A turbocharged diesel engine directly drives the propeller, and in order to achieve high propulsion efficiency, a lower rotational speed is required. Medium and high-speed diesel engines drive propellers through gear reducers, which are generally equipped with reverse mechanisms to achieve propeller reversal. However, low-speed diesel engines and some medium speed diesel engines can reverse themselves. Medium and high-speed diesel engines also achieve electric transmission through generators, motors, and propellers. When high power is required, multiple engines can also be used in parallel. When sailing at low speeds, only one main engine can work, thereby improving operational efficiency and reliability. When installing two main engines on the same ship, they are divided into left engine and right engine based on the installation position and propeller rotation.

Turbocharged diesel engines have high thermal efficiency, good economy, easy starting, and great adaptability to various types of ships. After their release, they were quickly used as propulsion power for ships. By the 1950s, diesel engines had almost completely replaced steam engines in newly built ships. Turbocharged diesel engines have become the main power source for civilian ships, small and medium-sized vessels, and conventional submarines. Turbocharged diesel engines can be divided into main engines and auxiliary engines based on their role in ships. The main engine is used as the propulsion power for ships, while the auxiliary engine is used to drive generators, air compressors, or water pumps, etc.

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