Importance of Mechanical Losses Modeling in the Performance Prediction of Radial Turbochargers under Pulsating Flow Conditions

Serrano, Juan José; Olmeda, Pablo; Tiseira, A.; Lefebvre, Alain

doi:10.4271/2013-01-0577

Cited by 29 publications

(24 citation statements)

References 16 publications

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“…The last system to model is the oil pump, which power can be tim ed as: es at (21) where the oil pressure was measured and a pump efficiency 0.9 is assumed. As the oil pump is a volumetric pump, its volumetric flow is directly related with en ine e g spe d: (22) where a 0.0079 was estimated from available manufacturer data.…”

Section: Ancillaries Systems Lossesmentioning

confidence: 99%

“…• Several works describing detailed friction model to estimate the friction in the piston assembly, crankshaft bearing and valve train along with the power to drive the ancillaries system [20][21][22][23].…”

Section: Page 2 Of 17mentioning

confidence: 99%

“…Hence, the market pressure along with the increasing warning due to the effect of GHG emissions is pushing the researchers and manufacturers to search for more efficient engines with lower consumption and CO 2 emissions. The efforts are oriented to different issues such as thermal management [11][12][13][14], indicated cycle optimization [15][16][17], incylinder heat transfer (HT) reduction [18,19], friction and ancillaries losses reduction [20][21][22][23] or engine downsizing [24] between others.…”

Section: Introductionmentioning

confidence: 99%

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A New Tool to Perform Global Energy Balances in DI Diesel Engines

Payri¹,

Olmeda²,

Martín³

et al. 2014

SAE Int. J. Engines

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The generalization of exhaust aftertreatment systems along with the growing awareness about climate change is leading to an increasing importance of the efficiency over other criteria during the design of reciprocating engines. Using experimental and theoretical tools to perform detailed global energy balance (GEB) of the engine is a key issue for assessing the potential of different strategies to reduce consumption. With the objective of improving the analysis of GEB, this paper describes a tool that allows calculating the detailed internal repartition of the fuel energy in DI Diesel engines. Starting from the instantaneous in-cylinder pressure, the tool is able to describe the different energy paths thanks to different submodels for all the relevant subsystems. Hence, the heat transfer from gases to engine walls is obtained with specific convective and radiative models in the chamber and ports; the repartition of the heat flux throughout the engine metal elements towards the oil and coolant is estimated with a lumped capacitance model; finally, the ancillary systems and friction losses are obtained through specific semiempirical submodels. The validation of the tool is performed in a 4-cylinder DI Diesel engine instrumented to perform detailed experimental GEB. Finally, a simple analysis of combined internal and external analysis in the complete engine map shows the effect of operating conditions on each energy term. Thus it is demonstrated the utility of the proposed tool, that complements the experimental heat flow measurements in Diesel engine researches oriented to the reduction of energy consumption.

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Section: Ancillaries Systems Lossesmentioning

confidence: 99%

Section: Page 2 Of 17mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A New Tool to Perform Global Energy Balances in DI Diesel Engines

Payri¹,

Olmeda²,

Martín³

et al. 2014

SAE Int. J. Engines

Self Cite

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“…Heat transfer properties of turbochargers can be determined and used to compute the behaviour of the turbocharger under arbitrary temperature conditions [3,4,5,6]. Mechanical losses models show also an important role in the prediction of turbocharger performance under both steady-state and pulsating flow conditions [7,8]. To address the main effects in turbine performance under unsteady flow, both experimental and numerical tests must be carried out.…”

Section: Introductionmentioning

confidence: 99%

Development and validation of a radial variable geometry turbine model for transient pulsating flow applications

Galindo

Tiseira

Fajardo

et al. 2014

Energy Conversion and Management

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Elsevier Galindo, J.; Tiseira Izaguirre, AO.; Fajardo, P.; García-Cuevas González, LM. (2014). Development and validation of a radial variable geometry turbine model for transient pulsating flow applications. Energy AbstractThis paper presents the development and validation of a one-dimensional radial turbine model able to be used in automotive turbocharger simulations. The model has been validated using results from a numerical 3D CFD simulation of stationary and pulsating flow in a variable geometry radial turbine. As the CFD analysis showed, the main non-quasi-steady behavior of the turbine is due to the volute geometry, so special care was taken in order to properly model it while maintaining low computational costs. The flow in the volute has been decomposed in its radial and azimuthal direction. The azimuthal flow corresponds to the flow moving along the volute, while the radial flow is computed by coupling its flow with a stator model. Although the stator caused fewer accumulation effects than the volute, a small accumulation model has been used for it, which also allows to compute the evolution of the flow inside the turbine with lower costs. The flow in the moving rotor can be considered quasi-steady, so a zero-dimensional model for the rotor has been developed. Several losses models where implemented for both the stator and the rotor. The results show good agreement with the CFD computations.

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“…Thus, different strategies are proposed to achieve these objectives; thermal management improvement [1,2], indicated cycle optimization [3,4], in-cylinder heat transfer (HT) reduction [5,6], reduction of friction and auxiliaries losses [7,8] or engine downsizing [9] among others. In the present work, the research effort has been focused on improving knowledge of in-cylinder heat transfer.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Radiation Heat Transfer in a Light-Duty Diesel Engine

Benajes¹,

Martín²,

García³

et al. 2015

SAE Int. J. Engines

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In the last two decades engine research has been mainly focused on reducing pollutant emissions. This fact together with growing awareness about the impacts of climate change are leading to an increase in the importance of thermal efficiency over other criteria in the design of internal combustion engines (ICE). In this framework, the heat transfer to the combustion chamber walls can be considered as one of the main sources of indicated efficiency diminution. In particular, in modern direct-injection diesel engines, the radiation emission from soot particles can constitute a significant component of the efficiency losses. Thus, the main of objective of the current research was to evaluate the amount of energy lost to soot radiation relative to the input fuel chemical energy during the combustion event under several representative engine loads and speeds. Moreover, the current research characterized the impact of different engine operating conditions on radiation heat transfer. For this purpose, a combination of theoretical and experimental tools were used. In particular, soot radiation was quantified with a sensor that uses two-color thermometry along with its corresponding simplified radiation model. Experiments were conducted using a 4-cylinder direct-injection light-duty diesel engine fully instrumented with thermocouples. The goal was to calculate the energy balance of the input fuel chemical energy.Results provide a characterization of radiation heat transfer for different engine loads and speeds as well as radiation trends for different engine operating conditions.

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Importance of Mechanical Losses Modeling in the Performance Prediction of Radial Turbochargers under Pulsating Flow Conditions

Cited by 29 publications

References 16 publications

A New Tool to Perform Global Energy Balances in DI Diesel Engines

A New Tool to Perform Global Energy Balances in DI Diesel Engines

Development and validation of a radial variable geometry turbine model for transient pulsating flow applications

An Investigation of Radiation Heat Transfer in a Light-Duty Diesel Engine

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