The intercooler is used to cool the supercharged air from the supercharger. After the air passes through the supercharger, the pressure and temperature increase. Cooling by the intercooler can reduce the temperature of the supercharged air, thereby increasing the air density, improve the charging efficiency to achieve the purpose of increasing the power of the diesel engine and reducing emissions.
The installation purpose of the intercooler is mainly to reduce the intake air temperature. Perhaps the reader may ask: Why do I need to lower the intake air temperature?
This has to mention the principle of turbocharging. The working principle of turbocharging is simply to use the exhaust gas of the engine to impact the exhaust blades, and then drive the other side of the intake blades to force the air to be compressed and sent to the combustion chamber, because the temperature of the exhaust gas is usually as high as 800 or 900℃, in addition, the turbine body is also in an extremely high temperature state, which will increase the temperature of the air flowing through the inlet turbine end, and the compressed air will also generate heat (because the compressed air molecule distance becomes smaller, it will squeeze and rub against each other to generate thermal energy). If this high-temperature gas enters the cylinder without being cooled, it will easily cause the engine combustion temperature to be too high, and then the gasoline pre-ignition will knock, causing the engine temperature to rise even more. The volume of compressed air will also greatly reduce the oxygen content due to thermal expansion. This will reduce the boosting efficiency and naturally cannot produce the power output that it should.
In addition, high temperature is also an invisible killer of the engine. If you don't try to lower the operating temperature, it is easy to increase the chance of engine failure in the case of hot weather or long-term operation. Therefore, it is necessary to install an intercooler to reduce the intake air temperature.
