Visualization of auto-ignition of end gas region without knock in a spark-ignition natural gas engine

• Autorzy: Tomita E. , Kawahara N. , Zheng J.
• Języki publikacji: EN

Abstrakty

EN

It is important to increase thermal efficiency in a spark-ignition engine for reducing carbon dioxide gas in exhaust emissions. One of the solutions is to increase the compression ratio of the engine. Then, knock is a barrier in increasing in compression ratio because of higher pressure and unburned gas temperature in the end gas region. Therefore, there have been many studies on knock. However, there was an interesting phenomenon under some conditions in a gas engine. There is no pressure oscillation in the end stage of combustion and rate of heat release increased. It is considered that the auto-ignition in the end gas region occurs without knock. In this study, the combustion behavior in the end gas region was visualized with an ultra-high-speed camera. In normal combustion case, the flame propagates in the end gas region. In the knock case, the auto-ignited part burns suddenly and leads pressure oscillation. Under the critical conditions, some shows knock and some shows normal flame propagation. However, in some cases, even if auto-ignition occurs, pressure wave is not produced. Then there is no pressure oscillation, that is, mild auto-ignition without knock can be confirmed. And the rate of heat release shows two peaks. The first peak is due to flame propagation and the second peak is due to auto-ignition in the end gas region. The combustion near the end stage become short and thermal efficiency is expected to be increased because of increase in degree of constant-volume.

Słowa kluczowe

EN

knock; spark-ignition engine; homogeneous mixture; visualization; natural gas; End Gas Region

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2010
• Tom: Vol. 17, No. 4
• Strony: 521--527
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Tomita E.

autor

Kawahara N.

autor

Zheng J.

• Okayama University, Department of Mechanical Engineering Tsushima-Naka 3, Kita-Ku, Okayama, 700-8530 Japan tel: [phone], fax: [phone],

Bibliografia

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• [3] Livengood, J. C., Wu, P. C., Correlation of Autoignition Phenomena in Internal Combustion Engines and Rapid Compression Machines, 5th Symp. on Comb., pp. 347-356, 1955.
• [4] Kono, M., Shiga, S., Kumagai, S., Iimura, K., Thermodynamic and experimental determinations of knock intensity by using a spark-ignited rapid compression machine, Combust. Flame, 54, pp. 33-47, 1983.
• [5] Pilling, M. J., Low-Temperature Combustion and Autoignition, Elsevier Science, Amsterdam 1997.
• [6] Kawahara, N., Tomita, E., Sakata, Y., Auto-ignited kernels during knocking combustion in a spark-ignition engine, Proceedings of the Combustion Institute, Vol. 31, pp. 2999-3006, 2007.
• [7] Kawahara, N., Tomita, E., Visualization of Auto-ignition and Pressure Wave during Knocking in a Hydrogen Spark-Ignition Engine, Int. J. of Hydrogen Energy, Vol. 34, Is. 7, pp. 3156-3163, 2009.
• [8] Tomita, E., Fukatani, N., Kawahara, N., Maruyama, K., Komoda, T., Combustion Characteristics and Performance of Supercharged Pyrolysis Gas Engine with Micro-Pilot Ignition, 25th CIMAC World Congress on Combustion Engine Technology, Paper No. 178, 2007.
• [9] Tomita, E., Fukatani, N., Kawahara, N., Maruyama, K., Combustion in a supercharged biomass gas engine with micro-pilot ignition - Effects of injection pressure and amount of diesel fuel, Journal of KONES Powertrain and Transport, Vol. 14, No. 2, pp. 513-520, 2007.
• [10] Roy, M. M., Tomita, E., Kawahara, N., Harada, Y., Sakane, A., Performance and emission comparison of a supercharged dual-fuel engine fueled by producer gases with varying hydrogen content, Int. J.of Hydrogen Energy, Vol. 34, Is. 18, pp. 7811-7822, 2009.
• [11] Roy, M. M., Tomita, E., Kawahara, N., Harada, Y., Sakane, A., Performance and emissions of a supercharged dual-fuel engine fueled by hydrogen-rich coke oven gas, Int. J. of Hydrogen Energy, Vol. 34, Is. 23, pp. 9628-9638, 2009.