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In fact, although the request put forward by the high-level was a bit abrupt, Fan Wuxian could understand some of their hardships after thinking about it carefully.

Since the advent of nuclear bombs and long-range missiles, it means that several nuclear powers have the strategic advantage of killing people thousands of miles away and winning a decisive victory in the midst of the battle, but after all, the land-based ballistic nuclear missiles have relatively obvious targets, and they are easy to be found out by the opponents.

It is precisely for this reason that everyone has set their sights on the bottom of the sea, and the intercontinental nuclear missiles launched by nuclear submarines will obviously pose a greater threat to the enemy country, and these nuclear killers cruising at the bottom of the ocean are difficult to be caught by others, and they also have the opportunity to get as close as possible to the enemy country, so the nuclear submarine has become the only magic weapon for maintaining a country's nuclear deterrent capability.

Especially for a nuclear power with a very small territory like the United Kingdom, there is no place on land to build a nuclear bomb base, so they have long ago moved their brains to the bottom of the sea, using super-large and ultra-advanced nuclear submarines to maintain their status as a nuclear power unshaken.

Not long ago, for the first time, the British Navy showed the public a schematic diagram of the construction of the first Astute-class nuclear-powered attack submarine. In front of the first batch of journalists allowed to visit, British naval officials boasted that this was the first new nuclear submarine built by Britain in nearly two decades, and it was by far the most concealed submarine in the world.

Next, the British Navy plans to build eight Astute-class nuclear submarines to replace all of the fast-class nuclear submarines in service and some of the Trafalgar-class nuclear submarines.

Due to the peculiar mode of combat, the submarine needs to be hidden in the depths of the ocean for a long time. Therefore, stealth performance has become the main factor in whether the submarine can survive in the complex and cruel marine war environment. There are two major treasures for submarines to improve stealth performance, one is to reduce the noise level of the submarine itself, and the other is to reduce the reflectivity of the submarine to radar waves and sonar detection, and to reduce the infrared and magnetic characteristics of the submarine.

It is said that the British "Astute" class nuclear submarine, which is about to start construction, is equipped with a water-jet propulsion device, and is the first submarine in the world that does not use propeller propulsion, and the elimination of propeller noise greatly improves its anti-reconnaissance capability, so that the noise generated by it when sailing is smaller than the movement of a small whale, only 90 to 100 decibels.

In terms of stealth technology for nuclear submarines, the United States and Russia have always been at the forefront of the world's military powers, and the noise of US submarines has always been relatively low, with the noise of the Los Angeles-class nuclear submarine being 128 decibels, and the noise of the Ohio-class nuclear submarine and the Seawolf-class attack nuclear submarine being reduced to 100 to 110 decibels, which is very close to the noise level of the natural ocean.

In order to improve stealth, the Ohio-class nuclear-powered ballistic missile submarine of the US Navy adopts a natural circulation pressurized water reactor on the boat, that is, the main circulation pump can be omitted when sailing at medium and low speeds, thereby reducing mechanical noise. The mechanical device on the submarine adopts a floating raft shock absorber, and the other noisy equipment on the boat is equipped with sound insulation shielding, and the outside of the hull is covered with sound absorbing tiles. In addition, stealth measures such as the elimination of infrared signatures, the elimination of magnetism and the reduction of waste emissions are also used.

As far as Russian submarines are concerned, they have fully realized the silic tiling of submarines, that is, all nuclear submarines are equipped with silencing tile equipment developed and produced by Russia, so the noise of Russian submarines has been reduced to about 115 decibels.

As for the cash Kursk, due to the second-generation silencing tile with a thickness of 150 mm on the surface of the hull, and the use of high-damping materials to make propellers, air curtain noise reduction, titanium alloy steel hull and the installation of anti-acoustic sound source systems and other unique technologies, its stealth ability is more powerful, it is said that it can reach below 100 decibels, and it is difficult for the enemy to detect it whether in water or space.

China's nuclear submarine technology has always been very mysterious, and some Western military experts speculate that because China has developed a shark skin imitation technology on the surface of the hull of the boat, that is, a silencing tile made by the principle of bionics and similar to the structure of shark skin, China's new submarine can not only significantly absorb the noise generated by the submarine itself, but also absorb and weaken the enemy's sonar detection sound waves, and then be able to compete with the United States, Britain and Russia and other military powers in the field of submarine stealth.

However, Fan Wuxian expressed some doubts about this, some Western statements are always a little exaggerated, and he feels that he is still familiar with some domestic situations, so he does not think that the authenticity of this imitation shark skin technology is very large, otherwise he does not need to let himself find a chance to get some of the skin of the Kursk.

At present, the use of bionics technology in nuclear submarines is mainly in two aspects, one is the improvement of power, and the other is the improvement of skin technology.

The improvement in motivation is mainly to learn from the squid.

