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In a two-stroke diesel engine, a Roots-type blower—also known as a scavenging pump—is driven mechanically by the crankshaft to push fresh air into the cylinder during the period when intake ports are open, sweeping out exhaust gases (scavenging), and then continuing to pressurize the intake manifold once the ports close (acting as a mild supercharger) to improve combustion and power output

https://www.youtube.com/watch?v=0wq1zlT-AUo

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supercharger : increase engine power by forcing more air into the combustion

scavenging pump : helps remove exhaust gases from the cylindee , ensuring efficient intake of fresh air or fuel mixture

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-A supercharger is a mechanically driven air compressor that forces more air into the combustion chamber. It is usually powered by the engine’s crankshaft using a belt, gear, or chain. The increased air supply improves fuel combustion, resulting in more power and efficiency.

-A scavenging pump is used in two-stroke diesel engines to remove exhaust gases and supply fresh air for the next cycle. It ensures complete removal of burnt gases, preventing contamination of the fresh air-fuel charge. This improves efficiency and performance. Scavenging pumps can be of different types, such as uniflow, loop, or cross scavenging.

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Superchargers are primarily used to increase power output by increasing air density.

Scavenging pumps are essential for the operation of two-stroke engines, providing cylinder cleaning and fresh air intake.