Turbocharger heat transfer and mechanical losses influence in predicting engines performance by using one-dimensional simulation codes

Serrano, José Ramón; Olmeda, Pablo; Arnau, Francisco José; Dombrovsky, Artem; Smith, Lindsay

doi:10.1016/j.energy.2015.03.130

Cited by 59 publications

(45 citation statements)

References 28 publications

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“…The layout of the second gas stand is shown in Figure 3. 4. It has similar capabilities making possible the achievement of higher turbine inlet temperature and pressure so bigger turbochargers can be tested.…”

Section: Gas Standmentioning

confidence: 99%

“…Equation 4.14 can be directly fitted using the experimental values of water enthalpy drop flow. Figure 4.9 is obtained after the fitting procedure.…”

Section: Airmentioning

confidence: 99%

“…Sidorow et al [44] have proposed a three stage division of the compression and expansion processes as shown in Figure 2. 4. In their proposal heat is extracted or added before the adiabatic compression or expansion and after it.…”

Section: One Dimensional Modelsmentioning

confidence: 99%

“…The reciprocal view factors can be evaluated using Equation 4.17, with the exception of the ambient view factor, so the 9 view factors corresponding to compressor inner surface are computed with these considerations. …”

Section: F C−t(ls)mentioning

confidence: 99%

“…The heat radiation between two gray surfaces (as the turbocharger can be considered [47]) can be calculated as [65], using Equation 4.15…”

Section: External Radiationmentioning

confidence: 99%

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Synthesis of the 1D modelling of turbochargers and its effects on engine performance prediction

Dombrovsky¹

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Low fuel consumption is one of the main requirement for current internal combustion engines for passenger car applications. One of the most used strategies to achieve this goal is to use downsized engines (smaller engines while maintaining power) what implies the usage of turbochargers. The coupling between both machines (the turbocharger and the internal combustion engines) presents many difficulties due to the different nature between turbomachines and reciprocating machines. These difficulties make the optimal design of the turbocharged internal combustion engines a complicated issue.In these thesis a strong effort has been made to improve the global understanding of different physical phenomena occurring in turbochargers and in turbocharged engines. The work has been focused on the 1D modelling of the phenomena since 1D tools currently play a major role in the engine design process. Both experimental and modelling efforts have been made to understand the heat transfer and gas flow processes in turbochargers. Previously to the experimental analysis a literature review has been made in which the state of the art of heat transfer and gas flow modelling in turbochargers have been analysed.The experimental effort of the thesis has been focused on measuring different turbochargers in the gas stand and the engine test bench. In the first case, the gas stand, a more controlled environment, has been used to perform tests at different conditions. Hot tests with insulated and not insulated turbocharger have been made to characterise the external heat transfer. Moreover, adiabatic tests have been made to compare the effect of the heat transfer on different turbocharger variables and for the validation of the turbine gas flow models. In the engine test bench full and partial load tests have been made for model validation purposes.For the models development task, the work has been divided in heat flow models and gas flow models. In the first case, a general heat transfer model for turbochargers has been proposed based on the measured turbochargers and data available from previous works of the literature. This model includes a procedure of conductive conductances estimation, internal and external convection correlations and radiation estimation procedure. In the case of the gas flow modelling, an extended model for VGT performance maps extrapolation for both the efficiency and the mass flow has been developed as well as a model for discharge coefficient prediction in valves for two stage turbochargers.Finally, the models have been fully validated coupling them with a 1D modelling software simulating both the gas stand and the whole engine. On the one hand, the results of the validation show that compressor and turbine outlet temperature prediction is highly improved using the developed models. This results prove that the turbocharger heat transfer phenomena are important not only for partial load and transient simulation but also in full loads. On the other hand, the VGT extrapolation model accuracy is high even at...

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Section: Gas Standmentioning

confidence: 99%

“…Equation 4.14 can be directly fitted using the experimental values of water enthalpy drop flow. Figure 4.9 is obtained after the fitting procedure.…”

Section: Airmentioning

confidence: 99%

Section: One Dimensional Modelsmentioning

confidence: 99%

Section: F C−t(ls)mentioning

confidence: 99%

“…The heat radiation between two gray surfaces (as the turbocharger can be considered [47]) can be calculated as [65], using Equation 4.15…”

Section: External Radiationmentioning

confidence: 99%

See 3 more Smart Citations