1D simulation of a turbocharged Diesel engine with comparison of short and long EGR route solutions

Cornolti, Luca; Onorati, Angelo; Cerri, Tarcisio; Montenegro, Gianluca; Piscaglia, F.

doi:10.1016/j.apenergy.2013.04.016

Cited by 57 publications

(32 citation statements)

References 26 publications

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“…Controlled auto-ignition (CAI) combustion, also known as homogeneous charge compression ignition (HCCI), combines two major stages in ICE cycles, including preparation of premixed air and fuel and the compression of the homogeneous charge until the commencement of auto-ignition [5][6][7]. Accordingly, there will be no longer flame front (e.g., SI engine) and diffusion burning (e.g., diesel engine) [8][9][10][11][12]. To achieve CAI/HCCI combustion, high intake charge temperatures and substantial amount of charge dilution have to be present.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the influence of internal and external EGR on the combustion characteristics of a controlled auto-ignition two-stroke cycle engine

et al. 2014

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of the influence of internal and external EGR on the combustion characteristics of a controlled auto-ignition two-stroke cycle engine

et al. 2014

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“…Simulating the entire process of an internal combustion engine with all degrees of freedom is computationally unaffordable. Therefore, fast simplified models are utilized for the initial design process of the internal combustion engine [8]. However, the physics and the behavior of the engine must be represented by the model.…”

Section: Introductionmentioning

confidence: 99%

Flow effects due to pulsation in an internal combustion engine exhaust port

Semlitsch¹,

Wang²,

Mihăescu³

2014

Energy Conversion and Management

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In an internal combustion engine, the residual energy remaining after combustion in the exhaust gasses can be partially recovered by a downstream arranged device. The exhaust port represents the passage guiding the exhaust gasses from the combustion chamber to the energy recovering device, e.g. a turbocharger. Thus, energy losses in the course of transmission shall be reduced as much as possible. However, in one-dimensional engine models used for engine design, the exhaust port is reduced to its discharge coefficient, which is commonly measured under constant inflow conditions neglecting engine-like flow pulsation. In this present study, the influence of different boundary conditions on the energy losses and flow development during the exhaust stroke are analyzed numerically regarding two cases, i.e. using simple constant and pulsating boundary conditions. The compressible flow in an exhaust port geometry of a truck engine is investigated using three-dimensional Large Eddy Simulations (LES). The results contrast the importance of applying engine-like boundary conditions in order to estimate accurately the flow induced losses and the discharge coefficient of the exhaust port. The instantaneous flow field alters significantly when pulsating boundary conditions are applied. Thus, the induced losses by the unsteady flow motion and the secondary flow motion are increased with inflow pulsations. The discharge coefficient decreased about 2% with flow pulsation. A modal flow decomposition method, i.e. Proper Orthogonal Decomposition (POD), is used to analyze the coherent structures induced with the particular inflow and outflow conditions. The differences in the flow field for different boundary conditions suggest to incorporate a modeling parameter accounting for the quality of the flow at the turbocharger turbine inlet in one-dimensional simulations.

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“…On the other hand, investigations on dual loop EGR systems were developed mainly through numerical simulations [22][23][24], limiting test bench activities to model validation. Consequently, little experimental information on the application of hybrid EGR systems in current downsized automotive diesel engines is available.…”

Section: Introductionmentioning

confidence: 99%

Effects of a Dual-Loop Exhaust Gas Recirculation System and Variable Nozzle Turbine Control on the Operating Parameters of an Automotive Diesel Engine

2017

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Reduction of NO X emissions and fuel consumption are the main topics in engine development, forcing the adoption of complex techniques and components, whose interactions have to be clearly understood for proper and reliable operations and management of the whole system. The investigation presented in this paper aimed at the development of integrated control strategies of turbocharging, high pressure (HP) and low pressure (LP) exhaust gas recirculation (EGR) systems for better NO X emissions and fuel consumption, while analyzing their reciprocal influence and the resulting variations of engine quantities. The study was based on an extended experimental program in three part load engine operating conditions. In the paper a comparison of the behavior of the main engine sub-systems (intake and exhaust circuits, turbocharger turbine and compressor, HP and LP EGR loops) in a wide range of operating modes is presented and discussed, considering open and closed loop approaches for variable nozzle turbine (VNT) control, and showing how these affect engine performance and emissions. The potential of significant decrease in NO X emissions through the integration of HP and LP EGR was confirmed, while a proper VNT management allowed for improved fuel consumption level, if an open loop control scheme is followed. At higher engine speed and load, further actions have to be applied to compensate for observed soot emissions increase.

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1D simulation of a turbocharged Diesel engine with comparison of short and long EGR route solutions

Cited by 57 publications

References 26 publications

Experimental investigation of the influence of internal and external EGR on the combustion characteristics of a controlled auto-ignition two-stroke cycle engine

Experimental investigation of the influence of internal and external EGR on the combustion characteristics of a controlled auto-ignition two-stroke cycle engine

Flow effects due to pulsation in an internal combustion engine exhaust port

Effects of a Dual-Loop Exhaust Gas Recirculation System and Variable Nozzle Turbine Control on the Operating Parameters of an Automotive Diesel Engine

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