Dominate South Asia

The power system of the 091-class nuclear submarine is very reliable. In later generations, after more than 20 years of operation and until retirement, there has been no nuclear leakage accident. In contrast, the Soviets, in pursuit of technological advancement, launched There are many types of nuclear reactors, and there are even liquid sodium reactors, which allow nuclear submarines to reach speeds of more than 40 knots, once exceeding the speed of anti-submarine torpedoes. However, the reliability is not high. The Soviet nuclear submarines have suffered many accidents and even won the title of widow maker.

The chief engineer of a nuclear submarine is engaged in nuclear power. It can be seen that the main purpose of this first-generation nuclear submarine is to solve the problem of availability. In terms of power system, it has completely met the standards.

"How noisy is this nuclear submarine?" Tasnim asked.

The noise of a submarine is the most important secret. Except for submarines sold for export, countries will never disclose data for their own use.

In later generations, there were different opinions about the noise of the 091-class submarine. Most of them said that the noise of this submarine was so loud that it was like an underwater tractor. Some people even joked that the American submarine sonar force had made compensation for this. , deafened their ears!

Maybe when the 091 first came out, the noise was really loud. Maybe the Xia-class ballistic missile submarine was noisy because of the extra big bump. However, the 091-class improved version that has been laid with silencer tiles is definitely noisy. It would be ridiculously big.

"At a speed of 5 knots, our noise can reach 100 decibels." Captain Huaxia said.

When talking about the noise of a submarine, you have to talk about the speed, just like people in later generations despise their own fares and gas instead of talking about the speed. A city road with a speed of 30 kilometers per hour is different from a highway with a speed of 100 kilometers per hour. The difference in fuel consumption can be one or two times. If you don't say that speed is better than fuel consumption, then you are acting rogue. If you don't say that speed is better than noise, that is also a statement made by an ignorant military officer.

At 5 knots, silent sailing can be achieved. The background noise of the ocean is about 90 decibels. This nuclear submarine sails silently at low speeds. Only one hundred decibels of noise.

Tasnim nodded: "100 decibels is almost the same as our diesel-electric submarines. What if the speed is higher?"

"At maximum speed, the noise of our submarine is 160 decibels." Captain Huaxia continued.

160 decibels! Tasnim opened his mouth wide. By God, this noise is really loud!

"When maintaining a speed of five knots, our reactor's main circulation pump does not need to be turned on. We only rely on the automatic circulation of the nuclear reactor." Captain Huaxia explained: "When the speed increases, the power of the nuclear reactor must be increased. The main circulation water pump needs to be turned on. One of the main sources of noise is the main circulation water pump, and the other source is the propeller at the tail. "

In fact, not only China's submarines, but also the first-generation submarines of the United States and the Soviet Union are facing such problems. The main circulation water pump is a big source of noise! Therefore, Western countries are improving the self-circulation capabilities of reactors. The advanced nuclear reactors in the United States can even completely self-circulate, eliminating the noisy main circulation water pump.

Another source is the propeller at the tail. When the propeller stirs the sea water, it will form a huge source of noise. Therefore, reduce the noise of these devices. This is the main direction in which nuclear submarines are silent.

China's Type 091 submarine still uses a five-blade propeller. This propeller has low propulsion efficiency and makes a lot of noise.

"We in Pakistan have multi-axis CNC machine tools. We can process advanced seven-blade large side-inclined propellers." said Haziz, who has been observing.

If you want to significantly improve the silent performance of submarines, you need advanced propellers. The seven-blade large-side-inclined propeller is the result of computer design and optimized fluid mechanics. It also requires advanced CNC machine tools to process it.

Now, the new warships started by Pakistan use this kind of propeller.

At the same time, the large number of blades of a seven-blade propeller can further reduce the propeller speed. The lower the speed, the smaller the noise.

What is more advanced than this kind of propeller is the pump jet propeller. In later generations, the British "Vanguard" class and "Astute" class nuclear submarines, the French "Triumph" class nuclear submarines, the United States' "Sea Wolf" class, and the "Virginia" class nuclear submarines "class nuclear submarines all use pump-jet propellers. Because there is a pump casing on the outside, the noise generated by the rotor and the internal flow channel can be shielded, resulting in a greatly reduced noise amplitude.

Pakistan's current technological level is not yet able to produce such advanced pump-jet propellers, but it can already process seven-bladed propellers with large side angles.

"That's great!" After hearing what Haziz said, General Zhang said: "When our nuclear submarines are undergoing mid-term improvements, we hope to be able to replace them with this kind of propeller, which will greatly reduce our noise!"

