Metrological and methodological support for bench studies of diesel engines

Abstract

The presence of exhaust gas emissions into the environment during the operation of diesel engines is an urgent environmental problem both for the state of the atmospheric air and for agricultural crops, since the toxic substances contained in the exhaust gas are absorbed by plants and accumulated in crop production. Thus, the environmental characteristics of diesel engines are now becoming the most important indicators in their operation. The problem of improving the performance of diesel engines is solving at the present stage in the process of their production by improving and carefully working out the design schemes and technological processes associated with the manufacture of their most important parts, and in the process of operation – by improving the methods and tools used for maintenance and repair. This approach can be considered justified due to the influence of a significant number of factors (design and operational) on the performance of diesel engines. As is known, the quality characteristics of the mixture formation and the nature of the fuel combustion process depend on the fuel supply parameters. Analysing the state of the problem of improving the performance of diesel engines, we can draw the following conclusion: the main reason for the deviation of the working cycle of engines from the set values is the deviation of the fuel supply parameters from the optimal values.

Investigation of coking diesel injector spray nozzles in operation

“…Reducing coking of sprayers at the final phase of injection is possible due to [4][5][6][7]: increasing the stroke of the needle and the diameter of its shut-off cone; reducing the density in the precision sprayer couple; reducing the area of the spray ports; reducing the stroke of the needle and its shut-off cone diameter. As a criterion for coking of the spray ports, the duration of the needle fit is often taken [8][9][10][11][12][13][14][15].…”