FARKLI ORANLARDA İZOOKTAN-DİZEL YAKITI İLE BESLENEN BİR RCCI MOTORUNUN MOTOR PERFORMANSI VE EMİSYONLARI ÜZERİNE DENEYSEL BİR ÇALIŞMA

Yıl 2024, Cilt: 11 Sayı: 23, 352 - 362, 31.08.2024

Müjdat Fırat , Mutlu Okcu , Yasin Varol

https://doi.org/10.54365/adyumbd.1459930

Öz

Yapılan çalışmada deney motoru, modifiye edilerek RCCI konseptine göre çalışır hale getirilmiş tek silindirli dizel motordur. HRF olarak dizel ve LRF olarak ta izooktan (%15, %30, %45 ve %60 karışım oranlarında) kullanılmıştır. Deneyler üç farklı yükte (%20, %40 ve %60) ve 2400 (d/d) sabit motor devrinde gerçekleştirilmiştir. %20 yükte basınç pik değerinde LRF kullanımı ile önemli bir değişim olmamakla birlikte, motor yükü ve LRF karışım oranı arttıkça basınç ve HRR pik değeri artmış, bu değerlerin oluştuğu krank açısı ilerlemiştir. Motor performansı için önemli olan OİB’de LRF oranına bağlı olarak kısmi azalmalar görülmesine rağmen, %15 LRF oranı kullanımının tüm yüklerde OİB’nin dizel yakıtlı deneyde oluşan değerle hemen hemen aynı seviyede oluştuğu belirlenmiştir. LRF kullanımı ile düşük yükte NOx emisyonu, yüksek yükte CO emisyonu başarılı bir şekilde azaltılırken, HC emisyonu tüm deneylerde artış göstermiştir. Duman opaklığı tüm yük deneylerinde LRF ile azaltılırken, en büyük azalma %60 yükte yaklaşık olarak %97 oranında gerçekleşmiştir.

Anahtar Kelimeler

RCCI, Emisyon, İzooktan, Yüksek oktanlı yakıt, Dizel motor

Etik Beyan

Çalışmada etik beyan bulunmamaktadır.

Destekleyen Kurum

Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)

Proje Numarası

118M650

Teşekkür

Bu çalışma Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK) (proje no.118M650) tarafından desteklenmiştir

AN EXPERIMENTAL STUDY ON ENGINE PERFORMANCE AND EMISSIONS OF A RCCI ENGINE FUELLED WITH DIFFERENT RATIOS OF ISOOCTANE-DIESEL FUEL

Öz

In the conducted study, a single-cylinder diesel engine was modified to operate according to the RCCI concept. Diesel was used as HRF and isooctane (in mixture ratios of 15%, 30%, 45%, and 60%) as LRF. Experiments were conducted at three different loads (20%, 40%, and 60%) and at a constant engine speed of 2400 rpm. While there was no significant change in the peak pressure value with the use of LRF at 20% load, as the engine load and LRF mixture ratio increased, both pressure and HRR peak value increased, and these values occurred at an advanced crank angle. Although partial decreases depending on the LRF ratio were observed in the IMEP, which is important for engine performance, it was determined that the use of 15% LRF ratio resulted in IMEP levels almost similar to those obtained in diesel-fueled experiments at all loads. With the use of LRF, NOx emissions were successfully reduced at low loads, and CO emissions were reduced at high loads, while HC emissions increased in all experiments. Smoke opacity was reduced with LRF at all load experiments, with the greatest reduction occurring at 60% load, approximately by 97%.