The squid is known as an underwater rocket, its body is like a rocket, and when it advances, the tail is forward, and the head and tentacles are stacked together to form a streamlined shape. Its locomotor organ is a funnel-shaped tube underneath the abdomen. Its tail is forward, its head and tentacles are clinging to a long band, and as soon as its muscles contract, it spews out the water that enters the funnel, resulting in a great reaction force, like a rocket, moving forward quickly.

The squid's water jet is a good power plant, which allows the squid to travel normally 70 kilometers per hour, and the maximum speed can even reach 150 kilometers per hour, as long as the position of the relevant part of the nozzle is changed, the squid can advance and retreat freely.

If a submarine is equipped with a squid-like waterjet propulsion device in the submarine, and water is sprayed outward from the tail of the submarine at high speed through the jet pipe, the hull can be propelled forward at high speed by a strong reaction force, and its propulsion efficiency will far exceed that of the propeller.

In fact, the Astute-class nuclear submarine under construction by the British Navy uses this power technology, but it has not yet taken shape, and everyone is not sure how effective it will be, and whether it can really be as good as imagined.

But if this technology is realized, the noise of the Astute-class nuclear submarines will definitely be surprisingly small.

As for the outer skin of the nuclear submarine, it is generally used to improve the speed, performance and safety factor of the submarine by using various characteristics of the dolphin. Dolphins are strong swimmers in the sea and can swim at speeds of about 50 kilometers per hour. It has such a high swimming speed but does not consume much power, which is both effortless and fast, mainly for two reasons: one is its streamlined body shape, and the other is its special skin structure.

The amount of drag on a moving object in water is related to the flow structure around the object. If a so-called laminar flow is formed, and no whirlpools are generated, the water resistance is minimal, otherwise turbulence is caused, and the resistance will increase, affecting the speed.

The dolphin's fusiform body and smooth epidermis do not cause serious turbulence, and its special skin structure can also turn turbulence into laminar flow, which greatly reduces the frictional resistance of the water.

The inside of the dolphin's epidermis is a sponge structure with many papillae, and the papillae are filled with fluid. This structure is functionally like countless thin tubes filled with fluid, and when the surface of the skin is subjected to turbulent pressure changes, the fluid flows out or into the thin tubes with this change in pressure.

In this process, part of the energy of the turbulent flow is absorbed, thus turning the turbulent flow into a laminar flow. According to the structural characteristics of dolphin skin, artificial dolphin skin is imitated, and a smooth and soft epidermal layer, an elastic dermis layer and a support layer in contact with the deck are made. If the artificial dolphin skin is wrapped around the surface of the torpedo, the water resistance of the torpedo is reduced by more than half.

At present, scientists have studied the silencing tile of the submarine according to the dolphin principle, which is made of rubber, about 30 millimeters thick, and has a cavity with a diameter of about 3.5 millimeters.

Its working principle is not complicated, mainly using sound waves to oscillate in the cavity to reduce the intensity of sound wave reflection and achieve the purpose of invisibility.

First of all, it can absorb the sonar waves emitted by the opponent's active radar, that is, the damping effect of the silencing tile material and the effect of the cavity or filling in the tile can change the shape of the sound wave emitted by the opponent, and the sound energy will be converted into heat energy and consumed, so that the refracted sound wave energy will be greatly reduced, and the purpose of drastically reducing the active sonar detection will be achieved.

Secondly, it is able to isolate the internal noise of the submarine from radiating outward. Noise is a big taboo in submarine underwater operations, especially the large tonnage, large size, and loud noise of nuclear submarines, which are easy to be detected by the other side at a very long distance, and the silencing tile can partially alleviate the contradiction in this regard.

The submarine is wrapped with layers of silencing tiles, which is equivalent to wrapping a radio with a cotton jacket, and the sound is significantly weakened. In this case, the outward radiation of the noise inside the boat is naturally greatly suppressed.

Therefore, imitating the special skin structure of dolphins, the developed silencing tiles are fully combined with the bionic skin similar to the skin structure of dolphins, and a new generation of submarine skins has been developed, which can make submarines play a greater role.

According to the latest information, the outer skin of the Kursk uses this state-of-the-art biomimetic technology, so the high-level special explanation that Fan Wuzhi must find a way to get some samples, which is very important for domestic researchers.

Fan Wuxian also intended to do it at this time, but according to the situation in the past two days, the scene was heavily guarded, which really made him feel a little at a loss, besides, among the divers who could get close to the target, they were all foreigners, and there was nothing he could do about it!

It would be impossible to get the salvaged object unless you dived into the water yourself, or if it was possible to do it.

Just thinking about wanting to dive into such a deep seabed, Fan Wuxi felt a little unsteady, after all, the old people have said that it is better to go up the mountain than to go to the sea, once you dive in, it will be difficult to say what will happen later.

It's a difficult decision to make.

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