Developed countries are very strict about the secret management of submarine propellers, and usually, even a photo will not be seen by outsiders, all of their submarines are built in closed docks, either directly from the dock into the water, or the propeller is completely encased, and after the submarine enters the water, it will be dismantled, all just to ensure that the secret of the propeller is not known by other countries as much as possible.

For example, some of the top manufacturing countries, such as Germany and Japan, have the ability to process as many other countries, and even a simple image can allow them to immediately explore the mysteries, even if they can't reach the same level with pictures, but at least they have the ability to get as close as possible.

The two sets of 11-blade large side inclined propellers processed by Dongchen are firmly wrapped in special canvas in the machining center and loaded into special wooden boxes to ensure that they are completely fixed and fully protected in the wooden boxes.

The two top-of-the-line propellers were loaded onto heavy trucks and escorted by three Dongchen C3 off-road vehicles on the night of the second day to Haining, a port city near Zhonghai City, which is home to the country's largest military port and military shipbuilding center.

Zhang Wenhao was also in one of the C3s, these three C3s were purchased by the state from Dongchen Automobile and belonged to the Nanjiang Provincial Armed Police Corps.

Even these SWAT officers don't know what they're involved in escorting and transporting, they're just getting orders. Be sure to send the two large wooden boxes with a width of six meters on the heavy truck and the two people in the car to Haining before dawn.

Zhang Wenhao and Director Liu sat in the back row of C3, and rarely talked along the way, even if they chatted, the content had nothing to do with propellers and nuclear submarines, but both of them knew that when these two propellers arrived in Haining. After being loaded into the new submarine being tested, I am afraid that China's submarine technology will enter a new era.

Jiangcheng is not far from Zhonghai. Even when I arrived in Haining, it only took more than five hours to arrive in Haining. The sky was only a little bright, and as soon as the convoy drove out of the highway, there were four cars waiting at the exit of the highway, the heavy truck was handed over to the soldiers who came to greet them, Officer Liu and Zhang Wenhao boarded another domestic cheetah off-road, and then, all the Nanjiang armed police special police who followed received the order to return immediately.

The soldiers carried Zhang Wenhao and Liu on, and in a port classified as a military restricted area, the car drove into a huge dock, the top area of this dock. It is even much larger than the roof of Yanjing South Station, and inside the roof cover, in addition to various heavy equipment, several ships of various types are parked within the groove of the idiosyncrasies, and at the other end of the recess. It is connected to the seawater, but at this time, the seawater is blocked by a heavy isolation door.

The convoy passed through several construction sites with no lights on, and when the car turned a corner, Zhang Wenhao's attention was completely attracted by what was in front of him.

It was a large, black, monolithic metal object like a droplet. Although it is only bare at the tail end, it seems very abrupt, the overall shape can be called domineering, as a quasi-military fan Zhang Wenhao, has always been very curious and yearning for submarines, this is the most important weapon in the navy in today's world, and its practicality is far greater than that of aircraft carriers.

The convoy stopped in front of the construction site of the submarine, and the engineers who had been waiting for a long time immediately began to unload the two huge wooden boxes on the truck. …,

Yesterday, the leading experts who had returned from Jiangcheng immediately greeted Zhang Wenhao and Secretary Liu, who had just gotten off the car, and one of the chief designers said excitedly: "The participants of the whole project, after learning that we have an eleven-blade large side tilt propeller, are very excited, and they have been waiting for a long time!" ”

Saying that, he introduced to Zhang Wenhao and Secretary Liu: "This is the third-generation strategic nuclear submarine that we are in a test state, the model has not yet been determined, and there is only this one, two propellers, one of which will be applied to this test submarine, and a 094-class submarine, which will enter the port at noon today, and then enter the maintenance dock, where the other propeller will be replaced, and the two submarines will be tested at the same time, and our surface test ships and equipment are also ready, and they can go to sea tonight." ”

Director Liu couldn't help but say excitedly: "I don't know how much these two propellers can optimize the noise of our submarines." ”

The chief designer smiled helplessly and said: "The biggest problem of our submarines is the noise problem, whether it is an attack nuclear submarine or a strategic nuclear submarine, or even a conventional submarine, they all suffer from noise. ”

Saying that, he added: "Our 092, that is, the first generation of strategic nuclear submarines, the underwater noise reaches 165 decibels, 094 is better, about 140, Russia's technology is stronger than ours, their current strategic nuclear submarines can basically reach the standard of 120 decibels, and the Americans' strategic nuclear submarines have the best technology, basically around 100-110 decibels." ”

