Evaluation of the effect of fuel unevenness on diesel performance

In the vast majority of agricultural machinery, diesel is used as the engine. The amount of fuel supplied to the engine cylinders is the main factor determining its power, economic and environmental characteristics. It can be considered as a value composed of two parts: a controllable fuel supply system and uncontrolled, depending on the quality of the system. The deterioration in the performance of the engine is greater, the higher the proportion of uncontrolled part of the fuel supplied. The deviation of the amount of fuel supplied from a given fuel can occur in the following cases: uneven fuel delivery along the engine cylinders; instability of the fuel supply to the cylinder. If the uneven fuel flow through the cylinders is regulated by the requirements of GOST 10578-95 and is allowed depending on the operating mode from 6 to 35 %, then the instability of fuel supply from cycle to cycle is not regulated by standards and can be as high as 10-40 % according to other researchers. The combined influence of these parameters on the fuel supply process leads to a significant deviation in the cyclic fuel supply. The theoretical analysis of the main parameters of the engine showed that an increase in unevenness leads to a change in them, which worsens the indicator. This deterioration is the greater, the greater the degree of curvature of the line of change in the engine index from the change in fuel consumption. Based on the above results, the following conclusions are drawn: an increase in the unevenness and instability of fuel supply leads to a deterioration in the main engine performance; the degree of deterioration in the performance of the engine is greater the greater the unevenness and instability and the higher the nonlinearity of the curve of the change in the index from the fuel consumption; at present, the instability of fuel supply is not regulated, which does not allow controlling the quality of the process.

quality of diesel operation, diesel performance, diesel fuel equipment, instability of cyclic feed, method for determining the cyclic feed rate