As the Commander-in-Chief of the Navy, he naturally understands the role of these nuclear submarines, which is the existence of strategic deterrence. In later generations, when the US aircraft carrier supports Taiwan, the only ace in the hands of the Chinese Navy is the nuclear submarine. If it can reduce The noise of these submarines is worth it no matter how much you pay.

"Well, there is no problem at all." Haziz said: "As long as you provide the materials, we will process them in Pakistan."

The propeller is made of pure copper and is cut from copper. Pakistan provides free processing, which is absolutely no problem.

"Okay, I'll inform our technicians to design new propellers for our submarines!" General Zhang couldn't wait.

"How deep is your nuclear submarine?" Tasnim continued to ask.

Another important indicator of nuclear submarines is the diving depth. Lao Maozi is the best at it. Nuclear submarines made of titanium alloy can even dive to a depth of less than 500 meters. At this depth, all torpedoes cannot be used. In other words, as long as a nuclear submarine dives to this depth, it is absolutely safe.

As for the diving depth, the most important thing is the material of the submarine's pressure hull. Only high-strength steel can withstand the huge pressure of seawater.

Hearing the other party's question, the Huaxia captain said with some embarrassment: "Two hundred meters. If there is an emergency, you can also dive to a depth of three hundred meters."

Two hundred meters! Tasnim couldn't help but shake his head: "No, it's too shallow."

During World War II, submarines were able to dive to a depth of more than 100 meters. Now, even conventionally powered submarines can dive to a depth of 200 meters. What is in front of us is a nuclear submarine, and its diving depth is only 200 meters, which shows that the quality of the steel is not up to standard!

When the first Long March 1 was built, it was only in the 1970s. In such a turbulent era, it was already quite difficult to produce steel materials for diving to a depth of 200 meters.

Class 091 adopts the Soviet structure, with a double shell. The pressure-resistant shell inside is made of the best steel found in the country, and it still only has this pressure resistance.

Haziz was also frowning. It seemed that if Pakistan wanted to build a nuclear submarine, the only thing it could import from China was the nuclear reactor technology and the design of the entire hull.

After getting out of the nuclear submarine, I immediately felt refreshed. Although the nuclear submarine had not yet dived to the bottom of the sea, the smell inside was still lingering. After coming out, along the passage of the cave, there was a constant sea breeze, which was quite comfortable.

Sitting in the returning car, the Pakistani personnel were in constant contemplation.

"Do you want to build your own nuclear submarine?" It was General Zhang who broke the silence.

Today, senior officials of the Pakistan Navy secretly visited one's own nuclear submarine. What is the other party's purpose? What Pakistan lacks in its arsenal is this kind of nuclear submarine! Therefore, Pakistan should want to build nuclear submarines.

"Yes." Haziz said: "In order to protect the safety of our aircraft carriers, we need high-performance underwater submarines. Diesel-electric submarines are always emergency. We must have our own nuclear submarines."

After finishing speaking, Haqiz and the other Pakistani personnel in the car looked at each other and continued: "We hope to obtain the overall design of the submarine and nuclear power technology from your country."

It all depends on the other party's statement. After all, the nuclear power system of this submarine is the most critical system of the nuclear submarine. When the relationship between the Soviet Union and China was the closest, Khrushchev did not agree to export nuclear submarine technology.

When General Zhang heard what Haqiz said, sure enough, his expression calmed down and he thought seriously. There was nothing else in the entire carriage except the sound of the engine.

"Your nuclear submarine technology is completely independently developed." Finally, General Zhang expressed his position: "It has nothing to do with China."

Hearing what the other party said, Haziz's eyes also lit up: "Yes, we in Pakistan already have nuclear power plants on land and have mastered a lot of nuclear power plant technology. After miniaturization, they can be stuffed into nuclear submarines. It has nothing to do with you. ”

China owes Pakistan a lot, especially this time. Pakistan took the initiative to help China recover the islands. This is a strategic friend.

Even if Pakistan has nuclear submarines, it will not pose a threat to China. Pakistan and China will have a win-win outcome. It's just that if China really exports nuclear submarine technology, it will make the West dissatisfied. Therefore, when making external claims, it must put aside its relationship with China.

"We in Pakistan can start manufacturing nuclear submarines in our own factories. We have now developed new steel. The yield strength is about 850MPa. Using this steel to manufacture nuclear submarines can reach a diving depth of at least 400 meters." Haziz continued. .

When Mhamad visited Moscow, he brought some good things, including this new steel. The entire set of technology, including the factory, was packaged back. Pakistan can produce such strong steel! (To be continued ~^~)