At this time, one of the big wooden boxes has been carefully opened, a group of top domestic engineers around the big guy to look at the non-stop, but also amazed, the chief designer took the two to go forward, while doing popular science, said: "The ocean has a background noise, generally speaking, the noise of the submarine on the bottom of the sea is less than 90 decibels, basically the same as the background noise of the ocean, so that the submarine itself can be detectable is extremely low, but this standard, even the Americans can not reach it, If anyone can make a submarine with a noise of less than 90 decibels, it is simply against the sky, and there are various theories on the Internet all day long, saying that the noise of submarines in which country or even China has reached 80 decibels, that kind of rumor, we laugh when we hear it, and the noise of submarines in various countries is decibels. It's all top secret, except that the Americans have the ability to occasionally conduct detailed monitoring of submarines around the world, we can only speculate on an approximate value, and those who say that the number of decibels of submarines in other countries is even detailed to single digits, basically can choose to ignore it. ”

Zhang Wenhao nodded thoughtfully, the noise problem of Chinese submarines has always been the biggest constraint on the combat effectiveness of submarines, and experts in American affairs once ridiculed Chinese submarines. It is an exaggerated irony to say that the noise of Chinese submarines in China's coastal waters can be monitored even in Saigon, Vietnam. But it also highlights China's shortcomings in this area.

Immediately, Zhang Wenhao asked: "This new type of submarine, when using a seven-bladed propeller. What is the noise? ”

The chief designer did not keep Zhang Wenhao and Director Liu secret, Officer Liu had enough identity and authority to know these data at any time, and Zhang Wenhao was the person who nodded above and said not to have anything to hide, so he said without hesitation: "This new submarine has made a certain breakthrough in noise reduction, using seven-bladed propellers, the underwater noise is about 130 decibels, of course, I am talking about low speed." ”

Saying that, the chief designer said with a smile: "This advanced eleven-blade large side-inclined propeller has been replaced." If you can reduce noise by 20 decibels, that's a huge leap! ”

Zhang Wenhao is not sure about this, because the noise of the submarine comes from many sources, especially the nuclear-powered aircraft carrier, which is huge. The structure is complex, and the power part is more complex, first the nuclear reactor, then the steam generation system, then the steam turbine, then the transmission system and the propeller. …,

The approximate principle is: Pressurized water nuclear reactor burns nuclear raw materials to produce heat energy, so that the water reaches thousands of degrees of high temperature under high pressure without boiling, and then generates huge steam power through the steam generation system, pushes the steam turbine, drives the propeller, this whole link, not only complex structure, but also the source of noise, even if the current eleven-blade large side inclined propeller has extremely high performance and noise reduction ability, but the noise of other links is still not improved.

At this time, an engineer came over and asked the chief designer: "Mr. Qu, Liu Gong asked you if you want to start the reactor now?" ”

The chief designer looked at the time and said: "It's not even six o'clock yet, wait until eight o'clock to start on time." ”

"Okay." The engineer nodded, and immediately turned away.

The chief designer said to Zhang Wenhao and Secretary Liu: "The start of the reactor takes about 13 hours to start, mainly because to prevent thermal shock, the temperature of the reactor should gradually rise, start the reactor at eight o'clock, and it should be ready at about 9 o'clock in the evening, this time is enough for us to replace the new propeller, and the other 094, entering the port at noon, the reactor will not be closed, directly replaced with a new propeller, to about 12 o'clock in the morning, two ships enter the sea at the same time." ”

The hoisting of the propeller is not a very difficult thing, but it took less than two hours to install, and at eight o'clock in the morning, the reactor on the new submarine was also started on time, Zhang Wenhao and Director Liu were arranged to have a meal in the canteen of the shipyard at noon, and by noon, a 094 nuclear submarine that had just been commissioned entered the port from the surface.

094 has been installed for several years, and it is no longer news for Western countries, Western countries have enough understanding of this type of strategic nuclear submarine, and now, it has rarely bothered to monitor and study this submarine, so 094 has returned to the port normally to replenish the situation, and generously entered the maintenance and supply dock from the water, everything seems to be ordinary, but no one knows that this 094 was immediately replaced with another eleven-blade large side inclined propeller designed and manufactured by Dongchen after entering the port.

Zhang Wenhao is very interested in nuclear submarines, in fact, he now has the world's top nuclear submarines, that is, all the manufacturing technology of the Ohio nuclear submarine, and even the technology of the later generations of Ohio strategic nuclear submarines.

Strategic nuclear submarines are the king of all submarines, and the only task of this kind of submarine is to carry out sea-based strategic nuclear strikes, and its strategic significance and actual combat significance are far more effective than any kind of nuclear weapons.

As far as the current satellite era is concerned, all land-based nuclear missiles are exposed under the enemy's nose, and once war breaks out, all land-based silos and nuclear force bases will be the targets of the enemy's first devastating strike, and this is the importance of preemptive strikes in the nuclear era. Once land-based nuclear weapons are completely blocked or even destroyed, then the country's nuclear counterattack can only come from the sea.

