Scavenged Pre-Chamber Volume Effect on Gas Engine Performance and Emissions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F19%3A00332253" target="_blank" >RIV/68407700:21220/19:00332253 - isvavai.cz</a>

Výsledek na webu

<a href="https://saemobilus.sae.org/content/2019-01-0258/" target="_blank" >https://saemobilus.sae.org/content/2019-01-0258/</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4271/2019-01-0258" target="_blank" >10.4271/2019-01-0258</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Scavenged Pre-Chamber Volume Effect on Gas Engine Performance and Emissions

Popis výsledku v původním jazyce

This work presents development and results of experimental and numerical investigations of an advanced ignition system with a scavenged pre-chamber for a natural gas fueled engine with a bore of 102 mm and stroke of 120 mm. Two combustion concepts are taken into account. The lean burn concept is used to minimize engine out emissions of nitric oxides (NOx) and to achieve high thermal efficiency at low load. The in-house designed scavenged pre-chamber enables the engine to be operated up to the air-excess ratio (lambda) of 2. A stoichiometric (lambda=1) operation is also possible. It is compatible with a three-way catalyst concept, at high load and potentially transient modes and can provide as high as possible engine power density. The influence of the scavenged pre-chamber volume on the combustion and performance within the range of the operational points of the naturally aspirated engine is presented in this paper. The two pre-chambers with different volume (2.2 % and 4.6 % of compression volume) were tested at steady state conditions. Experimental work was complemented with CFD simulations for detailed explanation of the physics inside the main combustion chamber and in the pre-chamber. The 3-D CFD model of the experimental engine was built in AVL Fire software. The size of the pre-chamber was tested as well to verify CFD mode performance versus experimental data. Both mentioned configurations were tested numerically using multi-cycle LES calculations. These results are analyzed in terms of mixture homogeneity, rate-of-heat-release and cycle-to-cycle variability.

Název v anglickém jazyce

Scavenged Pre-Chamber Volume Effect on Gas Engine Performance and Emissions

Popis výsledku anglicky

This work presents development and results of experimental and numerical investigations of an advanced ignition system with a scavenged pre-chamber for a natural gas fueled engine with a bore of 102 mm and stroke of 120 mm. Two combustion concepts are taken into account. The lean burn concept is used to minimize engine out emissions of nitric oxides (NOx) and to achieve high thermal efficiency at low load. The in-house designed scavenged pre-chamber enables the engine to be operated up to the air-excess ratio (lambda) of 2. A stoichiometric (lambda=1) operation is also possible. It is compatible with a three-way catalyst concept, at high load and potentially transient modes and can provide as high as possible engine power density. The influence of the scavenged pre-chamber volume on the combustion and performance within the range of the operational points of the naturally aspirated engine is presented in this paper. The two pre-chambers with different volume (2.2 % and 4.6 % of compression volume) were tested at steady state conditions. Experimental work was complemented with CFD simulations for detailed explanation of the physics inside the main combustion chamber and in the pre-chamber. The 3-D CFD model of the experimental engine was built in AVL Fire software. The size of the pre-chamber was tested as well to verify CFD mode performance versus experimental data. Both mentioned configurations were tested numerically using multi-cycle LES calculations. These results are analyzed in terms of mixture homogeneity, rate-of-heat-release and cycle-to-cycle variability.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/LO1311" target="_blank" >LO1311: Rozvoj Centra vozidel udržitelné mobility</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

WCX SAE World Congress Experience

ISBN

—

ISSN

0148-7191

e-ISSN

0148-7191

Počet stran výsledku

17

Strana od-do

1-17

Název nakladatele

SAE International

Místo vydání

Warrendale, PA

Místo konání akce

Detroit

Datum konání akce

9. 4. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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