Advantages of gas turbines as warship power

In the selection of warship power schemes, the main competitors of gas turbines are marine diesel engines and marine steam turbines. However, since the inherent advantages of gas turbines are more consistent with the performance requirements of warship power systems, gas turbines have become the only choice for the development of warship power systems in various countries. The old naval powers such as the US Navy, the British Navy, and the main surface warships of the Japanese Maritime Self-Defense Force have already completed the power gas turbine.

The first advantage of a gas turbine is its high power density. Under normal circumstances, the same power of the gas turbine is one-third to one-fifth of the diesel engine, about one-fifth to one-tenth of the steam turbine. This is caused by the delicate continuous rotating thermodynamic cycle structure of the gas turbine itself. It is small in size and large in power, and is very suitable for small warships with small subdivision and high speed requirements.

The second advantage of a gas turbine is its fast start-up speed. Although the speed of the gas turbine is the highest of the three power systems, the maximum speed can be reached in 1-2 minutes with the help of the starter because the entire rotor is very light. While the diesel engine is driven by the reciprocation of the piston, the acceleration is slower, and the steam turbine is “reactive”. It may take up to an hour for the entire system to reach the highest power output. The starting speed has a direct impact on the warship's wartime dispatch and anti-submarine warfare acceleration and deceleration performance.

The third advantage of gas turbines is that the low frequency components of the noise are very low. Since the gas turbine itself is in high-speed stable rotation, the noise generated is more high-frequency howling. The reciprocating piston of the diesel engine produces a large number of low-frequency mechanical vibration noise, which just caters to the characteristics of the ocean easily spreading low-frequency noise, which makes the warship easy to be detected by enemy sonar. Therefore, the diesel engine power is particularly unsuitable for the anti-submarine warships as a power system.

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