Stratified-charge two-stroke stepped-piston engine

A two-stroke stepped-piston prototype engine, in carbureted version was designed and developed. It incorporates a unique three-port transfer system with an accumulator for high induction efficiency, so as to perform very much like a two-stroke engine but equipped with a four-stroke crankcase lubrica...

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Main Author:	Abdul Latiff, Zulkarnain
Format:	Thesis
Language:	English
Published:	2011
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/28530/5/ZulkarnainAbdulLatifPFKM2011.pdf
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id	my-utm-ep.28530
record_format	uketd_dc
spelling	my-utm-ep.285302018-05-27T06:38:50Z Stratified-charge two-stroke stepped-piston engine 2011-12 Abdul Latiff, Zulkarnain TJ Mechanical engineering and machinery A two-stroke stepped-piston prototype engine, in carbureted version was designed and developed. It incorporates a unique three-port transfer system with an accumulator for high induction efficiency, so as to perform very much like a two-stroke engine but equipped with a four-stroke crankcase lubrication system. GT-Power software was used in the development stage to predict the engine output. The data predicted was then compared with the experimental results. A computational fluid dynamic software, COSMOS/Floworks, was used to develop a computational model to investigate the scavenging and compression processes of the prototype engine.The prototype was subjected to a series of laboratory trials for engine performance and emissions tests. Emission characteristics were established for regulated and unregulated gases. From the engine performance test, maximum pressures attained from GT-Power simulation and prototype engine were 54.62 bars at 5000 rpm and 26.12 bars at 4500 rpm respectively. Maximum indicated power produced is 11.25 kW at 8000 rpm and 3.86 kW at 4500 rpm for GT-Power simulation and prototype engine respectively. Torque, brake power and brake fuel consumption were also determined. For comparative reason, a Yamaha 125Z engine was selected as the cylinder capacity with similar working principle as the prototype engine. Torque produced by Yamaha 125Z was highest, followed by GT-Power simulation and prototype engine. The average difference of torque between Yamaha 125Z and GT-Power simulation was about 13.06%. The minimum values of brake specific fuel consumption for Yamaha 125Z, GT-Power simulation and prototype engine were 280.42 g/kWh at 3500 rpm, 351.08 g/kWh at 5000 rpm and 510 g/kWh at 3500 rpm respectively. The maximum peaks differences were attributed to the differences of combustion chamber design used and assumptions made in GT-Power. 2011-12 Thesis http://eprints.utm.my/id/eprint/28530/ http://eprints.utm.my/id/eprint/28530/5/ZulkarnainAbdulLatifPFKM2011.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:69298?site_name=Restricted Repository phd doctoral Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Abdul Latiff, Zulkarnain Stratified-charge two-stroke stepped-piston engine
description	A two-stroke stepped-piston prototype engine, in carbureted version was designed and developed. It incorporates a unique three-port transfer system with an accumulator for high induction efficiency, so as to perform very much like a two-stroke engine but equipped with a four-stroke crankcase lubrication system. GT-Power software was used in the development stage to predict the engine output. The data predicted was then compared with the experimental results. A computational fluid dynamic software, COSMOS/Floworks, was used to develop a computational model to investigate the scavenging and compression processes of the prototype engine.The prototype was subjected to a series of laboratory trials for engine performance and emissions tests. Emission characteristics were established for regulated and unregulated gases. From the engine performance test, maximum pressures attained from GT-Power simulation and prototype engine were 54.62 bars at 5000 rpm and 26.12 bars at 4500 rpm respectively. Maximum indicated power produced is 11.25 kW at 8000 rpm and 3.86 kW at 4500 rpm for GT-Power simulation and prototype engine respectively. Torque, brake power and brake fuel consumption were also determined. For comparative reason, a Yamaha 125Z engine was selected as the cylinder capacity with similar working principle as the prototype engine. Torque produced by Yamaha 125Z was highest, followed by GT-Power simulation and prototype engine. The average difference of torque between Yamaha 125Z and GT-Power simulation was about 13.06%. The minimum values of brake specific fuel consumption for Yamaha 125Z, GT-Power simulation and prototype engine were 280.42 g/kWh at 3500 rpm, 351.08 g/kWh at 5000 rpm and 510 g/kWh at 3500 rpm respectively. The maximum peaks differences were attributed to the differences of combustion chamber design used and assumptions made in GT-Power.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Abdul Latiff, Zulkarnain
author_facet	Abdul Latiff, Zulkarnain
author_sort	Abdul Latiff, Zulkarnain
title	Stratified-charge two-stroke stepped-piston engine
title_short	Stratified-charge two-stroke stepped-piston engine
title_full	Stratified-charge two-stroke stepped-piston engine
title_fullStr	Stratified-charge two-stroke stepped-piston engine
title_full_unstemmed	Stratified-charge two-stroke stepped-piston engine
title_sort	stratified-charge two-stroke stepped-piston engine
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2011
url	http://eprints.utm.my/id/eprint/28530/5/ZulkarnainAbdulLatifPFKM2011.pdf
_version_	1747815675332657152

Stratified-charge two-stroke stepped-piston engine

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