Author:
Riccardi Marco,De Bellis Vincenzo,Sforza Lorenzo,Tunestal Per,Bozza Fabio,Beatrice Carlo,Lucchini Tommaso
Abstract
<div class="section abstract"><div class="htmlview paragraph">Increasingly stringent pollutant and CO<sub>2</sub> emission standards require the car manufacturers to investigate innovative solutions to further improve the fuel economy and environmental impact of their fleets. Nowadays, NO<sub>x</sub> emissions standards are stringent for spark-ignition (SI) internal combustion engines (ICEs) and many techniques are investigated to limit these emissions. Among these, an extremely lean combustion has a large potential to simultaneously reduce the NO<sub>x</sub> raw emissions and the fuel consumption of SI ICEs. Engines with pre-chamber ignition system are promising solutions for realizing a high air-fuel ratio which is both ignitable and with an adequate combustion speed.</div><div class="htmlview paragraph">In this work, the combustion characteristics of an active pre-chamber system are experimentally investigated using a single-cylinder research engine. The engine under exam is a large bore heavy-duty unit with an active pre-chamber fuelled with compressed natural gas.</div><div class="htmlview paragraph">In first stage, an experimental campaign was carried out for four different conditions of load and air/fuel ratio, at the same engine speed, then a 3D CFD analysis was realised to evaluate the in-cylinder turbulence and pre-chamber pressure traces. Global engine operating parameters as well as cylinder pressure traces, inside main combustion chamber and pre-chamber, were recorded and analysed. Based on the available 3D and experimental data, a phenomenological model of this unconventional combustion system is developed and validated.</div><div class="htmlview paragraph">The model is implemented in a commercial 1D code. The proposed numerical approach shows the ability to simulate the experimental data with good accuracy, with no case-dependent tuning. The model demonstrates to correctly describe the behaviour of a pre-chamber combustion system under the four operating conditions and to capture the physics behind such an innovative combustion system concept.</div></div>
Reference37 articles.
1. Roethlisberger , R. and
Favrat , D.
Comparison between Direct and Indirect (Prechamber) Spark Ignition in the Case of a Cogeneration Natural Gas Engine, Part I: Engine Geometrical Parameters Applied Thermal Engineering 22 11 2002 1217 1229 10.1016/S1359-4311(02)00040-6
2. Sens , M. ,
Binder , E. ,
Benz , A. ,
Kramer , L. ,
et al.
Pre-Chamber Ignition as a Key Technology for Highly Efficient SI Engines-New Approaches and Operating Strategies 39th International Vienna Motor Symposium Apr. 2018
3. Roethlisberger , R.P. and
Favrat , D.
Investigation of the Prechamber Geometrical Configuration of a Natural Gas Spark Ignition Engine for Cogeneration: Part II. Experimentation International Journal of Thermal Sciences 42 2003 239 253 10.1016/S1290-0729(02)00024-8
4. Geiger , J. ,
Pischinger , S. ,
Böwing , R. ,
Koß , H.J.
et al.
Ignition Systems for Highly Diluted Mixtures in SI Engines SAE Technical Paper 1999-01-0799 1999 https://doi.org/10.4271/1999-01-0799
5. Mueller , C. ,
Morcinkowski , B. ,
Habermann , K. ,
Uhlmann , T.
et al.
Development of a Pre-Chamber for Spark Ignition Engines in Vehicle Applications 4th International Conference on Ignition Systems for Gasoline Engines Dec. 2018
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献