. Following a model tuning process based on steady oper ating conditions, the model was used to predict turbine and compressor gas outlet tem peratures, doing so with an RMSE of 8.4 and 7.1 °C, respectively. On the turbine side, peak heat losses from the exhaust gases were observed to be up to double those observed under thermally stable conditions due to the heat accumulation in the structure. During warm-up, the model simplifications did not allow for accurate modeling of the compres sor, however on the turbine side gas temperature prediction errors were reduced from 150 to around 40 °C. The main benefits from the present modeling approach appear to be in turbine outlet temperature prediction, however modeling improvements are identified for future work.

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Section: T U R B O C H a R G E R T H E R M A L I N S T R U M E N T A mentioning

confidence: 48%

Analysis and Modeling of the Transient Thermal Behavior of Automotive Turbochargers

Burke

2014

Journal of Engineering for Gas Turbines and Power

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“…Therefore, an accurate evaluation of turbocharger performance, and the matching and control of a turbocharger using an engine model have become more important [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

An Investigation on the Efficiency Correction Method of the Turbocharger at Low Speed

Chung

Kim

et al. 2018

Energies

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Abstract:The heat transfer in the turbocharger occurs due to the temperature difference between the exhaust gas and intake air, coolant, and oil. This heat transfer causes the efficiency of the compressor and turbine to be distorted, which is known to be exacerbated during low rotational speeds. Thus, this study proposes a method to mitigate the distortion of the test result data caused by heat transfer in the turbocharger. With this method, the representative compressor temperature is defined and the heat transfer rate of the compressor is calculated by considering the effect of the oil and turbine inlet temperatures at low rotation speeds, when the cold and the hot gas test are simultaneously performed. The correction of compressor efficiency, depending on the turbine inlet temperature, was performed through both hot and cold gas tests and the results showed a maximum of 16% error prior to correction and a maximum of 3% error after the correction. In addition, it shows that it is possible to correct the efficiency distortion of the turbocharger by heat transfer by correcting to the combined turbine efficiency based on the corrected compressor efficiency.

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“…Heat transfer in the turbocharger is a major cause of these deviations, and when the heat transfer condition on the turbocharger is changed the turbocharger performance maps cannot accurately predict the turbine and the compressor outlet temperatures and they need to be corrected. One can find in the literature at least two methods to account for the heat transfer of the turbocharger in 1D engine simulation: correcting the performance maps for non-adiabatic conditions [9] or including the heat transfer of the turbocharger in the engine simulation while the performance maps are kept constant [10]. In this study the second method was used.…”

Section: Turbocharged Engine Simulationmentioning

confidence: 99%

“…The main assumptions of this method are that most of the heat transfer to the surrounding air takes place at the compressor scroll and that most of the heat transfer from the exhaust gas occurs in the turbine volute. Consequently, to take into account heat transfer on the turbocharger, a heat source immediately after the compressor and a heat sink just before the turbine are built into the model [10]. The simulated heat flow from the turbine and the simulated heat flow to the compressor are artificial heat flows that are required to correct for differential heat transfers in the turbocharger between the turbocharger test rig and the engine laboratory.…”

Section: Turbocharged Engine Simulationmentioning

confidence: 99%

“…The study of heat transfer in turbochargers has become an important aspect of turbocharged engine development, and there has been growing interest in the heat transfer analysis of automotive turbochargers [1,2,3,4,5,6,7]. Other issues in regards to heat transfer in turbochargers are also important, including the effect of heat transfer on the turbocharger performance [7,8,9], turbocharger performance correction for non-adiabatic conditions [9], and turbocharged engine simulations [10].…”

Section: Introductionmentioning

confidence: 99%

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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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Improving Turbocharged Engine Simulation by Including Heat Transfer in the Turbocharger

Cited by 15 publications

References 9 publications

Analysis and Modeling of the Transient Thermal Behavior of Automotive Turbochargers

Analysis and Modeling of the Transient Thermal Behavior of Automotive Turbochargers

An Investigation on the Efficiency Correction Method of the Turbocharger at Low Speed

Evaluation of different heat transfer conditions on an automotive turbocharger

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