Performance Characterization of a Direct Injection LPG Fuelled Two-Stroke Motorcycle Engine

Teoh, Yew Heng; Gitano-Briggs, Horizon; Mustafa, K. F.

doi:10.4271/2008-32-0045

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…Liquefied petroleum gas (LPG), as an alternative fuel with the merits of quick evaporation, high octane number, wide flammable range and less harmful combustion products, is considered to be one of the most potential clean fuels. Using direct injection (DI) for LPG engine can improve its power performance, fuel economy and emission characteristics [1,2,3,4]. With stratified lean combustion, it can save more fuel for DI LPG engine [5].…”

Section: Introductionmentioning

confidence: 99%

3D Numerical Simulation of Stratified Mixture Formation of DI LPG Engine

Zhou

Hao

et al. 2013

AMM

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Low-carbon economy is a necessary requirement for sustainable development. LPG Direct Injection (DI) method can greatly improve the engines power performance, fuel economy and emission characteristics, hence a new wall-guided combustion system with a specially designed piston cavity used to form lean stratified mixture for DI LPG engine was proposed. In this paper, the stratified mixture formation process of a DI LPG engine was simulated. Before this, the model and method used in the simulation was firstly validated by simulating mixture formation process in an optical engine with conventional piston. The simulation results of the stratified mixture formation showed that, the mixture could gradually move upward along the combustion chamber wall under the guide of the spray induced entrainment vortex and the wall. At the same time, the rich mixture would diffuse to its surroundings. Finally, by the time to ignition, the ignitable stratified lean mixture could be formed.

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Section: Introductionmentioning

confidence: 99%

3D Numerical Simulation of Stratified Mixture Formation of DI LPG Engine

Zhou

Hao

et al. 2013

AMM

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“…In addition, air compressor and separate liquid fuel injector can also be eliminated with a gaseous fuel system. Elimination of the major components like air compressor, fuel pump as well as a separate liquid fuel injector will reduce the conversion cost by about 52% [5].…”

Section: Introductionmentioning

confidence: 99%

Direct Fuel Injection of LPG in Small Two-Stroke Engines

Teoh¹,

Gitano-Briggs²

2011

International Journal on Advanced Science, Engineering and Information Technology

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The commonly used carburetted two-stroke engines in developing countries have high exhaust emission and poor fuel efficiency. To meet more rigid emissions requirements, two-stroke vehicles are typically phase out in favour of four-stroke engines. The problems of ubiquitous legacy two-stroke vehicles remain unsolved by these measures and they are likely to be a major source of transport for many years to come. A number of technologies are available for solving the problems associated with two-stroke engines such as catalytic after-treatment and direct fuel injection (DI). However, these solutions are relatively high cost and have shown only slow market acceptance for applications in developing countries. Research in recent years has demonstrated that direct fuel injection is a well developed and readily deployable solution to existing two-stroke engines. Gaseous fuels such as Liquefied Petroleum Gas (LPG) are considered a promising energy source and in many countries provide fuel cost savings. LPG coupled with DI two-stroke technologies, is expected to be clean and cost effective retrofit solution for two-stroke engines. In this research project, direct injection (DI) of Liquefied Petroleum Gas (LPG) is introduced and tested on a typical two-stroke engine. Results of in cylinder combustion pressure translated to fuel mass fraction burned, engine performance and exhaust emissions are taken and compared for various injection timings from premixed (early injection) to fully direct injection mode (late injection). Results show that DI of LPG effectively reduces exhaust hydrocarbon and can substantially improve the fuel economy of two-stroke engines.

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