Why Do Supercharged Engines Use Intake Intercooling?

Why do supercharged engines use intake intercooling?

Because the supercharger rotates at a very high speed (100,000~150,000 rpm/min), the air will generate heat when it encounters strong friction, and the air temperature can rise to 70~80° after being supercharged by the supercharger. Intake air temperature. So why lower the intake air temperature?

(1) The temperature of the exhaust gas discharged from the engine is very high, and the heat conduction through the supercharger will increase the temperature of the intake air. Moreover, the density of air will increase during 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, you need to reduce the intake air temperature. Data show that under the same air-fuel ratio conditions, the engine power can be increased by 3% to 5% for every 10°C drop in the temperature of the supercharged air.

(2) If the uncooled pressurized air enters the combustion chamber, in addition to affecting the charging efficiency of the engine, it will easily lead to excessive combustion temperature of the engine, causing knocking and other failures, 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.