Representation of Two-Stroke Engine Scavenging in 1D Models Using 3D Simulations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F18%3A00329724" target="_blank" >RIV/68407700:21220/18:00329724 - isvavai.cz</a>

Výsledek na webu

<a href="https://trid.trb.org/view/1560599" target="_blank" >https://trid.trb.org/view/1560599</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4271/2018-01-0166" target="_blank" >10.4271/2018-01-0166</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Representation of Two-Stroke Engine Scavenging in 1D Models Using 3D Simulations

Popis výsledku v původním jazyce

The paper proposes the way of using scavenging curves, i.e., dependence of residual gas fraction in exhaust port or valve on residual fraction in a cylinder, found by CFD simulations. In the general case, exhaust gas recirculation outside of a cylinder (EGR) or internal gas recirculation caused by variable values of burned gas backflow to inlet system may influence in-cylinder residual gas fraction. These deviations may take place during engine optimization, done by 1D models. The determination of scavenging curves via 3D CFD simulations is a time consuming process, which cannot be repeated for every 1D case. The way of generalization of scavenging curves is based on reduction of cylinder burned gas contents (cylinder residual ratio) to scavenging progress variable, and reduction of burned gas contents in exhaust port gas flow (exhaust residual ratio), which makes the use of single result of 3D simulation possible for more variants of inlet timing or different pressure drop between inlet and exhaust system. The reduction is based on a stepwise integrated burned gas contents in fresh charge for every 1D simulated case. By this way, the procedure developed accelerates the optimization process substantially. The important condition is compatibility between 1D and 3D boundary conditions. The results are validated using dedicated 3D simulations.

Název v anglickém jazyce

Representation of Two-Stroke Engine Scavenging in 1D Models Using 3D Simulations

Popis výsledku anglicky

The paper proposes the way of using scavenging curves, i.e., dependence of residual gas fraction in exhaust port or valve on residual fraction in a cylinder, found by CFD simulations. In the general case, exhaust gas recirculation outside of a cylinder (EGR) or internal gas recirculation caused by variable values of burned gas backflow to inlet system may influence in-cylinder residual gas fraction. These deviations may take place during engine optimization, done by 1D models. The determination of scavenging curves via 3D CFD simulations is a time consuming process, which cannot be repeated for every 1D case. The way of generalization of scavenging curves is based on reduction of cylinder burned gas contents (cylinder residual ratio) to scavenging progress variable, and reduction of burned gas contents in exhaust port gas flow (exhaust residual ratio), which makes the use of single result of 3D simulation possible for more variants of inlet timing or different pressure drop between inlet and exhaust system. The reduction is based on a stepwise integrated burned gas contents in fresh charge for every 1D simulated case. By this way, the procedure developed accelerates the optimization process substantially. The important condition is compatibility between 1D and 3D boundary conditions. The results are validated using dedicated 3D simulations.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20303 - Thermodynamics

Projekt

<a href="/cs/project/ED2.1.00%2F03.0125" target="_blank" >ED2.1.00/03.0125: Pořízení technologie pro Centrum vozidel udržitelné mobility</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název statě ve sborníku

SAE Technical Papers

ISBN

—

ISSN

0148-7191

e-ISSN

0148-7191

Počet stran výsledku

10

Strana od-do

—

Název nakladatele

SAE International

Místo vydání

Warrendale, PA

Místo konání akce

Detroit

Datum konání akce

10. 4. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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