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ITS » Non Degree » Teknik Mesin - D3
Posted by fandikaaqsa@its.ac.id at 04/05/2016 09:33:24  •  1016 Views


KAJIAN NUMERIK PENGARUH VARIASI IGNITION TIMING DAN AFR TERHADAP PERFORMA UNJUK KERJA PADA ENGINE MOTOR TEMPEL EMPAT LANGKAH SATU SILINDER YAMAHA F2.5 72 CC MENGGUNAKAN BAHAN BAKAR BENSIN DAN LPG

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.



KeywordsOil fuel; Gasoline; LPG; Spark ignition engine; Ignition timing; Air-fuel ratio
 
Subject:  Permesinan; Konversi energi
Contributor
  1. Hendro Nurhadi, Dipl-Ing., Ph.D
Date Create: 04/05/2016
Type: Text
Format: PDF
Language: Indonesian
Identifier: ITS-NonDegree-21002160001397
Collection ID: 21002160001397
Call Number: RSM 629.253 Ard k


Source
Non Degree of Machine Engineering, RSM 629.253 Ard k, 2014

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Copyright @2016 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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  1.  ITS-NonDegree-41416-2111030051-abstract_id.pdf - 1067 KB
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  3.  ITS-NonDegree-41416-2111030051-conclusion.pdf - 246 KB




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