MATHEMATICAL MODEL FOR ASSESSING THE LUBRICATING CAPACITY OF SHIP DISTILLATE FUELS

Abstract

In the study, a comprehensive analysis was carried out, including the study of the physio-chemical and tribological properties of mixed fuels, as well as the conducted motor experiment, which made it possible to establish the optimal concentration of PO in SDP. It is 1-3%. A further increase in the PO content is impractical, as it gives an insignificant tribotechnical effect, but at the same time, the physical and chemical indicators of the composite marine fuel deteriorate. An engine experiment was carried out on the developed mixed fuels with the addition of PO, which proved that their use in SDVZ does not cause any significant changes in the parameters of the engine's work process and they can be used without restrictions. A full-scale test stand for PNVT was studied, on which the condition of PA plunger pairs was evaluated when working on different types of SDP. Measurements of surface roughness in the nanometer range using high-resolution interferometry methods established the negative influence of NMDP on the surface condition of PNVT plunger pairs. Adding PO to NMDP helps to improve their lubricating ability. Plunger wear decreased by 63.7% compared to the mass loss of the part working on the original NMDT, and the roughness parameters Ra and Rz decreased by 2.75 and 4.44 times, respectively. A highly efficient system of fuel preparation during work at NMDT has been developed, which, due to the implementation of a complex of scientific and technical measures, allows to minimize the process of wear of precision PA pairs due to the addition of PO and simultaneous cooling of NMDP ABHM.