Chapter 880： AIP submarine

The entire World War II was an era in which science and technology advanced by leaps and bounds, and all military-related science and technology were developing rapidly.

In World War II, Germany adopted the wolf pack tactics, and the Allied forces have reached the extreme in the development of underwater audio equipment. Sonar, a special equipment for detecting underwater sounds, has developed rapidly and noisy submarines are often found. .

In this way, higher requirements are placed on submarines.

Now the XXI-class submarine equipped by Germany has been improved. The biggest difference is that it has abandoned the previous ship type and changed to the elongated droplet shape that is common in later generations. This submarine has excellent underwater navigation capabilities and is the first A submarine whose underwater speed exceeds the surface speed.

The same is true for this nuclear submarine developed from it.

"If it is a diesel-electric submarine, the diesel engine is the biggest source of noise. Now we use nuclear power. The circulating pump in the nuclear reactor and the steam turbine behind are the biggest sources of noise. We adopt various solutions, such as arranging shock-absorbing bases. Wait, to reduce the noise."

The speaker is a submarine designer. In the development of this nuclear submarine, close cooperation is required from all parties. The design of nuclear power is a joint cooperation between nuclear power experts and submarine experts.

"In addition to the noise of the submarine's engine, the other main noise is the propeller." Cyric at this time continued to transform into an expert.

These, of course, designers have noticed, but they have not found a suitable plan, but Cyric from the later generations of course is clear about this.

The hull of the boat has only begun to be built, and the propellers and other components at the tail are not in place, but, don’t look at it, Cyric also knows that it must be the most common three-blade propeller.

"If you want to reduce the noise of the propeller, you have to reduce the speed, but if you reduce the speed, the thrust will be insufficient. This solution is to increase the number of blades." Cyric said: "The current three-blade propeller is backward. Yes, we can change it to a seven-blade or nine-blade propeller. At the same time, the propeller can also be changed to a large skew structure."

After that, Cyric drew on a drawing in this hot factory.

The propellers are all odd-numbered blades. This is to eliminate the vibration caused by symmetry. At the same time, the large skew is a solution to reduce noise.

However, how to skew, especially how to process, is a huge problem. In later generations, it is realized by multi-axis linkage CNC machine tools.

Cyric just proposed a kind of idea, and then left it to these engineers to figure out how to do it. It doesn't need to reach the level of later generations, as long as it is more advanced than the present, that's enough.

"As for the hull, I suggest that a layer of rubber-made noise reduction tiles can be laid on the hull, which can continue to prevent the internal noise from spreading out. How to make it specifically requires everyone’s teamwork. It does not have to be installed in the current one. On the submarine, technical pre-research can be carried out to prepare for the submarine behind."

"Head Cyric, your wise vision is admirable." Heisenberg said.

Head Cyric is an all-rounder. No matter what, he can come up with unique insights. More importantly, he is completely correct after verification.

Propellers need experts in fluid mechanics, and sound-absorbing tiles need experts in materials, and work hard in accordance with the direction proposed by Cyric.

Cyric continued to walk on the berth, watching the flames of the arc splashing, and watching the submarine's components being formed, with emotion in his heart.

Nuclear submarines, in addition to being used to attack enemy warships, are more prepared for future nuclear bombs.

This is a long road. The test explosion of nuclear bombs will take a few years, and the miniaturization will take a long time. The installation of a launch vehicle on a submarine will have to overcome many problems.

However, no matter how big the investment is, these technologies must have a breakthrough. After all, this is the capital for later generations to dominate the world, ballistic missile nuclear submarine!

Nuclear submarines are brand-new equipment, huge displacement, will drive torpedoes, sonar and other aspects of progress, Germany will continue to maintain breakthroughs in submarine technology.

"Once this kind of submarine is put into use, it will bring a revolutionary breakthrough. It will sail underwater from the time it leaves the port until it returns." Dunnitz exclaimed: "It's a pity that the cost is too high. It would be great if our conventional submarine can also sail underwater for a long time."

The cost is high, and the number is destined to not be too many. You must know that in Dunnitz's plan, there will be hundreds of submarine forces.

Before leaving, after hearing Dunnitz’s sigh, Cyric suddenly thought of another thing, a low-cost submarine transformation program, known as the AIP technology of nuclear submarines in poor countries!

In fact, before and after World War II, Germany and the Soviet Union were involved in the research of AIP power plants.

For example, in 1935, the 18th Central Design Bureau of the Soviet Union proposed to use the AIP system on submarines and test it on the M-92 submarine, and obtained a lot of test data.

At the same time, during World War II, the German Walter Company also tried to use compressed hydrogen peroxide in submarines as a source of underwater oxygen for diesel engines.

Conventional power submarines use diesel engines. In addition to diesel fuel, the work of diesel engines is oxygen. Under water, below the depth of the snorkel, and without a source of oxygen, the diesel engine cannot start.

Therefore, as long as the oxygen is carried, the diesel engine can continue to work, and the exhaust gas can be discharged outside the submarine to prevent the people in the submarine from suffocating.

Carry only ordinary oxygen That requires a huge volume, so you can carry liquid oxygen to reduce the volume and increase the range.

However, liquid oxygen is not easy to prepare, and it is also difficult to store at low temperature.

In this way, the substitute for liquid oxygen is hydrogen peroxide, which can be decomposed into oxygen and water. When the submarine is running underwater, the hydrogen peroxide is heated by the thermal energy of the diesel engine, and then oxygen is produced for the diesel engine to use. Later, Germany built a small number of such AIP submarines.

However, Cyric does not like this kind of thing, because hydrogen peroxide is extremely unstable when it is converted to oxygen!

From a technical point of view, to make improvements on existing submarines, you can even insert a tank and add a canister of hydrogen peroxide. However, Cyric doesn’t like this technology. The submarine was originally Risking their lives to perform tasks, let alone increase their unsafe factors.

Therefore, it is better to choose the technical solution used by the later generations of China.

"Everyone, have you heard of a Stirling engine?" Cyric said.