The ocean is magnificent, but it is also mysterious, no matter how powerful the satellite, it cannot conduct all-round monitoring of the ocean, which accounts for more than 71% of the world's area, and the nuclear submarine is a ghost walking in the depths of the ocean. Therefore, it is the most powerful country. It is also the nuclear force that is least vulnerable to destruction and the easiest to retain.

The reason why it is called a strategic nuclear submarine is because its strategic significance is very significant, a strategic nuclear submarine. Carrying dozens or even hundreds of nuclear missiles, cruising in the vast ocean, it is enough to ensure that it sneaks in the deep sea for 90 days without floating, and it is this extraordinary endurance that ensures that once it enters a state of high emergency, the nuclear submarine can immediately hide in the world's oceans before the war, and once the war breaks out, the nuclear submarine can ignore how powerful the blow suffered by the homeland is, in any corner of the world. Deliver a devastating blow to the enemy. …,

With this thing, you have the strength to fight to the death with any country in the world, and it is with this kind of strategic deterrence that your enemies will be jealous, and will ensure peace or control the development of war.

094 nuclear submarines against such a superpower as the United States. It is still difficult to pose a sufficient threat, and if 094 makes great progress, approaching or even surpassing the Ohio class of the United States, then it is tantamount to planting a time bomb next to the pillow of the Americans. Give them enough deterrence.

Even if there is no war, having this kind of deterrence at hand is a powerful weapon for sustaining peace.

At three o'clock in the afternoon, the refitting of 094 was completed, and at nine o'clock in the evening, the reactor of the test nuclear submarine was started, following the underwater test a month ago, it was ready to enter the magnificent sea again.

In order to approach Chapter 324, it is about to enter the towed sonar detection area! ”

The commander-in-chief in charge of the entire test said: "Inform 094, keep course, at the limit speed, enter the field directly, and don't stop!" ”

"Yes!"

Let 094 maintain its maximum speed, basically its limit speed, the standard for testing submarine noise, generally 5-10 knots of low-speed sneaking noise, the submarine in the enemy detection area, it is impossible to move at full speed, because at full speed, the noise will increase geometrically.

However, the commander-in-chief naturally has his intentions in doing so.

About twenty minutes later, one of the staff members in charge of monitoring exclaimed, "094 has reached 27 knots!" ”

"Good guys!"

The commander-in-chief was immediately overjoyed and blurted out: "With a new propeller, the maximum speed has been increased from 25 knots to 27 knots?!" ”

"It's still slowly accelerating!" The monitor said, "It's almost 28 knots!" ”

Everyone was delighted, and the new propeller was replaced without any change in the entire power system, and the maximum speed was increased by nearly three knots, which means that the thrust utilization of the new propeller is higher than that of the previous seven-bladed propeller.

"Verse 28, there's no room for upside."

Even the speed of 28 knots is very gratifying, and at this time, the submarine has entered and rushed out of the detection range of the test ship, and the commander-in-chief blurted out: "What is the noise reading of the detector at the tail of 094?" ”

"220 decibels."

"Hmm." The commander-in-chief said excitedly: "Compared with the previous full speed state, the speed has been increased by three knots, but the noise has dropped by 15 decibels, if the speed of 25 knots is maintained, I think the noise can be reduced by at least 5 decibels, the performance of this new propeller is really powerful!" ”

As he spoke, he ordered again: "Let 094 turn and re-enter the field, this time, enter the field in a low-speed submarine state in wartime!" ”

This time, 094 reduced its speed to 7 knots, and everyone waited for more than ten minutes before the communication personnel spoke: "094 has entered the monitoring range. ”

"Sonar!" The commander-in-chief blurted out: "Activate all detection means and determine the location of 094!" ”

The personnel in charge of sonar detection continued to monitor, but as the minutes and seconds passed, half an hour later, the location of SCP-094 was still not determined.

The sonar detectors were sweating profusely, but except for them, everyone's face was filled with irrepressible ecstasy, and the sonar couldn't find the location of 094 until now, which proves that the secrecy of the current 094 has been greatly improved!

An hour later, the scene, which had been silent, suddenly sounded the excited roar of the communication personnel, saying: "Report! 094 reported that they had already appeared and drove out of the monitoring range! ”

With a bang, the scene suddenly exploded, everyone roared excitedly, and the sonar testers who were helpless before were also so excited that they couldn't help themselves, they knew that they had done their best, but, from 094 to the exit, the whole process, they didn't find a trace of 094! This proves that the silence of the 094 has surpassed their anti-submarine capabilities! Although China's anti-submarine capabilities are a few points inferior to those of the United States, Japan, Russia and Germany, the performance of 094 is enough to make people excited! (Your support is my biggest motivation.) )