Numerical Assessment and Performance Maps Generation of a
                    Turbocharger Attempted to be Matched with an Automotive Engine

<div class="section abstract"><div class="htmlview paragraph">Turbochargers are still one of the most common solutions to improve internal combustion engines performance. The correct evaluation of turbochargers characteristic maps is one of the main issues to achieve a good matching with internal combustion engines. In a 1D procedure the accuracy of performance maps constitutes the basis of the turbocharger matching with the engine. The classical quasi-steady approach assumes that compressor and turbine characteristic maps are evaluated under the hypothesis of adiabatic turbocharger behavior. The aim of the paper is the investigation of the effect of heat transfer phenomena on the measured turbocharger maps. A model to correct compressor efficiency evaluated starting from measured data, thus removing the heat transfer effects, is proposed. The compressor steady flow behavior has been analyzed through specific tests performed at the test rig for components of propulsion systems of the University of Genoa, under various heat transfer conditions. The experimental campaign was conducted on a water-cooled turbocharger for spark ignition engines and on an uncooled turbocharger for diesel engines considering the effect of different heat transfer conditions. Then, measurements were carried out under quasi-adiabatic conditions, maintaining a constant temperature between the compressor - intermediate casing - turbine to validate the proposed model. Thanks to this specific campaign it was possible to validate the proposed model highlighting a high degree of accuracy. The main advantage of the method presented here compared to others developed by the authors or found in the open literature is its ease of use, thus requiring a small amount of geometric and physical information that can be obtained in a standard turbocharger test bench.</div></div>

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Turbocharging Automotive Engines: A Decision-Making Approach for Optimal Turbocharger Selection

Amine,

Mahfoudh,

Tarabet

et al. 2023

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">An approach for turbocharging automotive engines to reach targeted performance was developed in which the environmental and economic aspects during the turbocharger-engine matching process were considered. Three numerical assessment levels based on output performance, exhaust emissions and techno-economic metrics are established to support users during the decision-making of adequate turbochargers that meets targeted data in terms of boosting and emissions. Satisfactory improvements are measured from a 1.5L, three-cylinders, turbocharged Diesel engine, in terms of brake specific fuel consumption, thermal efficiency and NOx concentrations of about 1.73% (decrease in fuel consumption of around 2.22ml/s), 1.76%, and 4.53% (correspond to a diminution of around 217.54ppm), respectively, at the engine’s extreme conditions (full load and rated power). In addition, for an application of another turbocharger, remarkable improvements in terms of HC and CO concentrations of about 6.23% (reduction of 41.167ppm), and 2.61% (diminution of around 1.271ppm), respectively, were found at the same engine’s extreme conditions. Furthermore, the superimposition of the engine operating area on compressor and turbine maps of all tested turbochargers ensured a secure functioning of the proposed compressor, reasonable mechanical and thermal loads of the in-cylinder chamber, and practical turbine inlet temperature at the engine’s extreme operations. Consequently, the enhanced methodology is considered a promising and helpful decision-support method that can be followed by researchers during the engine turbocharging process at both the earlier and last stages providing powerful and clean mobility of the vehicle.</div></div>

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Numerical Assessment and Performance Maps Generation of a Turbocharger Attempted to be Matched with an Automotive Engine

Cited by 3 publications

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Fluid dynamic analysis and design strategies for a deswirler device for the direct measurement of radial turbine isentropic efficiency in experimental test rig

Fluid dynamic analysis and design strategies for a deswirler device for the direct measurement of radial turbine isentropic efficiency in experimental test rig

Heat Transfer Correction Model for Turbocharger Compressor Performance Maps

Turbocharging Automotive Engines: A Decision-Making Approach for Optimal Turbocharger Selection

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