One of the reasons why a turbocharged engine has more power than an ordinary engine is that its air exchange efficiency is higher than the natural intake of an ordinary engine. When the air enters the turbocharger, its temperature will rise sharply, and the density will increase accordingly. The intercooler acts to cool the air. The high-temperature air is cooled by the intercooler and then enters the engine. If the intercooler is lacking and the supercharged high-temperature air directly enters the engine, the engine will be damaged or even dead fire due to the excessively high air temperature.
Since the temperature of the exhaust gas discharged by the engine is very high, the heat conduction through the supercharger will increase the temperature of the intake air. Moreover, the density of air will increase in the process of being compressed, which will inevitably lead to an increase in air temperature, thereby affecting the charging efficiency of the engine. If you want to further improve the charging efficiency, it is necessary to reduce the intake air temperature. Data shows that under the same air-fuel ratio conditions, the engine power can be increased by 3% to 5% for every 10 ℃ decrease in the temperature of the charge air.
If uncooled supercharged air enters the combustion chamber, in addition to affecting the charging efficiency of the engine, it is also easy to cause the engine combustion temperature to be too high, causing malfunctions such as knocking, and will increase the NOx content in the engine exhaust gas, causing air Pollution. In order to solve the adverse effects caused by the temperature rise of the supercharged air, it is necessary to install an intercooler to reduce the intake air temperature.