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ITS » Non Degree » Teknik Mesin - D3 Posted by fandikaaqsa@its.ac.id at 04/05/2016 09:33:24 • 1718 Views
STUDY OF PERFORMANCES OUTBOARD ENGINE YAMAHA F2.5 72 CC FUELLED BY GASOLINE AND LPG VARATION ON IGNITION TIMING AND AFR USING NUMERICAL METHOD
Author : ARDILIANSYAH, HELMI RIZKI ( 2111030051 )
ABSTRAK
Konsumsi bahan bakar minyak terutama bensin yang
terus meningkat tidak diimbangi oleh ketersediaan dari bahan
bakar minyak tersebut. Hal ini mengakibatkan terjadinya krisis
bahan bakar minyak. Liquefied Petroleum Gas LPG akhir-akhir
ini banyak diperhatikan sebagai bahan bakar alternatif pengganti
bahan bakar minyak. Banyak penelitian yang telah dilakukan
mengenai penggunaan LPG pada mesin Spark Ignition Engine
SIE yang sebagian besar diantaranya menggunakan metode
eksperimental dan masih sedikit yang menggunakan metode
simulasi numerik.
Kajian secara numerik ini memanfaatkan perangkat
lunak Lotus Engine Simulation LES sebagai alat bantu utama.
Langkah awal adalah dengan memasukkan dimensi komponen
engine dari spesifikasi pabrikan. Kemudian dilakukan analisis
pembakaran dan unjuk kerja dengan LES yang berdasarkan
variasi ignition timing dan rasio udara-bahan bakar Air Fuel
Ratio AFR.
Hasil yang didapatkan yaitu terjadi perbaikan performa
brake torque brake power BMEP dan BSFC pada engine
berbahan bakar LPG dengan pengaturan AFR 155 dan ignition
timing 25 BTDC dibandingkan engine berbahan bakar gasoline
pada kondisi operasional standar dengan nilai kenaikan masing - masing sebesar 486 506 484 dan penurunan
sebesar -199 . Tekanan in cylinder dam temperatur combustion
gas pada LPG dengan pengaturan AFR 155 dan ignition timing
25 BTDC mesing-masing terjadi peningkatan sebesar 1138
dan penurunan sebesar -7 .
ABSTRACT
Consumption of oil fuels especially gasoline continues to increase is not offset by the availability of the fuel. This resulted in the crisis of oil fuel. Liquefied Petroleum Gas LPG had became a big attention as an alternative fuel for 4 stroke spark ignition engine S.I.E.. There were many researchers around the world conducted the researches about characteristics of LPG on S.I.E compared with gasoline. Most of them using experimental method and just few of them using numerical method in their studies. This numerical study uses Lotus Engine Simulation LES software. The first step was dimensional measurement of some engine components for numerical modelling input. The next step was combustion performances and heat transfer analysis using LES based on dimensional measurement at the previous step with variation on ignition timing and air-fuel ratio AFR.
Several conclusions could be obtained. LPG gives performances improvement in the term of brake torque brake power BMEP and BSFC with AFR setting of 155 and ignition timing setting of 25 BTDC relatively to gasoline at standard operational condition with the value about in percentage 486 506 484 and decreased -199 respectively. Inner cylinder pressure and combustion gas temperature at LPG with AFR setting 155 and ignition timing setting 25 BTDC increased 1138 and decreased -7 respectively.
Source Non Degree of Machine Engineering, RSM 629.253 Ard k, 2014
Coverage ITS Community
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