Numerical Analysis of the Effect of Cyclone Adding in Intake System on Air Flow Characteristics of Diesel Engine

Pambayun, Abyan (2026) Numerical Analysis of the Effect of Cyclone Adding in Intake System on Air Flow Characteristics of Diesel Engine. Other thesis, INSTITUT TEKNOLOGI SEPULUH NOPEMBER.

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Abstract

Penelitian ini melakukan investigasi numerik terhadap efek aerodinamis pemasangan cyclone intake pada karakteristik aliran udara mesin diesel naturally aspirated TF85 menggunakan Computational Fluid Dynamics (CFD) berbasis ANSYS Fluent. Simulasi steady-state tiga dimensi dilakukan pada konfigurasi baseline (tanpa cyclone) dan empat model cyclone dengan variasi radius, panjang vane, dan sudut twist vane (GD 05 03 30, GD 11 05 30, GD 11 04 30, dan GD 11 03 60), menggunakan model turbulensi k–ω SST. Hasil simulasi menunjukkan bahwa pemasangan cyclone secara konsisten meningkatkan kecepatan tangensial rata-rata dan swirl ratio dibandingkan baseline, dengan swirl ratio meningkat dari 0,098 pada baseline menjadi 0,220 pada model GD 11 03 60 yang menghasilkan intensitas swirl tertinggi. Namun, peningkatan swirl tidak selalu berbanding lurus dengan penurunan tekanan: model GD 05 03 30 menghasilkan pressure drop tertinggi 7.590 Pa dengan peningkatan swirl yang relatif kecil, sedangkan model GD 11 04 30 memberikan keseimbangan terbaik dengan peningkatan swirl ratio sekitar 69% namun pressure drop terendah 6.927 Pa di antara seluruh konfigurasi. Sementara itu, model GD 11 03 60 mampu meningkatkan kecepatan tangensial hingga sekitar 125% dengan pressure drop yang hampir setara dengan baseline 7.181 Pa. Temuan ini menunjukkan bahwa performa aerodinamis cyclone intake sangat ditentukan oleh geometri vane, dan optimasi geometri memungkinkan peningkatan swirl tanpa penalti tekanan yang signifikan, sehingga memberikan dasar ilmiah bagi pengembangan desain intake berbasis cyclone pada mesin diesel marine berukuran kecil.
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This study presents a numerical investigation into the aerodynamic effects of cyclone intake installation on the air flow characteristics of a naturally aspirated TF85 diesel engine using Computational Fluid Dynamics (CFD) in ANSYS Fluent. Three-dimensional steady-state simulations were performed on a baseline configuration (without cyclone) and four cyclone models with varying radius, vane length, and vane twist angle (GD 05 03 30, GD 11 05 30, GD 11 04 30, and GD 11 03 60), employing the k–ω SST turbulence model. The results show that cyclone installation consistently increases average tangential velocity and swirl ratio compared to the baseline, with swirl ratio rising from 0.098 in the baseline to 0.220 in the GD 11 03 60 model, which produced the strongest swirl among all configurations. However, swirl enhancement was not always proportional to pressure loss: the GD 05 03 30 model produced the highest pressure drop 7,590 Pa with only a modest swirl improvement, while the GD 11 04 30 model offered the best balance, increasing swirl ratio by approximately 69% while yielding the lowest pressure drop 6,927 Pa of all configurations. Meanwhile, the GD 11 03 60 model increased tangential velocity by approximately 125% while maintaining a pressure drop nearly identical to the baseline 7,181 Pa. These findings indicate that the aerodynamic performance of a cyclone intake is strongly governed by vane geometry, and that geometric optimization can enhance swirl without a significant pressure penalty, providing a scientific basis for cyclone based intake design development in small marine diesel engines.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	ANSYS Fluent, Computational Fluid Dynamics (CFD), Cyclone Intake, Swirl Ratio, Pressure Drop ANSYS Fluent, Computational Fluid Dynamics (CFD), Cyclone Intake, Swirl Ratio, Pressure Drop
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics T Technology > TJ Mechanical engineering and machinery > TJ785 Internal combustion engines. Spark ignition T Technology > TJ Mechanical engineering and machinery > TJ797 Diesel motor--Fuel systems--Testing. T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics. Tubes--Fluid dynamics
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Abyan Pambayun
Date Deposited:	04 Aug 2026 08:00
Last Modified:	04 Aug 2026 08:00
URI:	http://repository.its.ac.id/id/eprint/142333

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