Ethanol-powered engine noise emissions. Experimental study of combustion pulse characteristics

摘要

Alcohol fuels are recognised as superior to petroleum fuels from the viewpoint of environmental safety and pollution. Alcohols are one of the most promising substitutes for the conventional petroleum fuels. The main problem, besides economy, with its applications being its low reactivity. The low reactivity leads to increased ignition difficulties and it also affects flame spreading and combustion. To improve the ignition properties ignition improvers can be used. The aim of this research report was to investigate the noise radiation from a modified 11 litre diesel engine running in ethanol conditions. In order to identify the noise sources on the combustion engine measurements were carried out of Combustion pulse characteristics, Sound intensity radiation, Sound pressure levels and Running modes (RMA). The vibrations of the engine mounts have also been studied through Transfer functions analyses of the engine mounts. 13 refs, 23 figs, 1 tab, appendices with 22 figs