Analisa Efek Cyclone Terhadap Kinerja Mesin Diesel

Hidayatullah, Mochammad Arif (2026) Analisa Efek Cyclone Terhadap Kinerja Mesin Diesel. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Mesin diesel injeksi langsung skala kecil tetap krusial untuk pembangkit listrik dan aplikasi kelautan, di mana peningkatan performa beserta efisiensi bahan bakar memiliki nilai praktis tinggi. Penelitian ini mengevaluasi pengaruh modifikasi saluran masuk menggunakan pembangkit pusaran tipe siklon pasif terhadap kinerja mesin diesel kelautan. Melalui pendekatan komprehensif numerik dan eksperimental, studi ini menganalisis dampak siklon terhadap daya, torsi, konsumsi bahan bakar spesifik (BSFC), serta efisiensi termal. Secara numerik, simulasi Ansys Forte dilakukan pada 27 geometri siklon guna menemukan pembentukan energi kinetik turbulen (TKE) paling optimal. Selanjutnya, pengujian eksperimental diaplikasikan pada mesin Yanmar TF-85 di rentang kecepatan 1400 hingga 2200 RPM dengan variasi beban 1 hingga 3 kW. Hasil simulasi menunjukkan bahwa model 110560 menghasilkan lonjakan TKE tertinggi sebesar 11,20%, meskipun terjadi sedikit penurunan aliran massa. Secara eksperimental, kehadiran siklon terbukti secara signifikan meningkatkan daya dan torsi pada rentang putaran 1400 hingga 1800 RPM. Secara spesifik pada 1800 RPM, siklon ini mampu menekan nilai BSFC hingga 20,8% serta mendongkrak efisiensi termal sebesar 26,3%. Peningkatan TKE tersebut sukses menyempurnakan proses homogenisasi campuran udara dan bahan bakar, sekaligus memberikan bukti praktis ekonomis untuk optimasi mesin kelautan.
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Small direct-injection (DI) diesel engines remain indispensable for stationary power generation and small marine applications, where improving their output and fuel economy carries real practical value. This study evaluates the effect of modifying an intake manifold using a passive cyclone-type swirl generator on the performance of a marine diesel engine. The research presents a combined numerical and experimental approach to analyze the impact of the cyclone on engine power, torque, brake specific fuel consumption (BSFC), and thermal efficiency. Numerical simulations using Ansys Forte were initially conducted on 27 cyclone geometries to identify optimal turbulent kinetic energy (TKE) generation. Subsequently, experimental testing was performed on a Yanmar TF-85 single-cylinder diesel engine across varying speeds (1400–2200 RPM) and loads (1–3 kW). The numerical results indicated that the 110560-cyclone model generated the highest TKE (+11.20%) despite a slight reduction in mass flow. Experimental findings revealed that the cyclone significantly enhanced power and torque at low-to-medium speeds (1400–1800 RPM). Notably, at 1800 RPM, the optimal cyclone reduced BSFC by up to 20.8% and increased thermal efficiency by 26.3% compared to the standard intake. The enhanced TKE improved air-fuel homogenization, which successfully compensated for the slight volumetric efficiency drop at high speeds, providing practical evidence for intake-side swirl enhancement as an affordable route to improved marine engine performance.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	mesin diesel kapal, intake manifold, cyclone, kinerja mesin, Brake Specific Fuel Consumption (BSFC), marine diesel engine, engine performance
Subjects:	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:	Mochammad Arif Hidayatullah
Date Deposited:	04 Aug 2026 00:59
Last Modified:	04 Aug 2026 01:00
URI:	http://repository.its.ac.id/id/eprint/143678

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