Troels Dyhr Pedersen.indd - Solid Mechanics

CONCLUSION
• It was possible to achieve values 4.5 to 5 Bars
of IMEP both lambda 2.5 and 3, and around 3.5
Bars of IMEP for lambda 4.
• Indicated efficiencies of up to 40 and 45
percent could be achieved with lambda 3 and 4
respectively, whereas lambda 2.5 resulted in
indicated efficiencies up to 35 percent
• The best engine performance with acceptable
amplitude of knock was achieved with the leanest
charge at 3000 RPM. The combustion delay and
low pressure rise rates resulted in a high efficiency,
low noise and high IMEP
• It was found that the different equivalence
ratios used required that the compression ratio was
within narrow limits to avoid knock and achieve
optimum performance. A compression ratio of
approx. 9.2 was found suitable for both lambda 2.5
and lambda 3, while a compression ratio of approx.
11 was required to operate with lambda 4.
• Increasing engine speed generally increases
the engine knock. The amplitude of knock was
generally unacceptable at 3000 RPM with lambda
2.5
• Emissions of CO and THC are generally low,
except for lambda 4 which produced relatively large
emission levels of CO compared to the richer
mixtures.
REFERENCES
1. Zunqing Zheng, Chuntao Shi, Mingfa Yao.
Experimental study on Dimethyl Ether
Combustion Process in Homogeneous Charge
Compression Ignition Mode. Transactions of
Tianjin University, Vol. 10, No. 4, Dec. 2004
2. Hu Tiegang, Liu Shenghua, Zhou Longbao, Zhu
Chi. Combustion and emission characteristics
of a homogeneous charge compression ignition
engine. Proceedings of the Institution of
Mechanical Engineers, journal of Automobile
engineering, Vol. 219, p. 1133-1139. 2005
3. Hu Tiegang, Liu Shenghua, Zhou Longbao, Li
Wei. Effects of compression ratio on
performance, combustion, and emission
characteristics on an HCCI engine.
Proceedings of the Institution of Mechanical
Engineers, Journal of Automobile engineering,
Vol. 220, p. 637-645. 2006
4. Keisuke Hamada, Shun Niijima, Kazunori
Yoshida, Koji Yoshida, Hideo Shoji, Kazuto
Shimada, Kenji Shibano. The effects of the
Compression Ratio, Equivalence Ratio, And
Intake Air Temperature on Ignition Timing in an
HCCI Engine using DME Fuel. SAE paper
2005-32-002.
5. Masato Ikemoto, Yuichiro Kojima, Norimasa
Lida. Development of the Control System using
EGR for the HCCI Engine running on DME.
SAE paper 2005-32-0062.
6. Tetsuo Ohmura, Masato Ikemoto, Norimasa
Lida. A Study on Combustion Control by using
Internal and External EGR for HCCI Engines
Fuelled with DME. SAE paper 2006-32-0045
7. Hiroyuki Yamada, Masataka Yoshii, Atsumu
Tezaki. Chemical mechanistic analysis of
additive effects in homogeneous charge
compression ignition of dimethyl ether.
Proceedings of the Combustion Institute, Vol.
30, no. 2, pp. 2773-2780. 2004
8. Hideyuki Ogawa, Noboru Miyamoto, Naoya
Kaneko, Hirokazu Ando. Combustion Control
and Operating Range Expansion with Direct
Injection of Reaction Suppressors in a
Premixed DME HCCI Engine. SAE paper 2003-
01-0746.
9. Zunqing Zheng, Mingfa Yao, Zheng Chen, Bo
Zhang. Experimental Study on HCCI
Combustion of Dimethyl Ether (DME) /Methanol
Dual Fuel. SAE paper 2004-01-2993
10. Mingfa Yao, Zunqing Zheng, Jin Qin.
Experimental Study on Homogeneous Charge
Compression Ignition Combustion With Fuel of
Dimethyl Ether and Natural Gas. Transactions
of ASME, Vol. 128, p.414-420, 2006.
11. Susumu Sato, Daesu Jun, Soonpyo Kweon,
Daisuke Yamashita, Norimasa Lida. Basic
Research on the Suitable Fuel for HCCI Engine
from the Viewpoint of Chemical Reaction. SAE
paper 2005-01-0149.
12. T. Shudo, Y. Ono, T. Takahashi. Ignition
Control by DME-Reformed Gas in HCCI
combustion of DME. SAE paper 2003-01-1824
13. Mingfa Yao, Jin Qin, Zunqing Zheng. Numerical
study of the combustion mechanism of a
homogenous charge compression ignition
engine fuelled with dimethyl ether and methane,
with a detailed kinetics model. Part 1: the
raction kinetics of dimethyl ether. Proceedings
of the Institution of Mechanical Engineers,
journal of Automobile engineering, Vol. 219, p.
1213-1223. 2005
14. Andreas Vressner, Andreas Lundin, Magnus
Christensen, Per Tunestal, Bengt Johansen.
Pressure Oscillations During Rapid Hcci
Combustion. SAE paper 2003-01-3217
15. Tadashi Tsurushima, Yasuo Asaumi, Yuzo
Aoyagi: The Effect of Knock on Heat Loss in
Homogeneous Charge Compression Ignition
Engines. SAE paper 2002-01-0108
16. Jesper Schramm, Spencer C. Sorensen. A
Model for Hydrocarbon Emissions from SI
Engines. SAE paper 902169.
17. M. Lida, T. Aroonsrisopon, M. Hayashi, D.
Foster, J. Martin. The Effect of Intake Air
Temperature, Compression Ratio and Coolant
Temperature on the Start of Heat Release in
An HCCI (Homogeneous Charge Compression
Ignition) Engine. SAE paper 2001-01-1880
CONTACT
Troels Dyhr Pedersen
Nils Koppels Alle, Building 402, 1.st floor
Technical University of Denmark
2800 Kgs. Lyngby, Denmark
Email: tdp@mek.dtu.dk