Anahtar Kelimeler

RCCI, Isooctane, Emissions, Diesel engine, High octane fuel

Proje Numarası

118M650

Kaynakça

• Feng H, Chen X, Sun L, Ma R, Zhang X, Zhu L, et al. The effect of methanol/diesel fuel blends with co-solvent on diesel engine combustion based on experiment and exergy analysis. Energy 2023;282:128792. https://doi.org/10.1016/j.energy.2023.128792.
• Fırat M, Altun Ş, Okcu M, Varol Y. Experimental investigation on combustion and emission characteristics of reactivity controlled compression ignition engine powered with iso-propanol/biodiesel blends. Propuls Power Res 2022;11:224–39.
• Yin X, Li W, Duan H, Duan Q, Kou H, Wang Y, et al. A comparative study on operating range and combustion characteristics of methanol/diesel dual direct injection engine with different methanol injection timings. Fuel 2023;334:126646. https://doi.org/10.1016/j.fuel.2022.126646.
• Fırat M, Altun Ş, Okcu M, Varol Y. Comparison of ethanol/diesel fuel dual direct injection (DI2) strategy with reactivity controlled compression ignition (RCCI) in a diesel research engine. Energy 2022;255:124556.
• Öztürk G, Tanyeri B, Öner C. Investigation of effects on fuel consumption and exhaust emissions by using bioethanol gasoline mixture in an engine with ultrasonic fuel system. Therm Sci 2023:163–163.
• Poorghasemi K, Saray RK, Ansari E, Irdmousa BK, Shahbakhti M, Naber JD. Effect of diesel injection strategies on natural gas/diesel RCCI combustion characteristics in a light duty diesel engine. Appl Energy 2017;199:430–46. https://doi.org/10.1016/j.apenergy.2017.05.011.
• Ouchikh S, Lounici MS, Loubar K, Tarabet L, Tazerout M. Effect of diesel injection strategy on performance and emissions of CH4/diesel dual-fuel engine. Fuel 2022;308:121911.
• Fırat M, Coşkun N, Okcu M, Varol Y. Numerical investigation of regeneration process of diesel particulate filter (DPF) made of different constitutive materials. J Fac Eng Archit Gazi Univ 2019;34.
• Xu L, Xu S, Bai X-S, Repo JA, Hautala S, Hyvönen J. Performance and emission characteristics of an ammonia/diesel dual-fuel marine engine. Renew Sustain Energy Rev 2023;185:113631. https://doi.org/10.1016/j.rser.2023.113631.
• Duan H, Jia M, Chang Y, Liu H. Experimental study on the influence of low-temperature combustion (LTC) mode and fuel properties on cyclic variations in a compression-ignition engine. Fuel 2019;256:115907.
• Chaudhari VD, Deshmukh D. Diesel and diesel-gasoline fuelled premixed low temperature combustion (LTC) engine mode for clean combustion. Fuel 2020;266:116982.
• Okcu M, Varol Y, Altun Ş, Fırat M. Effects of isopropanol-butanol-ethanol (IBE) on combustion characteristics of a RCCI engine fueled by biodiesel fuel. Sustain Energy Technol Assess 2021;47:101443. https://doi.org/10.1016/j.seta.2021.101443.
• Deb P, Paul A. Advancing RCCI engine performance via optimal acetylene premix ratios and advanced diesel injection timing: An experimental investigation. Environ Prog Sustain Energy n.d.;n/a:e14375. https://doi.org/10.1002/ep.14375.
• Elbanna AM, Cheng X, Yang C, Elkelawy M, Bastawissi HA-E, Xu H. Statistical analysis of ethanol/diesel dual-fuel combustion of compression ignition engines in RCCI mode using multi-injection strategies. Sustain Energy Fuels 2023;7:2749–63. https://doi.org/10.1039/D3SE00299C.
• Zou X, Wang H, Zheng Z, Reitz R, Yao M. Numerical Study of the RCCI Combustion Processes Fuelled with Methanol, Ethanol, n-Butanol and Diesel. Warrendale, PA: SAE International; 2016. https://doi.org/10.4271/2016-01-0777.
• Pan S, Li X, Han W, Huang Y. An experimental investigation on multi-cylinder RCCI engine fueled with 2-butanol/diesel. Energy Convers Manag 2017;154:92–101. https://doi.org/10.1016/j.enconman.2017.10.047.
• Mutlu Okcu. Experimentally and Numerically Investigation of Combustion Characteristics and Pollutant Emissions at Low Temperature Combustion in RCCI Engine. PhD. Fırat University, 2021.
• Tang Q, Liu H, Ran X, Li M, Yao M. Effects of direct-injection fuel types and proportion on late-injection reactivity controlled compression ignition. Combust Flame 2020;211:445–55. https://doi.org/10.1016/j.combustflame.2019.10.018.
• Cinar C, Uyumaz A, Solmaz H, Sahin F, Polat S, Yilmaz 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 2015;130:275–81. https://doi.org/10.1016/j.fuproc.2014.10.026.