Computational investigation of compression ratio and bore diameter influence on engine performance and knock intensity

• Autorzy: Gandyk M. , Haller P. , Jankowski A.

Identyfikatory

DOI

10.5604/01.3001.0012.2788

• Języki publikacji: EN

Abstrakty

EN

Processes of the combustion in combustion engines depend on cylinder bore and compression ratio. Compression ratio is a ratio of in-cylinder volume when piston is in bottom dead centre to volume when piston is in top dead centre. Theoretical engine efficiency is increasing together with compression ratio. However, in the real engine there are also other phenomena affecting the efficiency of the engine, which could results in lower performance of engine with higher compression ratio. This study presents knock intensity and performance gain in engine speed function of the 0D-1D engine model with different pistons set. Knock intensity is founded by implementing in combustion process knock sub-model based on Douaud and Eyzat induction time correlation using different pistons geometry. Examined engine model is air restricted Formula Student motorcycle engine. Mounted in intake system, air restrictor decreases knock intensity. Therefore, compression ratio could be increased. It was noticed that bigger bore diameter could reduce knock intensity. Researches realized that bigger bore size could cause performance drop at high rpm when flow is chocked. With changing of compression ratio, performance characteristic changes. Growing compression ratio decrease torque on low engine speed and increase on high engine speed. Further characteristic of the engine could be tuned by matching pistons with modified bore size and compression ratio.

Słowa kluczowe

EN

simulation; combustion engines; compression ratio; motor sport; engine performance; knocks

• 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: 2018
• Tom: Vol. 25, No. 2
• Strony: 129--134
• Opis fizyczny: Bibliogr. 9 poz., rys.

Twórcy

autor

Gandyk M.

• Wroclaw University of Technology Department of Mechanical Engineering, PWR Racing Team Braci Gierymskich 164, 51-640 Wroclaw, Poland tel.: [phone]

autor

Haller P.

• Wroclaw University of Technology Department of Mechanical Engineering Braci Gierymskich 164, 51-640 Wroclaw, Poland tel.: [phone]

autor

Jankowski A.

• Institute of Aviation Krakowska Ave. 110/114, 02-256 Warsaw, Poland tel.: [phone], fax: [phone]

Bibliografia

• [1] Carris, D., Nelson, E., A new look at High Compression Engines, SAE Technical Paper 590015, 195.
• [2] Douaud, A. M., Eyzat, P., Four-octane-number method for predicting the anti-knock behavior of fuels and engines, SAE Paper 780080, 1978.
• [3] Heywood, J. B., Internal Combustion Engines Fundamentals, McGraw-Hill, Inc., 1988.
• [4] Olczyk, A., Analiza możliwości zwiększania mocy tłokowych silników, Cieplne Maszyny Przepływowe, No. 141, Lodz 2012.
• [5] Ricardo WAVE 2015.2 Help System.
• [6] Stone, R., Introduction to internal combustion engines – 4th edition, SAE International, Warrendale, Pensylwania, USA 2012.
• [7] Wajand, J., A., Wajand, J. T., Tłokowe silniki spalinowe średnio- i szybkoobrotowe, WNT, Warszawa 2005.
• [8] Jankowski, A., Heat transfer in combustion chamber of piston engines, Journal of KONES 2010 Powertrain and Transport, Vol. 17, No. 1, pp. 351-358, Warsaw 2010.
• [9] Jankowski, A., Laser research of fuel atomization and combustion processes in the aspect of exhaust gases emission, Journal of KONES 2008 Powertrain and Transport, Vol. 15, No. 1, pp. 119-126, Warsaw 2008.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).