Samudera, Aditya Kris (2026) Eksperimen Pengaruh Variasi Diameter Nozzle Injektor dan Tekanan Injeksi terhadap Efisiensi Konsumsi Bahan Bakar Mesin Diesel. (Experiment On the Effect of Variations in Injector Nozzle Diameter and Injection Pressure on Diesel Engine Fuel Consumption Efficiency). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.
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Abstract
Diesel engines are widely used in the transportation and industrial sectors due to their high thermal efficiency and excellent operational durability. However, the issue of increasing fuel consumption remains a frequent challenge, particularly concerning the inefficiency of the fuel system. One of the main factors influencing combustion efficiency and fuel consumption is the injector characteristics, specifically the nozzle diameter and injection pressure. An improper combination of these two parameters can lead to suboptimal fuel atomization, uneven air-fuel mixing, and an increase in total fuel consumption volume. This study aims to analyze and determine the effects of variations in nozzle diameter and injection pressure on the fuel consumption efficiency of diesel engines. The research was conducted experimentally, utilizing nozzle diameter variations of 0.150, 0.152, and 0.154 mm, and injection pressure variations of 400, 420, and 440 bar. Testing was carried out at engine speeds of 500, 1000, and 1500 rpm, with fuel consumption measured over a 1-minute duration for each parameter variation. Fuel consumption was measured using the volumetric method, and subsequently analyzed in terms of fuel volumetric flow rate, fuel mass flow rate, Brake Power (BP), and Brake Specific Fuel Consumption (BSFC). Based on the research results, the combination of a 0.150 mm nozzle diameter and a 400 bar injection pressure produced the lowest BSFC value, thereby yielding the highest efficiency. However, the combination of a 0.152 mm nozzle diameter and a 420 bar pressure represents the closest to optimal condition, as it provides a balance between atomization quality and the volume of fuel discharged, resulting in a fairly efficient and stable combustion. Therefore, it can be concluded that diesel engine efficiency is not only determined by the lowest fuel consumption value, but also by the balance of size parameters and injection system pressures used.
| Item Type: | Thesis (Undergraduate) |
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| Uncontrolled Keywords: | diesel engine, injector nozzle diameter, injection pressure, fuel consumption, common rail injection system. |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Fakultas Teknik > Program Studi Teknik Mesin |
| Depositing User: | 1422200157 Aditya Kris Samudera |
| Date Deposited: | 24 Aug 2026 05:01 |
| Last Modified: | 24 Aug 2026 05:01 |
| URI: | http://repository.untag-sby.ac.id/id/eprint/46523 |
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