A recognised way of improving engine fuel consumption is through the use of high dilution, either lean burn or exhaust gas recirculation (EGR), but conventional engines can only tolerate small amounts of excess air or EGR while maintaining stable operation. A port-injected SI (spark-ignition) engine was modified to improve the dilution tolerance, and hence reduce the fuel consumption, through air motion control. Strong axial and barrel swirl was generated by preventing air flow through one valve, thus giving optimum air motion at the spark plug. Fuel consumption reduction through lean burn improved from 7 % to 11 %; with EGR it improved from 3 % to 7 %. The system was tested at different swirl ratios but there was insufficient time for a full optimisation program. Analysis of air motion using hot-wire anemometry showed that the correct combination of high turbulence and low bulk motion was the key to its operation.
High dilution combustion through axial and barrel swirl
Magergemischverbrennung durch Axial- und Drallströmung
1997
10 Seiten, 10 Bilder, 2 Quellen
Conference paper
English
Kraftstoffeinsparung , Magermischmotor , Abgasrückführung , Direkteinspritzung , Einspritzmotor , Luftbewegung , mechanische Regelung , Zündkerze , Kraftstoffverbrauch , Wirbelströmung , Axialströmung , Luftströmung , Hitzdrahtanemometer , Turbulenz , Wechselwirkung , Automobilindustrie , Kraftfahrzeug , Drallströmung
High dilution combustion through axial and barrel swirl
British Library Conference Proceedings | 1997
|High dilution combustion through axial and barrel swirl
Automotive engineering | 1997
|Numerical study on swirl-type high-dilution stratified EGR combustion system
Automotive engineering | 2000
|Numerical Study on Swirl-Type High-Dilution Stratified EGR Combustion System
SAE Technical Papers | 2000
|