Variable Geometry Turbocharger Technologies for Exhaust Energy Recovery and Boosting‐A Review

Feneley, A.; Pesiridis, Apostolos; Andwari, Amin Mahmoudzadeh

doi:10.1016/j.rser.2016.12.125

Cited by 136 publications

(48 citation statements)

References 56 publications

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“…The Galvas [14] loss model collection was selected for the analysis. According to Harley et al [13,15,16], not only is it a robust model, but it also operates best across a variety of automotive turbocharger radial designs. Then, computational fluid dynamics (CFD) modelling was applied to verify all the results.…”

Section: Preliminary Design Of Centrifugal Compressorsmentioning

confidence: 99%

Modelling of Electrically-Assisted Turbocharger Compressor Performance

2019

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For the purposes of design of a turbocharger centrifugal compressor, a one-dimensional modelling method has been developed and applied specifically to electrically-assisted turbochargers (EAT). For this purpose, a mix of authoritative loss models was applied to determine the compressor losses. Furthermore, an engine equipped with an electrically-assisted turbocharger was modelled using commercial engine simulation software (GT-Power) to assess the performance of the engine equipped with the designed compressor. A commercial 1.5 L gasoline, in-line, 3-cylinder engine was selected for modeling. In addition, the simulations have been performed for an engine speed range between 1000 and 5000 rpm. The design target was an electric turbocharger compressor that could meet the boosting requirements of the engine with noticeable improvement in a transient response. The results from the simulations indicated that the EAT improved the overall performance of the engine when compared to the equivalent conventional turbocharged engine model. Moreover, the electrically-assisted turbochargers (EAT) equipped engine with power outputs of 1 kW and 5 kW EAT was increased by an average of 5.96% and 15.4%, respectively. This ranged from 1000 rpm to 3000 rpm engine speed. For the EAT model of 1 kW and 5 kW, the overall net reduction of the BSFC was 0.53% and 1.45%, respectively, from the initial baseline engine model.

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Section: Preliminary Design Of Centrifugal Compressorsmentioning

confidence: 99%

Modelling of Electrically-Assisted Turbocharger Compressor Performance

2019

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“…Typical state-of-the-art waste heat recovery (WHR) technologies include mechanical or electric turbocompounding, bottoming cycles, and thermoelectric generators [1,5]. A mechanical turbocompound system uses the exhaust gas energy to spin a turbine, which can then be linked to the crankshaft, offering more output power and as much as 5% better fuel economy.…”

Section: Waste Heat Recoverymentioning

confidence: 99%

“…Several technologies have been developed since the 1990s, when worldwide emissions standards started to impose boundaries on the levels of acceptable emissions of vehicles, which resulted in ever-reducing levels of emissions, as well as fuel consumption [3,4]. These technologies include the adoption of forced induction with the use of a supercharger and/or a turbocharger, usage of electric energy through high-capacity batteries, and combinations of both [5][6][7]. This study aims to examine vehicle technology that uses the combination of the above technologies, which are known as electric hybrid vehicles, and they use an internal combustion engine (ICE) combined with an electric powertrain as part of the propulsion architecture of the vehicle.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Electric Vehicle Performance with Organic Rankine Cycle Waste Heat Recovery System

Andwari

Pesiridis

Karvountzis-Kontakiotis

et al. 2017

Applied Sciences

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This study examines the implementation of a waste heat recovery system on an electric hybrid vehicle. The selected waste heat recovery method operates on organic Rankine cycle principles to target the overall fuel consumption improvement of the internal combustion engine element of a hybrid powertrain. This study examines the operational principle of hybrid electric vehicles, in which the internal combustion engines operates with an electric powertrain layout (electric motors/generators and batteries) as an integral part of the powertrain architecture. A critical evaluation of the performance of the integrated powertrain is presented in this paper whereby vehicle performance is presented through three different driving cycle tests, offering a clear assessment of how this advanced powertrain configuration would benefit under several different, but relevant, driving scenarios. The driving cycles tested highlighted areas where the driver could exploit the full potential of the hybrid powertrain operational modes in order to further reduce fuel consumption.

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“…In the attempt of mitigating the turbo lag and the poor low-end torque, many solutions have been presented so far, such as: lower density material [4] [5], low inertia wheels, variable geometry turbines (VGT), variable nozzle turbines (VNT); or even more advanced concepts such as twin turbo and electrically assisted turbochargers. For a complete review on variable geometry technologies the reader is referred to [6].…”

Section: Introductionmentioning

confidence: 99%

Axial Flow Turbine Concept for Conventional and e-Turbocharging

Cappiello¹,

Tuccillo²,

Cameretti³

et al. 2019

SAE Technical Paper Series

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Engine downsizing has established itself as one of the most successful strategies to reduce fuel consumption and pollutant emissions in the automotive field. In this regard, a major role is played by the turbocharging, allowing to increase engine power density, and so reducing engine size and weight. However, the need for turbocharging imposes some issues to be solved. In the attempt of mitigating turbo lag and poor low-end torque, many solutions have been presented in the open literature so far, such as: low inertia turbine wheels and variable geometry turbines; or even more complex concepts such as twin turbo and electrically assisted turbochargers. None of them appears as definitive, though. As possible way of reducing turbine rotor inertia, and so the turbo lag, also the change of turbine layout has been investigated, and it revealed itself as viable option, leading to the use of mixed-flow turbines. Only recently, the use of axial-flow turbines, with the aim of reducing rotor inertia, has been proposed as well. The current paper documents a case study involving the design of unconventional axial-flow turbocharger turbines for a 1.6 liters S.I. light-duty automotive engine. The goal of the work is to improve engine transient performance, while guaranteeing the same level of boost pressure with respect to the baseline case, i.e. engine equipped with radial-flow turbine. To do so, two possible proposals are investigated: a "conventional" turbocharger concept, say turbine and compressor mechanically coupled, is compared against an advanced turbocharging concept, say turbine and compressor electrically coupled. A single-stage axial flow turbine is employed, for both cases, to extract energy from the exhaust gas. Ad hoc preliminary turbine design tools are developed, accounting for both design point and offdesign performance. Turbocharger-engine matching is subsequently verified by means of a 1D engine model. Finally, results are used to derive guidelines for unconventional turbocharging turbine design.

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Variable Geometry Turbocharger Technologies for Exhaust Energy Recovery and Boosting‐A Review

Cited by 136 publications

References 56 publications

Modelling of Electrically-Assisted Turbocharger Compressor Performance

Modelling of Electrically-Assisted Turbocharger Compressor Performance

Hybrid Electric Vehicle Performance with Organic Rankine Cycle Waste Heat Recovery System

Axial Flow Turbine Concept for Conventional and e-Turbocharging

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