Abstract
The increase in the power, economic and environmental performance of modern internal combustion engines is largely due to the improvement of the system that controls the gas exchange processes. Its characteristics determine the quality of filling and cleaning of the cylinders in various operating modes, the loss of power for gas exchange and, consequently, the indicator and effective indicators of the engine. The issues of mathematical modeling of gas exchange processes in combination with the study and improvement of the gas distribution mechanism are considered. The results of experimental and computational studies of gas exchange of tractor diesel are presented. Reserves for improving the gas exchange and the engine as a whole are identified based on the choice of optimal valve timing phases and valve motion laws. They provide a reduction in the modulus of the average pressure of the pump passages in the range of operating modes by 12 - 14 %, which contributed to a decrease in the specific effective fuel consumption by 1.4 ÷ 2.2 g/kWh. The above allows us to conclude that the use of a generalized step-by-step numerical method for synthesizing the law of motion of a pusher with an upper stand allows us to obtain the maximum efficiency characteristics of the gas distribution in the presence of a number of restrictions.
Highlights
The increase in the power, economic and environmental performance of modern internal combustion engines is largely due to the improvement of the system that controls the gas exchange processes
The valve gap is the main source of aerodynamic resistances in the channels of the cylinder head: it accounts for up to 75-90% of the total channel resistance [1]
The numerical method of mathematical modeling of gas exchange processes in combined internal combustion engines allows us to establish the relationship between the working processes in the gas-air path and the parameters and characteristics of the gas distribution mechanism. This relationship is the basis for optimizing the elements of the gas distribution mechanism
Summary
The increase in the power, economic and environmental performance of modern internal combustion engines is largely due to the improvement of the system that controls the gas exchange processes. The numerical method of mathematical modeling of gas exchange processes in combined internal combustion engines allows us to establish the relationship between the working processes in the gas-air path and the parameters and characteristics of the gas distribution mechanism (gas distribution phases, the law of movement of the pusher, flow sections at the inlet and outlet, gear ratios, thermal gaps, the number of valves). This relationship is the basis for optimizing the elements of the gas distribution mechanism. There are no restrictions on the number of elements in which processes are considered as quasi-stationary or non-stationary, and on the possibility of their connections with each other
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