A supercharger is a device used by a piston aircraft engine to increase the intake pressure of the cylinder. The air before entering the engine cylinder is first compressed by the supercharger to increase the density of the air, so that more air is filled into the cylinder, thereby increasing the engine power. In addition to outputting a larger take-off power, an engine equipped with a supercharger can also improve the altitude characteristics of the engine. Automobile supercharger: The so-called supercharging is a technology that pre-compresses the air before feeding it into the cylinder to increase the air density and increase the intake air volume. The purpose is to increase the amount of charge, increase power, improve economy, and improve emissions.