Analysis of investigations of diesel pilot fuel injection parameters influence on performance of a dual-fuel engine

The life of a modern urban person largely depends on the ecological situation in the city. The ecology of the urban environment is influenced by many factors. A leading position in the emission of pollutants into the environment belongs to the means of transport. The main part of harmful emissions is caused by the toxic substances. In connection with the problem of environmental pollution and depletion of oil fields, there comes a necessity to create and put into operation such engines, which in their parameters will comply with the most modern environmental standards and will be highly efficient. For the purpose of improving environmental safety and fuel efficiency, the use of dual-fuel engines is a promising solution. The working process of a dual-fuel engine differs from the one in a conventional diesel engine. In the dual-fuel engine, most of the fuel in the gaseous state is supplied into the intake manifold and is ignited by a small amount of diesel fuel, called pilot fuel and injected directly into the cylinder. In this article the studies concerning the effect of diesel pilot fuel parameters on the performance of the dualfuel engine performance indicators have been analyzed. Such parameters of the pilot fuel like quantity, injection pressure and injection timing have been investigated. The analysis of the influence of the pilot fuel parameters on the knock process and the analysis of the diesel fuel injector nozzle tip thermal state have been carried out as well. According to the obtained results, the optimal values of the investigated parameters promoting emission decreasing and increasing of fuel efficiency of the dual-fuel engine have been chosen.

gas diesel engine, dual-fuel engine, diesel, exhaust gases, pilot injection, natural gas, environmental safety, micro-pilot injection

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