Determination and Representation of Turbocharger Thermodynamic Efficiencies

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F16%3A00308066" target="_blank" >RIV/68407700:21220/16:00308066 - isvavai.cz</a>

Výsledek na webu

<a href="http://papers.sae.org/2016-01-1042" target="_blank" >http://papers.sae.org/2016-01-1042</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4271/2016-01-1042" target="_blank" >10.4271/2016-01-1042</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Determination and Representation of Turbocharger Thermodynamic Efficiencies

Popis výsledku v původním jazyce

The boost pressure demands call for high efficiency turbochargers. Perfect matching to an engine and controlling in operation is a prerequisite, especially if highly diluted mixture is used. The main impact on four-stroke engine efficiency is performed via gas exchange work, Correct turbocharger representation, usually performed by maps, should be delivered by turbocharger manufacturers and applied in simulation optimizations. The robust calibration methods are required for fast-running real time simulations used for model-based control. The paper clarifies the relations between apparent and real turbocharger isentropic efficiencies at steady-flow testbed and their impact on engine cycle optimization by simulation. Simple procedures excluding the impact of heat transfer inside a turbocharger are described. The described methods are based on the use of overall turbocharger efficiency. If details are needed, cold turbine flow tests and direct evaluation of compressor power using Eulerian theorem should be applied. Reynolds number influence should be taken into account. The regression model of turbine shaft heat transfer is used for correction of friction losses. The possibilities of turbine map measurement are analyzed for achieving wide range of blade speed ratio values using different turbine inlet temperature. The reasons for turbine physical model instead of map-based approach are explained on several specific examples. Apparent turbine efficiency, measured during engine tests, and possibilities to correct it by simulation are illustrated using examples of different exhaust systems with high level of pressure pulses.

Název v anglickém jazyce

Determination and Representation of Turbocharger Thermodynamic Efficiencies

Popis výsledku anglicky

The boost pressure demands call for high efficiency turbochargers. Perfect matching to an engine and controlling in operation is a prerequisite, especially if highly diluted mixture is used. The main impact on four-stroke engine efficiency is performed via gas exchange work, Correct turbocharger representation, usually performed by maps, should be delivered by turbocharger manufacturers and applied in simulation optimizations. The robust calibration methods are required for fast-running real time simulations used for model-based control. The paper clarifies the relations between apparent and real turbocharger isentropic efficiencies at steady-flow testbed and their impact on engine cycle optimization by simulation. Simple procedures excluding the impact of heat transfer inside a turbocharger are described. The described methods are based on the use of overall turbocharger efficiency. If details are needed, cold turbine flow tests and direct evaluation of compressor power using Eulerian theorem should be applied. Reynolds number influence should be taken into account. The regression model of turbine shaft heat transfer is used for correction of friction losses. The possibilities of turbine map measurement are analyzed for achieving wide range of blade speed ratio values using different turbine inlet temperature. The reasons for turbine physical model instead of map-based approach are explained on several specific examples. Apparent turbine efficiency, measured during engine tests, and possibilities to correct it by simulation are illustrated using examples of different exhaust systems with high level of pressure pulses.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

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 periodika

Society of Automotive Engineers Technical Paper Series

ISSN

0148-7191

e-ISSN

0148-7191

Svazek periodika

2016

Číslo periodika v rámci svazku

01

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

—

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-84975263348