Basic Issues with High-Efficiency Turbochargers with Radial Turbines for Diesel Engines

Kód výsledku v IS VaVaI

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Výsledek na webu

<a href="http://www.lalibreria.upv.es" target="_blank" >http://www.lalibreria.upv.es</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Basic Issues with High-Efficiency Turbochargers with Radial Turbines for Diesel Engines

Popis výsledku v původním jazyce

The impact of turbocharger efficiency and the layout of air loop on engine cycle optimization at extremely downsized, two-stage turbocharged diesel engines is explained in the paper, aiming at the highest engine efficiency. Optimization was done locally along WOT speed curve, using mostly unconstrained input parameters and assuming full flexibility of engine and turbocharger design. This task puts contradictory demands on air loop features and boost pressure control. High boost level re-quires optimized two-stage turbocharging, which moves the optimum boost pressure to a level suitable for efficient combustion. The highest achievable isentropic efficiency of turbochargers and aerodynam-ic design matched to required performance is of utmost importance. Pressure wave impact on turbine performance, simulated by 1-D tools, can be estimated using developed regression models of correc-tion coefficients. Optimized engine cycle parameters can be fulfilled if preliminary turbine design is per-formed for low and rated speed variable geometry control. An important tool for adjacent optimization is physical modelling of a turbine instead of using turbine maps. It makes determination of the best turbine dimensions possible for the task intended. The individual efficiencies of both turbochargers can reach up to 55% if a compromise in impeller geometry is applied.

Název v anglickém jazyce

Basic Issues with High-Efficiency Turbochargers with Radial Turbines for Diesel Engines

Popis výsledku anglicky

The impact of turbocharger efficiency and the layout of air loop on engine cycle optimization at extremely downsized, two-stage turbocharged diesel engines is explained in the paper, aiming at the highest engine efficiency. Optimization was done locally along WOT speed curve, using mostly unconstrained input parameters and assuming full flexibility of engine and turbocharger design. This task puts contradictory demands on air loop features and boost pressure control. High boost level re-quires optimized two-stage turbocharging, which moves the optimum boost pressure to a level suitable for efficient combustion. The highest achievable isentropic efficiency of turbochargers and aerodynam-ic design matched to required performance is of utmost importance. Pressure wave impact on turbine performance, simulated by 1-D tools, can be estimated using developed regression models of correc-tion coefficients. Optimized engine cycle parameters can be fulfilled if preliminary turbine design is per-formed for low and rated speed variable geometry control. An important tool for adjacent optimization is physical modelling of a turbine instead of using turbine maps. It makes determination of the best turbine dimensions possible for the task intended. The individual efficiencies of both turbochargers can reach up to 55% if a compromise in impeller geometry is applied.

Druh

D - Stať ve sborníku

CEP obor

JT - Pohon, motory a paliva

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

THIESEL 2016

ISBN

978-84-9048-535-4

ISSN

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e-ISSN

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Počet stran výsledku

14

Strana od-do

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Název nakladatele

Universidad Politécnica de Valencia

Místo vydání

Valencia

Místo konání akce

Valencia

Datum konání akce

13. 9. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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