THEORETICAL ESTIMATE OF TOTAL SPECIFIC ENERGY CONSUMPTION OF TRACTOR UNITS AT OPERATION ON DIESEL MIXED FUEL
It is known that diesel mixed fuel (DMF) obtained by mixing vegetable oil and commodity mineral diesel fuel is the most accessible type of biofuels for agricultural producers. Vegetable oils from the seeds of various oilseeds (canola, camelina, oilseed radish, mustard, linseed, safflower, colza, soybean, and others.), which is almost completely dissolved in the fossil fuel with the formation of finely dispersed emulsion was used as a biological component of the DST. Cardinality, fuel-economic and ecological indicators of a tractor diesel engine and energy costs machine-tractor unit (MTU) were studied in the course of performance of production functions. The methodology, which allows to calculate the total specific energy consumption of MTU at work on DMF for the effects of not only the design, operating and other parameters of the diesel engine and tractor, soil resistance, and calorific properties of composite propellant, depending on the percentage of biological and mineral components is proposed. For example calculation of total specific energy consumption of the tractor unit (МТЗ-82+ПЛН 3-35) for his work in various modes, and soy- mineral fuel ratio of biological and mineral components of 25:75, 50:50, 75:25 is made. The calculation results showed that when the tractor unit in the mode of the nominal speed of the crankshaft of the tractor diesel common specific energy consumption are: mineral fuel - 137.5 MJ / ha, composite propellant 25:75 - 137.9 MJ / ha, 50: 50 - 138.3 MJ / ha, 75:25 - 138.7 MJ / ha.