Today we will briefly introduce the working principle of gasoline generator set.
The gasoline generator set engine is a machine that converts chemical energy into mechanical energy. Its conversion process is actually a process of working cycle. In simple terms, it is the process of burning the fuel in the cylinder to generate kinetic energy, driving the reciprocating motion of the piston in the engine cylinder, thus driving the connecting rod connected to the piston and the crank connected to the connecting rod to make reciprocating circular motion around the center of the crankshaft and output power.
Now, let's analyze this process: a working cycle includes four piston strokes (the so-called piston stroke refers to the distance between the top dead center and the bottom dead center of the piston): intake stroke, compression stroke, expansion stroke (work stroke) and exhaust stroke.
Intake stroke: In this process, the engine inlet valve opens and the exhaust valve closes. As the piston moves from the top dead center to the bottom dead center, the volume of the cylinder above the piston increases, so that the pressure in the cylinder will be below the atmospheric pressure, that is, vacuum suction will be created in the cylinder, so that the air will be sucked into the cylinder through the intake pipe and the intake valve, and the atomized gasoline from the fuel nozzle will be fully mixed with the air. At the end of intake, the gas pressure in the cylinder is about 0.075-0.09MPa. At this time, the temperature of the combustible mixture in the cylinder has risen to 370-400K.
Compression stroke: In order to make the combustible mixture inhaled into the cylinder burn rapidly, so as to generate greater pressure, so that the engine can generate greater power, the combustible mixture must be compressed before combustion, so that its volume is reduced, its density is increased, and its temperature is increased, that is, there is a need for compression process. In this process, the intake and exhaust valves are closed, and the crankshaft pushes the piston to move one stroke from the bottom dead center to the top dead center, that is, the compression stroke. At this time, the mixture pressure will increase to 0.6-1.2MPa and the temperature can reach 600-700K.
A very important concept in this journey is compression ratio. The so-called compression ratio is the ratio of the maximum volume of gas in the cylinder before compression to the minimum volume after compression. Generally, the higher the compression ratio, the higher the pressure and temperature of the mixture at the end of compression, and the faster the combustion speed. Therefore, the greater the power of the engine and the better the economy. The compression ratio of ordinary cars is between 8-10, but now the latest Polo has reached a high compression ratio of 10.5, so its torque performance is relatively good. However, when the compression ratio is too large, not only the combustion situation can not be further improved, but also abnormal combustion phenomena such as flashover and surface ignition will occur.
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