The power system of the 091-class nuclear submarine is very reliable. In later generations, after more than 20 years of operation, no nuclear leakage occurred until after its retirement. In contrast, in order to pursue advanced technology, the Soviets launched many nuclear reactors, and even liquid nano reactors, which allowed the nuclear submarine to reach a speed of more than 40 knots, which once exceeded the speed of anti-submarine torpedoes. However, the reliability was not high. The Soviets' nuclear submarines had many accidents and even won the title of widow manufacturer.

The chief engineer of nuclear submarines is engaged in nuclear power. It can be seen that this first generation of nuclear submarines mainly solve the problem of existence and none, and has completely met the standards in terms of power systems.

"How much noise is this nuclear submarine?" Tasnim asked.

The noise of a submarine is the main secret. Except for the exported submarines, the data used by countries will never be mentioned.

In later generations, there were many different opinions about the noise of the 091-class submarine. Most of the statements were that the noise of this submarine was quite loud, just like an underwater tractor. Some people even joked that the American submarine sonar soldiers had compensated for it, which deafened their ears!

Perhaps, when the 091 first came out, the noise was indeed very high. Perhaps, the Xia-class ballistic missile submarine had a big bump, and the noise was not small. However, the 091-class improved model with a sound-silence tiles had been laid, so the noise would never be ridiculously loud.

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

When talking about the noise of a submarine, you have to say the speed, just like people in later generations dislike their own car fares, and not the speed, the urban road with a speed of 30 kilometers per hour and the highway with a speed of 100 kilometers per hour. The fuel consumption is one or two times different. Not to mention the speed comparison fuel consumption, it is just a rogue. Not to mention the speed comparison noise, it is also a military blind saying.

At 5 knots, silent navigation can be achieved. The background noise of the ocean is about 90 decibels. The silent navigation of this nuclear submarine at low speeds is only 100 decibels.

Tasnim nodded: "100 decibels, it's almost the same as our diesel-electric submarine. What if the speed is higher?"

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

160 decibels! Tasnim opened his mouth wide, Allah was on it. The noise is really not small!

"When maintaining a five-knot speed, our reactor's main circulation water pump does not need to be turned on, but only relies on the automatic circulation of the nuclear reactor." Captain Huaxia explained: "When the speed increases, the power of the nuclear reactor needs to be increased, and the main circulation water pump needs to be turned on. One of the main sources of noise is this main circulation water pump. Another source is the propeller at the tail."

In fact, not only the Chinese submarines, but also the first generation of submarines from the United States and the Soviet Union, are facing such problems. The main circulation water pump is a great source of noise! ​​Therefore, Western countries are improving the self-circulation capability of reactors, and the advanced nuclear reactors in the United States can even completely self-circulate to remove the loudest main circulation water pump.

Another source is the propeller at the tail. When the propeller stirs the sea water, a huge noise source will be formed. Therefore, reducing the noise of these devices is the main direction of the nuclear submarine silencing.

China's Type 091 submarine still uses five-blade propellers, which have low propulsion efficiency and huge noise.

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

To make the submarine's silence performance significantly improve, it is necessary to have advanced propellers. The seven-blade large-side inclined propellers are the result of computer design and optimized fluid mechanics solutions, and it also requires advanced CNC machine tools to be processed.

Now, the new warships that Pakistan started construction themselves use this kind of propeller.

At the same time, the larger the number of blades of the seven-blade propeller, the more the speed of the propeller can be further reduced. The lower the speed, the smaller the noise.

What is more advanced than this propeller is the pump jet thruster. In later generations, the British "Avant-garde" and "Agility" class nuclear submarines, France's "Triumph" class nuclear submarines, the United States used pump jet thrusters in the "Seawolf" class and "Virginia" class nuclear submarines. Because there is a pump shell outside, it can shield the noise generated by the rotor and the inner flow channel, resulting in a greatly reduced noise amplitude.

Pakistan's current technological level is still unable to produce such advanced pump-jet propellers, but the seven-blade large side oblique propeller can be processed.

"That's great!" Hearing Haziz's words, General Zhang said: "When our nuclear submarine is undergoing mid-term improvement, we hope to replace it with this kind of propeller to greatly reduce our noise!"

As the commander-in-chief of the navy, he naturally knew that the role of these nuclear submarines was the existence of strategic deterrence. In later generations, when the US aircraft carrier supported Taiwan, the only ace in the hands of the Chinese Navy was nuclear submarines. If the noise of these submarines could be reduced, it would be worth it no matter how much it paid.

"Well, there is no problem at all," said Haziz. "As long as you provide the materials, you can go to our Pakistan to process them."

The propeller is pure copper and is cut out with copper. Pakistan provides processing for free, which is completely fine.

"Okay, I'll notify 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, which is the most convenient way for Russians to play. Nuclear submarines made of titanium alloy can even dive to a depth below 500 meters. At this depth, all torpedoes cannot be used. In other words, as long as nuclear submarines dive to this depth, they will be absolutely safe.

The most important thing about the diving depth is the material of the submarine's pressure-resistant shell. Only high-strength steel can withstand the huge pressure of seawater.

Hearing the other party’s question, the captain of China said embarrassedly: “If there is an emergency, you can dive to a depth of 300 meters.”

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

In the Second World War, submarines could dive to a depth of more than 100 meters, and now, even conventional powered submarines can dive to a depth of 200 meters. The one in front of us is a nuclear submarine, with a dive depth of only 200 meters, which means that the quality of the steel is not up to standard!

At that time, the first Long March 1 was built in the 1970s. In such a turbulent era, it was not easy to produce steel for diving 200 meters deep.

The 091 class uses the Soviet structure, double shells, and the pressure-resistant shell inside. It uses the best steel found in China, but it still has only such compressive resistance.

Haziz also frowned. It seems that if Pakistan wants to build a nuclear submarine, the only thing that can be introduced from China is the technology of this nuclear reactor and the design of the entire hull.

After drilling out of the nuclear submarine, I felt a refreshing feeling. Although the nuclear submarine had not yet dived to the bottom of the sea, the smell inside was still lingering. After coming out, the sea breeze kept blowing along the passage of the cave library, which was quite comfortable.

Sitting in the return car, the Pakistani personnel were constantly pondering.

"Your side wants to build a nuclear submarine by itself?" Or General Zhang broke the silence.

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

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

After saying that, Haziz looked at each other with the rest of the Pakistani personnel in the car and continued: "We hope to obtain the overall design of the submarine and nuclear power technology from your country."

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

When General Zhang heard Haziz's words, he calmed down his expression on his face and thought seriously. There was nothing else in the entire car except the sound of the engine.

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

Hearing the other party's words, Haziz's eyes lit up: "Yes, we Pakistan already have land nuclear power plants. We have mastered a lot of nuclear power plants' technologies. After miniaturization, we can be stuffed into nuclear submarines, which has nothing to do with you."

China owes Pakistan too much, especially this time, Pakistan took the initiative to help China recover the island, which is a strategic friend.

Even if Pakistan has nuclear submarines, it will not pose a threat to China. Pakistan and China will be a win-win outcome. However, if China really exports the technology of nuclear submarines, it will make the West dissatisfied. Therefore, it is claimed that the relationship between China must be left out.

"We in Pakistan can start manufacturing nuclear submarines in our own factories. We have now developed new steel with a yield of about 850mpa. Using this steel to build nuclear submarines can reach a submarine depth of at least 400 meters." Haziz continued.
Chapter completed!