Analisa Pengaruh Exhaust Gas Recirculation (EGR) Pada Performa dan Emisi Mesin Diesel Berbahan Bakar Ganda Menggunakan Strategi Gas Split Injection

Rahmatullah, Dimas Tegar (2019) Analisa Pengaruh Exhaust Gas Recirculation (EGR) Pada Performa dan Emisi Mesin Diesel Berbahan Bakar Ganda Menggunakan Strategi Gas Split Injection. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Strategi bahan bakar ganda/dual fuel (DF) pada mesin diesel dapat memperbaiki karakteristik emisi, khususnya emisi NOx dan PM. Namun, dalam penerapannya mesin diesel DF memiliki beberapa kekurangan, seperti menurunnya performa dan tingginya emisi HC dan CO khususnya pada beban rendah. Strategi split injection dan exhaust gas recirculation (EGR) digunakan dalam penelitian ini. Split injection merupakan strategi injeksi bertahap bahan bakar yang dapat memperbaiki kualitas campuran. Sedangkan EGR merupakan strategi untuk mensirkulasi ulang sebagian gas buang ke dalam saluran intake sehingga dapat dibakar kembali pada siklus berikutnya. Dari penerapan kedua strategi tersebut kemudian akan dilihat pengaruhnya terhadap performa dan emisi mesin. Penelitian ini dilakukan dengan metode analisa numerik dan eksperimen. Pemodelan sistem dilakukan dan kemudian disimulasi. Eksperimen dilakukan untuk menguji modifikasi pada mesin diesel. Dari analisa data yang dilakukan dapat diketahui bahwa penerapan strategi ini menyebabkan peningkatan performa mesin. Hasil performa terbaik didapat dengan kapasitas EGR 20%. Daya, torsi, BMEP dan efisiensi termal meningkat serta SFOC menurun pada beban rendah hingga menengah. Dengan kapasitas EGR 20%, peningkatan daya, torsi dan BMEP terbesar sekitar 3,7% terjadi pada beban 50%. Peningkatan terbesar efisiensi termal sekitar 16,2% terjadi pada beban 75%. Sedangkan penurunan terbesar SFOC sekitar 15,3% terjadi pada beban 75%. Dari segi emisi, strategi ini menyebabkan penurunan emisi NO dan HC, sedangkan emisi CO meningkat. Hasil emisi terbaik didapat dengan kapasitas EGR 15%. Emisi NO menurun di semua rentang beban. Penurunan terbesar yaitu sekitar 93% terjadi pada beban tinggi dengan kapasitas EGR 15%. Emisi HC menurun pada beban rendah hingga menengah. Penurunan terbesar yaitu sekitar 22,3% terjadi pada beban rendah dengan kapasitas EGR 15%. Sedangkan emisi CO, rata-rata meningkat di semua rentang beban.
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Dual fuel strategy (DF) in diesel engine is able to improve emission characteristic, especially NOx and PM emissions. Unfortunately, in its application, DF diesel engine have several problems, such as reduced performance and high HC and CO, especially at low loads. The split injection and exhaust gas recirculation (EGR) strategies was used in this study. Split injection is a multiple fuel injection that can improve mixture quality, while EGR is a strategy to recirculate a portion of the exhaust gas into the intake manifold so that the exhaust gas will be re-burning. The effects on engine performance and emissions will be seen from the application of those two strategies. In this study was carried out by numerical analysis and experimental methods. System modeling is made and simulated, then the experiment was conducted to test modifications in diesel engines. It can be seen that the application of this strategy causes an increase in engine performance. The best performance results are obtained with a 20% EGR capacity. With a 20% EGR capacity, the biggest increase in power, torque and BMEP which is around 3.7% occurs at 50% load. The biggest increase in thermal efficiency is around 16.2% which occurs at 75% load, while the biggest decrease in SFOC is around 15.3% which occurs at 75% load. In terms of emissions, this strategy causes a decrease in NO and HC emissions, while CO emissions increase. The best emission results are obtained with a 15% EGR capacity. NO emissions decrease in all load ranges. The biggest decrease is around 93% at high loads with 15% EGR capacity. HC emissions decrease in low to medium loads. The biggest decrease is around 22.3% in low loads with 15% EGR capacity, while the average CO emissions increase in all load ranges.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	emissions, exhaust gas recilculation (EGR), dual fuel diesel engine, performance, split injection
Subjects:	T Technology > TJ Mechanical engineering and machinery V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM731 Marine Engines
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36101-(S2) Master Theses
Depositing User:	Rahmatullah Dimas Tegar
Date Deposited:	23 Jul 2026 06:32
Last Modified:	23 Jul 2026 06:32
URI:	http://repository.its.ac.id/id/eprint/69720

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