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Application of Scavenging-Port Injection to a Two-Stroke Boat Engine Fueled with CNG
Technical Paper
2005-32-0083
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English
Abstract
This paper presents the effect of application of scavenging-port injection to a two-stroke two-cylinder boat engine fueled with a compressed natural gas (CNG). Experiments were carried out at a constant speed of 3000 rpm and WOT condition with varying excess air ratio in lean region. A CNG injector for a production automobile engine was utilized and installed into the scavenging ports. Comparison was made with homogeneous charge operation using a gas mixer. By applying the scavenging-port injection, unburned-fuel in the exhaust gas was reduced close to half which must be due to the reduction of fuel short-cutting during the gas exchange process. The lean-burn limit was extended from the excess air ratio of 1.21 to 1.57. The maximum decrease of BSFC reached to 25 %. This suggests that stratified-combustion could be realized in its lean-burn region.
Authors
Citation
MAEHARA, M., KISHIMOTO, H., ARAI, S., FUKUSHIMA, T. et al., "Application of Scavenging-Port Injection to a Two-Stroke Boat Engine Fueled with CNG," SAE Technical Paper 2005-32-0083, 2005.Also In
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