In an internal combustion engine, a turbocharger is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake air, forcing more air into the engine in order to produce more power for a given displacement.
Cut-away view turbocharger (turbine section on the left, compressor section on the right)
Turbine section of a Garrett GT30 with the turbine housing removed
Cutaway view showing the two scrolls of a Mitsubishi twin-scroll (the larger scroll is illuminated in red)
Transparent exhaust manifold and turbo scrolls on a Hyundai Gamma engine, showing the paired cylinders (1 & 4 and 2 & 3)
In an internal combustion engine, a supercharger compresses the intake gas, forcing more air into the engine in order to produce more power for a given displacement.
Roots-type supercharger (right) on a 2006 GM Ecotec LSJ four-cylinder engine
Internals of a rotary-screw (Lysholm) supercharger
1929 Blower Bentley with the supercharger ("blower") located in front of the radiator
Centrifugal supercharger for a Bristol Centaurus radial engine