Arohman, Abdul Wahid (2019) Pengaruh Penambahan Udara Menggunakan Electric Supercharger Pada Mesin Diesel Berbahan Bakar Emulsi Air Dalam Diesel Terhadap Performa Mesin, Karakteristik Pembakaran, Dan Emisi. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Emulsi merupakan bahan bakar yang menjadi salah satu solusi untuk menurunkan emisi yang dihasilkan dari proses pembakaran mesin diesel. Pada proses pembakaran emulsi, terjadi proses ledakan-mikro. Proses ledakan-mikro ini memecah butiran droplet diesel menjadi droplet yang lebih kecil, sehingga terjadi proses pencampuran bahan bakar dan udara menghasilkan pembakaran yang lebih sempurna. Beberapa penelitian bahan bakar emulsi telah dilakukan dan terbukti mampu menurunkan nilai emisi. Namun, penggunaan bahan bakar emulsi mengakibatkan konsumsi bahan bakar menjadi boros serta nilai emisi HC dan CO meningkat. Pada penelitian ini bertujuan untuk menemukan pengaruh variasi penambahan laju massa aliran udara udara terhadap performa mesin, emisi gas buang, dan karakteristik pembakaran seperti laju pelepasan panas, tekanan silinder, penundaan pengapian, dan durasi pembakaran. Penelitian dilakukan secara eksperimen dengan menggunakan mesin Diamond DI 800 pada kecepatan konstan 1500 rpm. Bahan bakar yang akan digunakan pada penelitian ini yaitu emulsi 30% dan 35%. Metode penelitian yang dilakukan adalah penambahan laju massa aliran udara udara ke dalam ruang bakar dengan mengatur voltase pada electric supercharger 0.013 kg/s, 0.018 kg/s, 0.023 kg/s, dan 0.028 kg/s. Pengukuran proses pembakaran menggunakan pressure transducer untuk mendapatkan nilai tekanan silinder dan laju pelepasan panas. Pengukuran emisi menggunakan gas analyzer untuk mendapatkan nilai emisi CO, HC, dan Soot. Hasil penelitian menunjukkan bahwa penggunaan bahan bakar emulsi nilai tekanan silinder meningkat seiring dengan peningkatan kadar air. Pada emulsi 30 kondisi optimal variasi laju massa aliran udara udara berada pada variasi 0,018 kg/s dengan puncak tekanan sebesar 59,86 dan pada emulsi 35 kondisi optimal variasi laju massa aliran udara udara berada pada kondisi tanpa variasi laju massa aliran udara udara (0,013 kg/s) dengan tekanan silinder sebesar 61,6 bar. Pada emulsi 30 kondisi optimum variasi laju massa aliran udara udara berada pada 0,028 kg/s dengan penurunan SFC sebesar 18% dan pada emulsi 35 mengalami penurunan sebesar 12% jika dibandingkan kondisi standart (0,013 kg/s). Efisiensi termal pada emulsi 30 kondisi optimum berada pada variasi 0,028 kg/s dengan peningkatan sebesar 14% dan emulsi 35 kondisi optimum berada pada variasi 0,018 kg/s dengan peningkatan sebesar 15% bila dibandingkan dengan kondisi standar (0,013kg/s). Emisi HC dan CO pada emulsi 30 kondisi optimum terjadi pada variasi 0,028 kg/s dengan nilai penurunan sebesar 32% dan 45%. Pada emulsi 35 kondisi optimum terjadi pada variasi 0,018 kg/s dengan nilai penurunan emisi HC dan CO sebesar 48% dan 37%.
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An emulsion is a fuel that is one of the solutions to reduce emissions produced from the combustion process of diesel engines. In the emulsion combustion process, a micro-explosion process occurs. This micro-explosion process breaks down droplet diesel granules into smaller droplets so that the fuel and air mixing process results in more complete combustion. Several emulsion fuel studies have been carried out and have been shown to reduce emission values. however, the use of emulsion fuel has resulted in wasteful consumption of fuel and increased HC and CO emissions. This study aims to find the effect of variations in the additional mass flow rate of air on engine performance, exhaust emissions, and combustion characteristics such as heat release rate, cylinder pressure, ignition delay, and combustion duration. The study was carried out experimentally using a Diamond DI 800 machine at a constant speed of 1500 rpm. The fuel that will be used in this study is emulsion 30% and 35%. The research method is the additional mass flow rate of air into the combustion chamber by adjusting the voltage on the electric supercharger 0.013 kg/s, 0.018 kg/s, 0.023 kg/s, and 0.028 kg/s. The measurement of the combustion process uses a pressure transducer to get the value of cylinder pressure and the heat release rate. Emission measurement uses a gas analyzer to get CO, HC, and Soot emission values. The results showed that the use of emulsion fuel the value of cylinder pressure increased with increasing water content. In the emulsion 30, the optimal condition mass flow rate of air variation is at 0.018 kg / s cylinder pressure with a peak pressure of 59.86 bar and in the emulsion 35 optimal conditions, mass flow rate of air variations are in conditions without variations in mass flow rate of air with cylinder pressure of 61.6 bar. In the emulsion 30, the optimum conditions for variations in the mass flow rate of air are at 0.028 kg/s with a decrease in SFC of 18% and in the emulsion 35, it decreases by 12% compared to standard conditions (0.013 kg/s). The thermal efficiency of the 30 emulsion optimum conditions is in the variation of 0.028 kg/s with an increase of 14% and the optimum emulsion 35 is in the variation of 0.018 kg/s with an increase of 15% compared to standard conditions (0.013 kg/s). The HC and CO emissions in the 30 emulsion optimum conditions occur in the variation of 0.028 kg/s with a decrease value of 32% and 45%. In the emulsion of 35 optimum conditions occurred in the variation of 0.018 kg/s with the value of HC and CO emissions decreasing by 48% and 37%.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | water-in-diesel-emulsion, mass flow rate, emissions, performance diesel engine, characteristics combustion. |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ254.7 Combustion chambers T Technology > TJ Mechanical engineering and machinery > TJ324.5 Fuel systems |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21101-(S2) Master Thesis |
| Depositing User: | Abdul Wahid Arohman |
| Date Deposited: | 21 Jul 2026 08:23 |
| Last Modified: | 21 Jul 2026 08:23 |
| URI: | http://repository.its.ac.id/id/eprint/67808 |
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