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Comparative Investigation on Fuel Feed Methods in Two-Stroke Cycle Methanol Engine
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Abstract
A direct fuel-injection two-stroke cycle engine operated with neat methanol was investigated. The engine performance, combustion and exhaust-gas characteristics were analyzed experimentally and compared for operation with a carburetor, EFI injection at the intake manifold, and EFI injection at the scavenging port.
The power and the brake thermal efficiency of the direct fuel-injection engine were higher than those of engines operated with a carburetor and either of the two EFI methods.
The exhausted unburnt fuel of the direct fuel-injection engine was lower than that for operation with a carburetor, and formaldehyde and the CO concentration were of the same level as for operation with the carburetor and EFI methods. The NOx concentration of the direct fuel-injection was half the level of the result of carburetor operation. Because a stratified charge using direct fuel-injection activated the combustion of the lean mixture which increases working gas temperature, therefore, the vaporization of injected fuel was promoted by the elevated temperature of the residual gas.
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Citation
Kubota, Y., Hayashi, S., Enoki, K., Kajitani, S. et al., "Comparative Investigation on Fuel Feed Methods in Two-Stroke Cycle Methanol Engine," SAE Technical Paper 922312, 1992, https://doi.org/10.4271/922312.Also In
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