چكيده به لاتين
The initial period of engine warming, one of the most important sources of emission of pollutants, especially unburned hydrocarbons.
Due to the combustion chamber wall being cold during engine warming, the flame quenching rapidly near the cylinder wall and the surface on the piston And the mixture of air and fuel on the sides of the combustion chamber do not ignite the opportunity and are unburned from the combustion chamber which increases the emissions of internal combustion engines during engine warming.
In this study using MATLAB software and numerical solution methods, code is written based on XU7 engine data to determine engine core temperature, cylinder wall temperature at any time, The temperature of the burned and unburned gases in the combustion process in the cylinder, The thermodynamic properties of the gases inside the cylinder and ultimately the effect of wall temperature on flame quenching were obtained. Using this simulation, we can obtain a suitable analysis for transient heat transfer and the effect of wall temperature on flame quenching and combustion products.
Finally by extracting the aforementioned temperatures, the flame quenching distance and the amount of unburned hydrocarbons were obtained within 10 minutes of engine operation and it was found that by controlling the flow rate of the cooling current, the warming time of the engine can be reduced and, as a result, by increasing the warming rate of the cylinder wall and piston crown,The quenching distance and volume of unburned hydrocarbons in the engine are also reduced.
