What is the primary function of superchargers in diesel engines?

The primary function of superchargers in diesel engines is indeed to increase power output. A supercharger compresses air that is fed into the engine's cylinders. By forcing more air into the combustion chamber, it allows for a greater amount of fuel to be burned during the combustion process. This means that the engine can produce more energy or power from the same displacement, effectively enhancing its performance.

Increasing power output is crucial for diesel engines, especially in applications where heavy loads or high performance is required. The improved air intake provided by a supercharger allows the engine to operate more efficiently and with increased power levels, demonstrating the significance of superchargers in performance enhancements.

Other options, though they contain relevant information, do not encapsulate the primary role of superchargers effectively. For instance, while forcing more air-fuel mixture into cylinders can be associated with superchargers, it is more about increasing air capacity in this context. The mention of rotary or centrifugal types pertains to the design but does not focus on the functional aspect. Similarly, while they do help force more air into cylinders, the emphasis should be on the resultant increase in power output.