RCCI BİR MOTORDA ENJEKSİYON ZAMANLAMASI VE LAMDANIN YANMA VE PERFORMANS KARAKTERİSTİKLERİ ÜZERİNDEKİ ETKİLERİNİN DENEYSEL İNCELENMESİ

Bu çalışmada, dört zamanlı, dört silindirli, direkt püskürtmeli reaktif kontrollü sıkıştırma ile ateşlemeli (RCCI) bir motorda enjeksiyon zamanlaması ve lamdanın yanma ve performans karakteristikleri üzerindeki etkileri deneysel olarak incelenmiştir. Bu amaçla direkt püskürtmeli RCCI motorda porttan izooktan yakıtı, direkt silindir içerisine n-heptan yakıtı ÜÖN’dan 100, 80, 60, 50, 40, 30, 20 °KA önce püskürtülerek RCCI yanması üzerindeki etkileri araştırılmıştır. Tam yükte, 1000 d/d’da, 40 °C emme havası giriş sıcaklığında, sabit supap zamanlamasında ve farklı lamda değerlerinde (λ=2.2, λ=1.9, λ=1.7) yapılan deneylerde enjeksiyon zamanlaması avansa alındıkça maksimum silindir içi basıncın daha erken elde edildiği ve arttığı görülmüştür. Aynı zamanda, lamda azaldıkça maksimum silindir basıncının ve ısı dağılımının arttığı gözlemlenmiştir. Enjeksiyon zamanlaması avansa alındıkça indike termik verim belli bir değere kadar artış göstermiş, daha fazla avansa alındığında indike termik verimdeki artış azalmıştır. Maksimum indike termik verim % 42.47 ile 80°KA enjeksiyon zamanlaması ile λ=2.2 değerinde elde edilmiştir.

Anahtar Kelimeler:

Reaktif kontrollü sıkıştırma ile ateşlemeli yanma, Yanma, Enjeksiyon zamanlaması, Yanma verimi, Lamda

