Kajian CFD Pengaruh Variasi Timing Ignitation Terhadap Performa Dan Emisi Motor Bensin Dengan Ansys Forte

Al Hasani, Ahmad Musfiq (2026) Kajian CFD Pengaruh Variasi Timing Ignitation Terhadap Performa Dan Emisi Motor Bensin Dengan Ansys Forte. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Peningkatan performa dan penurunan emisi gas buang merupakan aspek penting dalam pengembangan mesin bensin empat langkah. Salah satu parameter yang berpengaruh terhadap karakteristik pembakaran adalah ignition timing, karena menentukan waktu penyalaan campuran udara dan bahan bakar di dalam ruang bakar. Penelitian ini bertujuan menganalisis pengaruh variasi ignition timing terhadap performa mesin, efisiensi termal, emisi gas buang, serta karakteristik aliran di dalam ruang bakar menggunakan metode Computational Fluid Dynamics (CFD). Simulasi dilakukan menggunakan perangkat lunak ANSYS Forte pada mesin bensin empat langkah satu silinder berbahan bakar gasoline dengan variasi ignition timing 11°, 13°, 15°, 17°, dan 19° BTDC pada putaran mesin 3000, 4000, dan 5000 RPM. Parameter yang dianalisis meliputi torsi, Indicated Power (IP), Indicated Mean Effective Pressure (IMEP), Indicated Specific Fuel Consumption (ISFC), efisiensi termal, emisi CO dan UHC, serta distribusi kecepatan dan temperatur di dalam silinder. Hasil penelitian menunjukkan bahwa pemajuan ignition timing meningkatkan performa mesin pada seluruh variasi putaran. Nilai Indicated Power tertinggi sebesar 17,58 kW diperoleh pada 5000 RPM dengan ignition timing 19° BTDC, sedangkan kondisi operasi paling efisien diperoleh pada 3000 RPM dengan ignition timing 19° BTDC yang menghasilkan torsi 39,44 N·m, IMEP 0,993 MPa, ISFC terendah 188,96 g/kW-h, dan efisiensi termal tertinggi 43%. Selain itu, pemajuan ignition timing menghasilkan penurunan emisi CO dan UHC serta memperbaiki distribusi temperatur dan kecepatan pembakaran di dalam ruang bakar. Dengan demikian, variasi ignition timing terbukti memberikan pengaruh signifikan terhadap peningkatan performa, efisiensi pembakaran, dan karakteristik emisi mesin bensin.
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Improving engine performance while reducing exhaust emissions is a major challenge in the development of four-stroke gasoline engines. One of the most influential combustion parameters is ignition timing, as it determines the initiation of the air-fuel mixture combustion process inside the combustion chamber. This study aims to investigate the effect of ignition timing variations on engine performance, thermal efficiency, exhaust emissions, and in-cylinder flow characteristics using the Computational Fluid Dynamics (CFD) approach. Numerical simulations were carried out using ANSYS Forte on a single-cylinder four-stroke gasoline engine with ignition timing variations of 11°, 13°, 15°, 17°, and 19° BTDC at engine speeds of 3000, 4000, and 5000 RPM. The evaluated parameters included torque, Indicated Power (IP), Indicated Mean Effective Pressure (IMEP), Indicated Specific Fuel Consumption (ISFC), thermal efficiency, CO and UHC emissions, as well as in-cylinder velocity and temperature distributions. The simulation results indicate that advancing the ignition timing improves engine performance at all engine speeds. The highest Indicated Power of 17.58 kW was achieved at 5000 RPM with an ignition timing of 19° BTDC. Meanwhile, the optimum operating condition in terms of overall efficiency was obtained at 3000 RPM with an ignition timing of 19° BTDC, producing a torque of 39.44 N·m, an IMEP of 0.993 MPa, the lowest ISFC of 188.96 g/kW-h, and the highest thermal efficiency of 43%. Furthermore, advancing the ignition timing reduced CO and UHC emissions while improving the in-cylinder temperature and flow distributions during combustion. These findings demonstrate that ignition timing variation has a significant effect on engine performance, combustion efficiency, and exhaust emission characteristics in a gasoline engine.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Computational Fluid Dynamics (CFD); Ignition Timing; Performa Mesin; Emisi Gas Buang ======================================================== Computational Fluid Dynamics (CFD); Ignition Timing; Engine Performance; Exhaust Emission.
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ785 Internal combustion engines. Spark ignition
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Ahmad Musfiq Al Hasani
Date Deposited:	31 Jul 2026 06:42
Last Modified:	31 Jul 2026 06:42
URI:	http://repository.its.ac.id/id/eprint/140538

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