1-WP03-012 ZV: Optimized advanced pre-chamber design

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F22%3A00365015" target="_blank" >RIV/68407700:21220/22:00365015 - isvavai.cz</a>

Result on the web

<a href="http://147.32.168.15:8080" target="_blank" >http://147.32.168.15:8080</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

1-WP03-012 ZV: Optimized advanced pre-chamber design

Original language description

Optimized un-conventional active pre-chamber design and operation under low-carbon fuel operation (CNG, LNG). Its performance will be verified experimentally on a research ICE. The VarioTec (VaT) ignition chamber (IC) was installed for tests on a single cylinder engine 102/120 mm. In the first experimental campaign the effective scavenging of IC by air was tested successfully. Modification for the use of the series production spark plug is now in progress. IC design optimization was performed using CFD. For that purpose, three types of modelling were utilized. - Detailed 1-D CFD model of target ICE – optimization of layout and IC and boundary conditions (BC) for 3-D CFD. - Detailed 3-D CFD model of combustion chamber and intake/exhaust ports including advanced pre-chamber (5 consecutive cycles modeled to verify ICE performance). - Simplified 3-D CFD model (compression stroke and combustion phase only) for sensitivity studies and optimizations: Pre-chamber size, shape and space– this includes spark plug position and fuel nozzle size and space direction was investigated. Connecting channels (between pre-chamber and main combustion chamber) were optimized.

Czech name

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Czech description

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Type

G_funk - Functional sample

CEP classification

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OECD FORD branch

20301 - Mechanical engineering

Project

<a href="/en/project/TN01000026" target="_blank" >TN01000026: Josef Bozek National Center of Competence for Surface Vehicles</a><br>

Continuities

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

Publication year

2022

Confidentiality

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

Internal product ID

TN01000026/1-V31

Numerical identification

1-WP03-012 ZV

Technical parameters

Experiments carried out on engine test bed in 2022 show. VaT ignition chamber (IC) shows operability up to lambda = approx. 1.7, NOx emissions in raw exhaust gas are very close to a legislative limit, HC emissions issue remains – need for further improvement and oxidation catalyst. A slower late phase of combustion at lambda close to 1 also needs to be addressed in the future. Detailed 3-D CFD simulations were performed to find optimal thermodynamic design of combustion chamber with focus on fast combustion process. This includes active air scavenging and active gaseous fuel injection. Simplified optimizations/sensitivity studies were carried out to evaluate influence of different design and operational parameters (e.g., fuel injection timing, injected fuel amount/pressure, spark plug position, fuel injector position/shape, size/configuration of connecting channels). Complex automated optimization procedure/methodology was proposed (and put in operation).

Economical parameters

An advanced combustion system for ICEs with active P-C enables partial or complete transition to low carbon fuels and H2, significant improvement in engine efficiency, very near zero tail-pipe emissions, maintaining usability, well proven production technologies and minimizing unwanted societal impacts.

Application category by cost

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Owner IČO

68407700

Owner name

České vysoké učení technické v Praze / FS / centrum vozidel udržitelné mobility Josefa Božka

Owner country

CZ - CZECH REPUBLIC

Usage type

A - K využití výsledku jiným subjektem je vždy nutné nabytí licence

Licence fee requirement

A - Poskytovatel licence na výsledek požaduje licenční poplatek

Web page

http://147.32.168.15:8080