RESEARCH OF FUEL/AIR MIXING CONDITIONS INFLUENCE IN UPRATING OF OPPOSED-PISTON TWO-STROKE DIESEL ENGINE

Rok vydání: 2020
Předmět:
Zdroj: Internal Combustion Engines. :21-27
ISSN: 2411-0531
0419-8719
DOI: 10.20998/0419-8719.2020.1.03
Popis: The article analyzes fuel/air mixture formation and ways to increase the fuel combustion efficiency in a highly-forced 2-stroke boxer diesel engines.An increase in liter capacity requires appropriate increase in cyclic fuel supply, which must be efficiently burned in the limited space of the combustion chamber. As it is known, it is at full and timely combustion of fuel that economy and efficient operation of a heating machine are achieved and the formation of a fuel-air mixture is an important condition for ensuring a quality combustion process. To study the influence of individual design parameters on the working process, we used mathematical modeling of the working process using the DIESEL-RK software package, which belongs to the class of thermodynamic programs, as well as the program of visualization of the process of fuel jets movement. The assessment of factors influencing the two-stroke diesel engine indicators was carried out on the basis of fuel distribution by zones (illustrations are given) and on the basis of the results of injection and heat generation calculation. Such factors as a change (increase) in the cyclic feed at a fixed value of the coefficient α, the change in the vortex ratio (the fuel injection direction depends on the intensity and rotation direction of the air vortex), fuel supply start angle, change in the fuel supply duration, change in the fuel distribution in the combustion chamber volume (by changing the spatial orientation of the nozzle openings of the atomizer and their diameter) have been reviewed.The nature of the change in the fuel distribution, the fuel jet deformation in the combustion chamber of a diesel engine and the possibility of reducing the contact the core of jet with the combustion chamber and increasing the fuel evaporation zone volume with a reduction in fuel delivery time are established in research result. The results obtained are a prerequisite for the development of technical solutions to ensure a new level of forcing and increase the fuel efficiency of a two-stroke diesel engine and development of recommendations for improving combustion efficiency.
Databáze: OpenAIRE
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