I make a popular science video and all the emperors learn from it!

[Popular science continues.] 】

[4. The era of diesel engine ships. 】

[At the beginning of the 20th century, engineers developed engines that could not only ensure high speed of navigation, but also save money, that is, internal combustion engines that used diesel as fuel. 】

[History: Diesel Engine Power Period]

[Rudolf Diesel, the inventor of the diesel engine, originally wanted to use it in cars, but it did not materialize until his death. 】

[However, with the development of petroleum, diesel engines have been the first to be applied in ship power propulsion. 】

[The earliest diesel engine to be used in ships was the diesel engine ship "Vanda1" built in 1903. 】

[The first diesel-powered warship was the "Egyptian Irrette" submarine built in 1904, with two boats of the same type. 】

[Due to the high thermal efficiency, economy and reliability of diesel engine, it has gradually been widely used. 】

[At the end of the 40s of the 20th century, the tonnage of diesel engine ships has surpassed that of steam engine ships. 】

[The early diesel engine, mainly used in inland ships and coastal submarines, after the initial stage of development, the technology of the diesel engine has become more and more mature, and the power and reliability of the single engine have been greatly improved, creating a foundation for the diesel engine powered ship to sail to the sea and the ocean. 】

Nowadays, diesel engines have become the standard power configuration of marine ships. 】

【Introduction:】

[The main driving power of a gas turbine ship comes from the internal combustion engine, which is usually a diesel generator. 】

[Marine diesel engine has high thermal efficiency, good economy, easy starting, and great adaptability to all kinds of ships, and is quickly used as ship propulsion power after its introduction. 】

[By the 50s of the 20th century, in newly built ships, diesel engines almost completely replaced steam engines. 】

Marine diesel engines have been the main power for civilian ships, small and medium-sized ships and conventional submarines (see ship power plant). 】

According to its role in the ship, marine diesel engines can be divided into main engine and auxiliary engine. 】

[The main engine is used as the propulsion power of the ship, and the auxiliary engine is used to drive the generator, air compressor or water pump, etc.] 】

[Analysis of the development trend of modern ship gas turbine:]

[According to the statistics of the number of gas turbines loaded on board, the top 4 are destroyers, frigates, hovercraft, and cruisers;]

[According to the total power meter of the gas turbine loaded on the ship, it is frigates, destroyers, hovercraft, and speedboats;]

[According to the number of ships equipped with gas turbines, they are frigates, destroyers, hovercraft, and speedboats. 】

[From the statistical results, it can be seen that destroyers, hovercraft, and high-speed boats are the main markets for marine gas turbines. 】

[The number of applications of marine gas turbines on military ships is significantly greater than that of civilian ships. 】

[Through the analysis of the development trend of modern marine gas turbines, it can be seen:]

[(1) At present, the development focus of marine gas turbines is one large (high-power marine gas turbine) and one small (small-grade power marine gas turbine), especially high-power gas turbines, and the models are more concentrated. 】

[(2) High-power marine gas turbines will be the main model used by naval ships in the next 10~15 years. 】

【......】

[Comparison of the advantages and disadvantages of steam turbines, diesel engines, and gas turbines:]

[1. Steam turbines. 】

[Before World War II, steam turbines were the only choice for almost all battleship power. 】

[However, due to the low conversion efficiency, large volume, and low output power of the steam turbine, it is increasingly unable to meet the increasing power needs of warships. 】

[After World War II, steam turbines could only be seen on nuclear-powered warships, which were already very few. 】

[2. Diesel engine. 】

[The biggest advantage of diesel engine over steam turbine is low fuel consumption and fast starting speed. 】

[But there is also a big problem with the diesel engine, that is, the power of the single engine is insufficient. 】

[If you want to increase the power of the diesel engine, its volume will be greatly increased. 】

[3. Gas turbines. 】

[Gas turbines are the rookie of ship power. 】

Since its launch, gas turbines have been favored by countries around the world and have quickly become the mainstream power of modern large and medium-sized ships. 】

[The gas turbine has the advantages of large single power, small size, low fuel requirements, can use a variety of fuels, fast start-up speed, good maintenance, low vibration and noise, suitable for anti-submarine operations, and can realize modularity. 】

[However, there are drawbacks to gas engines. 】

[First of all, the gas turbine requires a large air flow, which requires the ship to consider the engine intake tract when designing. 】

[Secondly, the design and production of gas turbines are very difficult, so they are also very expensive. 】

[In addition, the fuel consumption of gas turbines is also quite high, especially in the case of low-speed sailing, the fuel consumption is so large that it is a headache. 】

[It can be seen that the fuel consumption of diesel engine is low, but the power is insufficient, and the power of gas turbine is high, but the fuel consumption is too high. 】

[In order to solve this contradiction, people thought of installing diesel engines and gas turbines on warships at the same time, and specifically determining which power to use according to different navigation conditions. 】

[According to whether the two engines need to work at the same time, it can be divided into two working modes: diesel-fuel alternation (CODOG) and diesel-fuel combined (CODAG). 】

【......】

[In this way, the warship can be driven by a diesel engine at low speeds, and by a combined diesel engine and a gas turbine at high speeds.] 】

[However, new problems have emerged.] 】

[This drive method has quite high requirements for the design and manufacture of the gearbox of the ship. 】

【......】

I thought the steamship was good enough, but I didn't think there would be a diesel ship."

"This is a good thing, because it shows that there is still room for improvement in our shipbuilding technology. "

"Steam turbines, diesel engines, and gas turbines have their own advantages and disadvantages, and we still have to improve step by step, and we can't dream of climbing to the sky in one step. "

"By the way, did Your Majesty build a steam engine?"

“......"

The ancients of each dynasty expressed their own opinions. (If you read a violent novel, go to Feilu Novel Network!)

They also understood a truth.

No matter how good the technology is, it also needs enough practice and accumulation, and it is impossible to master it in a short time.