PDF

___

Uyumaz, A., ‘’An experimental investigation into combustion and performance characteristics of an HCCI gasoline engine fueled with n-heptane, isopropanol and n-butanol fuel blends at different inlet air temperatures’’, Energy Conversion and Management, 98:199–207, (2015).
Çınar, C., Uyumaz, A., Polat, S., Yılmaz, E., Can, Ö., Solmaz, H., ‘’Combustion and performance characteristics of an HCCI engine utilizing trapped residual gas via reduced valve lift’’, Applied Thermal Engineering, 100: 586–594, (2016).
Cinar, C., Uyumaz, A., Solmaz, H., Sahin, F., Polat, S., Yılmaz, E., ‘’Effects of intake air temperature on combustion, performance and emission characteristics of a HCCI engine fueled with the blends of 20% n-heptane and 80% isooctane fuels’’, Fuel Process Technol, 130:275–81, (2015).
Cinar, C., Uyumaz, A., Solmaz, H., Topgül, T.,‘’Effects of valve lift on the combustion and emissions of a HCCI gasoline engine’’ Energy Conversion and Management 94: 159–168, (2015).
Zhang, Y., He, BQ., Xie, H., Zhao, H., ‘’The combustion and emission characteristics of ethanol on a port fuel injection HCCI engine’’, SAE International Technical Papers, 2006-01-0631.
He, B-Q., Yuan, J., Liu M-B, Zhao H.,’’Combustion and emission characteristics of a n-butanol HCCI engine’’, Fuel, 115:758–64, (2014).
Godino, JAV, Garcia, MT, Aguilar, FJJ-E, Trujillo EC., ‘’Numerical study of HCCI combustion fueled with diesel oil using a multizone model approach’’, Energy Conversion and Management, 89:885–95, (2015).
Yang, C, Zhao, H. ‘’Naturally aspirated and boosted controlled auto-ignition combustion with positive valve overlap in a four-stroke gasoline engine’’, Int J Engine Res, 14:496-511, (2013).
Kim, MY, Lee, JH, Lee, CS., ‘’Combustion characteristics and NOx emissions of a dimethyl-ether-fueled premixed charge compression ignition engine’’, Energy Fuels 22:4206-12 ,(2008).
Liu, HF., Xu, J., Zheng, ZQ, Li, SJ, Yao, MF., ‘’Effects of fuel properties on combustion and emissions under both conventional and low temperature combustion mode fueling 2,5-dimethylfuran/diesel blends’’, Energy, 62:215-23, (2013).
Kokjohn, SL, Hanson, RM, Splitter, DA, RD., ‘’Experiments and modeling of dual-fuel HCCI and PCCI combustion using in-cylinder fuel blending’’, SAE; 2009. paper 2009-01-2647.
Kokjohn, S.L., Hanson, R.M., Splitter, D.A., Reitz, R.D., ‘’Experiments and modeling of dual-fuel HCCI and PCCI combustion using in-cylinder fuel blending’’, SAE Int. J. Engines (2009), 2009-01-2647.
Hanson, R.M., Kokjohn, S. L., Splitter, D.A., Reitz, R.D., ‘’An experimental investigation of fuel reactivity controlled PCCI combustion in a heavy-duty engine’’, SAE Int. J. Engines (2010), 2010-01-0864.
Papagiannakis, R.G., Hountalas, D.T., ‘’Experimental investigation concerning the effect of natural gas percentage on performance and emissions of a DI dual fuel diesel engine’’, Appl. Therm. Eng. 23 (3) (February 2003) 353-365.
Liu,J., Yang, F.,Wang, H., Ouyang, M., ‘’Numerical study of hydrogen Addition to DME/CH4 dual fuel RCCI engine’’, International Journal of Energy, 37, 8688-8697, (2012).
Saxena, S., Bedoya, I.D., ‘’Fundamental phenomena affecting low temperature combustion and HCCI engines, high load limits and strategies for extending these limits’’, Progress in Energy and Combustion Science, 39, 457-488, (2013).
Benajes, J., Molina, S., García, A., Belarte, E., Vanvolsem, M., ‘’An investigation on RCCI combustion in a heavy duty diesel engine using in-cylinder blending of diesel and gasoline fuels’’, Applied Thermal Engineering, 63, 66-76, (2014).
Liu, H., Wang, X., Zheng, Z., Gu, J., Wang, H., Yao, M., ‘’Experimental and simulation investigation of the combustion characteristics and emissions using n- utanol/biodiesel dual-fuel injection on a diesel engine’’, Energy, in-press,(2014) 1-12.
Li, Y., Jia, M., Chang, Y., Liu, Y., Xie, M., Wang, T., Zhou, L., ‘’Parametric study and optimization of a RCCI (reactivity controlled compression ignition) engine fueled with methanol and diesel’’, Energy 65, 319-332, (2014).
Reitz, R.D., Duraisamy, G., ‘’Review of high efficiency and clean reactivity controlled compression ignition (RCCI) combustion in internal combustion engines’’, Progress in Energy and Combustion Science, in-press, (2014) 1-60.
Dempsey, A., Walker, N., Gingrich, E., Reitz, RD., ‘’Comparison of low temperature combustion strategies for advanced compression ignition engines with a focus on controllability’’, Combust Sci Technol , 86(2):210-41 , (2014).
Zhao, H., HCCI and CAI engines for the automotive industry. Cambridge England: Woodhead Publishing Ltd; (2007).
Heywood, J. B., “Internal combustion engine fundamentals”, New York: McGraw- Hill; (1988).
Stone, R., Introduction to Internal Combustion Engines, 1999;Macmillan Press Ltd, ISBN 0-333-74013- 0,Tesseraux, I.; Toxicoll, Lett., 2004, 149, 295-300.
Polat, S., Kannan, K., Shahbakhti, M., Uyumaz, A., Yücesu, H.S., An Experimental Study for the Effects of Supercharging On Performance and Combustion of an Early Direct Injection HCCI Engine, Second International reserch conference on Engineering, science and management, Dubai, 2015.
Çınar, C., Uymaz, A., Polat, S., Solmaz, H., Yılmaz, E.,Influence of Residual Gas Fraction on Performance and Combustion Characteristics in HCCI Engine with Reduced Valve Lift, Second International research conference on Engineering, science and management, Dubai, 2015.
Anonymous, 2,2,4-2-2-4Trimethylpentane-compound summary, PubChem Compound. USA: National Center for Biotechnology Information26 March Identification and Related Records, 2005 (Retrieved March 2012).
Tsurushima, T., ‘’A new skeletal PRF kinetic model for HCCI combustion’’, Proceedings of the Combustion Institute, 32: 2835-2841, (2009).
Amano, T., Morimoto, S., Kawabata, Y., ‘’Modeling of the Effect of Air/Fuel Ratio and Temperature Distribution on HCCI Engines’’, SAE Technical Paper 2001-01-1024, 2001.
Sjöberg, M., Edling, L., Eliassen, T., Magnusson, L., Angstrm, H., ‘’GDI HCCI: Effects of Injection Timing and Air Swirl on Fuel Stratification, Combustion and Emissions Formation’’, SAE Technical Paper 2002-01-0106, 2002.