Abstract
In an attempt to promote the atomization of fuel spray and the mixing of fuel and air in diesel engines, a micro-hole nozzle which has orifices with a diameter smaller than 0.10 mm was developed. In this study, the combustion tests were carried out using a single cylinder diesel engine equipped with a micro-hole nozzle and a common rail type high-pressure fuel injection system. A comparison with the results of a conventional nozzle experiment showed that the peak of initial premixed combustion'increased, but the peak of diffusion combustion decreased. As a result, when nozzle orifice diameter become small from ø 0.15 mm to ø 0.10 mm, the combustion was accompanied by smokeless with the same levels of NOx emission and fuel economy. And results of a comparison the toroidal type chamber with the shallow dish type chamber revealed that the optimization of combustion chamber is necessary for the increase of the injection stage with increasing of the number of nozzle orifice. If an orifice diameter becomes ø 0.06 mm, the diffusion combustion can not be observed and the combustion is formed of only premixed combustion. The combustion in the case of ø 0.06 mm was accompanied with the drastic deterioration of fuel economy, smoke and HC with all over load. But the micro-hole nozzle has a potential for the formation of the lean and homogeneous premixed mixture until the fuel-air mixture ignites.
| Original language | English |
|---|---|
| Pages (from-to) | 1912 |
| Number of pages | 1 |
| Journal | Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B |
| Volume | 66 |
| Issue number | 647 |
| Publication status | Published - 2000 Jul |
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Keywords
- Diesel engine
- Emission
- High pressure fuel injection
- Micro-hole nozzle
- Spray injection angle
- Wall impinging
ASJC Scopus subject areas
- Mechanical Engineering
- Condensed Matter Physics
Cite this
Improvement of combustion in a direct injection diesel engine by micro-hole nozzle. / Murata, Minehiro; Kobori, Shigeharu; Iida, Norimasa.
In: Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 66, No. 647, 07.2000, p. 1912.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Improvement of combustion in a direct injection diesel engine by micro-hole nozzle
AU - Murata, Minehiro
AU - Kobori, Shigeharu
AU - Iida, Norimasa
PY - 2000/7
Y1 - 2000/7
N2 - In an attempt to promote the atomization of fuel spray and the mixing of fuel and air in diesel engines, a micro-hole nozzle which has orifices with a diameter smaller than 0.10 mm was developed. In this study, the combustion tests were carried out using a single cylinder diesel engine equipped with a micro-hole nozzle and a common rail type high-pressure fuel injection system. A comparison with the results of a conventional nozzle experiment showed that the peak of initial premixed combustion'increased, but the peak of diffusion combustion decreased. As a result, when nozzle orifice diameter become small from ø 0.15 mm to ø 0.10 mm, the combustion was accompanied by smokeless with the same levels of NOx emission and fuel economy. And results of a comparison the toroidal type chamber with the shallow dish type chamber revealed that the optimization of combustion chamber is necessary for the increase of the injection stage with increasing of the number of nozzle orifice. If an orifice diameter becomes ø 0.06 mm, the diffusion combustion can not be observed and the combustion is formed of only premixed combustion. The combustion in the case of ø 0.06 mm was accompanied with the drastic deterioration of fuel economy, smoke and HC with all over load. But the micro-hole nozzle has a potential for the formation of the lean and homogeneous premixed mixture until the fuel-air mixture ignites.
AB - In an attempt to promote the atomization of fuel spray and the mixing of fuel and air in diesel engines, a micro-hole nozzle which has orifices with a diameter smaller than 0.10 mm was developed. In this study, the combustion tests were carried out using a single cylinder diesel engine equipped with a micro-hole nozzle and a common rail type high-pressure fuel injection system. A comparison with the results of a conventional nozzle experiment showed that the peak of initial premixed combustion'increased, but the peak of diffusion combustion decreased. As a result, when nozzle orifice diameter become small from ø 0.15 mm to ø 0.10 mm, the combustion was accompanied by smokeless with the same levels of NOx emission and fuel economy. And results of a comparison the toroidal type chamber with the shallow dish type chamber revealed that the optimization of combustion chamber is necessary for the increase of the injection stage with increasing of the number of nozzle orifice. If an orifice diameter becomes ø 0.06 mm, the diffusion combustion can not be observed and the combustion is formed of only premixed combustion. The combustion in the case of ø 0.06 mm was accompanied with the drastic deterioration of fuel economy, smoke and HC with all over load. But the micro-hole nozzle has a potential for the formation of the lean and homogeneous premixed mixture until the fuel-air mixture ignites.
KW - Diesel engine
KW - Emission
KW - High pressure fuel injection
KW - Micro-hole nozzle
KW - Spray injection angle
KW - Wall impinging
UR - http://www.scopus.com/inward/record.url?scp=71249151591&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=71249151591&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:71249151591
VL - 66
SP - 1912
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
SN - 0387-5016
IS - 647
ER -