Biodiesel fuel supply parameters influence on technical-economic and ecological characteristics of a diesel engine

The application of alternative fuels in diesel engines is relevant because of the exhaustibility of mineral fuel resources, and the necessity to reduce exhaust gases (EG) toxicity. The most acute problem of diesel engines, if the growing requirements for reducing the toxicity of exhaust gases are taken into consideration, is the reduction of NO_x and particulate emissions. The problem can be solved by optimizing the engine working process by means of biodiesel fuel usage. It is well known that the simultaneous reduction of smokeness and NO_x concentration is quite difficult. It is also known that the toxicity reduction can be achieved by crushing the cyclic fuel feed into two or more parts by changing the fuel injection pressure and changing the advance angle of the pilot and main fuel portions, as well as after fuel injection. The adjusting characteristics have been determined by the advance change of injection angle of the pilot and main fuel portions, the pilot portion fuel mass, and by the injection pressure on the biodiesel fuel. As a result of the determining of the regulating characteristics the dependence of the power and environmental indicators on the adjustment parameters was discovered. It was found out that the most significant impact on the biodiesel engine running was made by the fuel injection pressure and the advance injection angle of the main fuel portion. These adjusting parameters influenced both the power change of the diesel engine and the toxicity of the exhaust gases. The pilot portion mass and the advance injection angle of the pilot dose affected, to a greater extent, the toxicity of the exhaust gases. As a result of the tests, optimal variable ranges of the adjustment parameters for each loading mode were revealed and recommendations for the fuel equipment tuning were given.

biodiesel fuel, work process, exhaust gas toxicity, fuel feed parameters, control characteristic, pilot and main fuel portions, NO_x emissions and particulate reduction, two-stage injection

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