The military-industrial scientific research system of the academic master

Compared with their predecessors who spent most of their time sailing on the water, modern submarines, especially nuclear submarines, almost never surface to the surface during normal mission procedures.

Therefore, all aspects of performance are also focused on optimizing underwater performance.

If noise and reactor load issues are not considered, the Long March 9 can probably reach a theoretical maximum speed of about 24-25 knots underwater.

But even attack nuclear submarines such as the Seawolf class or the Type 945, which represent the peak level of the late Cold War, are basically equivalent to driving a train underwater if they sprint at maximum speed.

Not to mention that the 09IV itself is not a strategic nuclear submarine known for its speed and quietness.

No vigilant submarine commander would do this.

In fact, even sailing at a relatively safe depth of 210 meters at a speed of 19 knots makes most crews accustomed to crawling at relatively low speeds a little wary.

"Old Han."

Xiao Songhao, the political commissar of the boat, opened the circular rear hatch, ducked into the command cabin, and said to Han Xiangjie:

"I just came back from the turbine department and I feel that the cooling pump is a bit loud. Look...should I reduce the steam pressure in the secondary circuit and raise some of the core control rods to relieve it?"

These words caused Fan Zhaohui, who had just entered the command cabin, to raise his head and cast a strange look.

In the establishment sequence of the people's army, the political commissar is of course one of the chief officers participating in the command. It is by no means an unimportant role that "just lives". However, usually, due to differences in the level of division of labor, the more senior and technical arms are Political commissars are often not as professional in command as military officers.

But this Xiao Songhao's image is completely different.

Relatively speaking, it seems that he also assumes some of the responsibilities of the deputy captain.

That is to say, remind some precautions when necessary.

Han Xiangjie seemed to be aware of the other party's reaction.

He sat up straightly, but did not immediately respond to Xiao Songhao's inquiry. Instead, he first explained to Fan Zhaohui:

"Lao Xiao worked in the engineering department in his early years, and later transferred to political work. He is more familiar with some technical details than me..."

As soon as Xiao Songhao finished speaking, he heard the captain praising himself to outsiders, and he was in a dilemma for a while.

But submarine command is a serious matter after all, so he still waved his hand:

"Don't rush to flatter me. With the noise we are making now, and we will be operating in this sea area for a relatively long time, if there is an ocean-going fishing vessel or destroyer using towed sonar within a few dozen nautical miles, it is possible to capture it. Something unusual."

Seeing that the other party was pursuing this question, Han Xiangjie quickly put away his smile and replied seriously:

"Even if the opponent's destroyer reacts, it should be on the way at high speed. It is impossible to put down the obstructive towed sonar in a unnecessary way... and if you only rely on the hull sonar, it is impossible to hear it too far away."

This is indeed a relatively good reason.

However, Xiao Songhao still frowned:

"But Old Han, caution is the lifeline of a submarine commander. This is what you say all day long..."

Han Xiangjie couldn't help but feel a little embarrassed when someone used his catchphrase to educate him.

But the reason why he made this seemingly risky decision was naturally after careful consideration:

"Except for the fact that the opponent does not use towed sonar, I don't know if you have noticed, Lao Xiao, that there happens to be a relatively complicated ridge and sea hill between us and the approximate position of the opponent's destroyer fleet."

Xiao Songhao nodded, with a bit of confusion on his face:

"This is indeed true from the data, but... what impact will this have? It's impossible for us to dive deep enough to take advantage of the seabed terrain..."

For the Chinese submarine force, which spends most of its time operating within the first island chain, dealing with and utilizing complex undersea terrain is indeed a unique skill.

But even the shallowest location nearby has a water depth of nearly four digits. Except for some verification monsters during the Cold War, it is impossible to withstand such outrageous water pressure.

“I checked the hydrological conditions in this area before setting sail, and noticed that between March and May every year, due to the continuous action of ocean currents, wind fields, eddies and Rossby waves, water that was originally only distributed on the California coast would be The active high-frequency ocean front spreads into the eastern Pacific Ocean.”

"so?"

Xiao Songhao had also realized at this time that the captain, who had always been upright, was now willing to betray him. He must have a solid trump card.

So I also cooperated with the other party's performance.

“According to research results from geo-environmental science, mesoscale ocean phenomena such as seawater internal waves or ocean fronts will cause an additional loss of approximately 20-30dB in sound propagation.”

Han Xiangjie, who received cooperation, showed a satisfied expression and continued:

"In this case, there won't be much risk if our speed is slightly higher. On the contrary, if the delay is too long and the opponent crosses the middle ocean front area, it may cause greater trouble... "

Now, it was Fan Zhaohui's turn to be shocked:

"Old Han, do you still understand this?"

In his impression, even when he was studying at the Naval Academy, the other party was not known for his academic performance.

Now like this, it can be regarded as a three-day separation, and we should look at each other with admiration.

"That's..."

Han Xiangjie had been waiting for this moment for so long:

"In the new era, commanders of the people's army must not only rely on courage to win wars, but also must be good at using their brains..."

Fan Zhaohui also heard at this time that the old man just wanted to show off in front of him. Although he was really happy for the other party in his heart, he still curled his lips calmly and chose to change the topic...

Ichiban

"Let's not talk about this for now... Actually, I have wanted to ask a few hours ago, even if you really reach the target water area, how are you going to search for the target?"

He said and looked towards the right rear side of the enclosure:

"It cannot float, and there is no aviation equipment... Although the UUV has a camera, it is a wire guide after all, and its radius of movement is quite limited. To ensure safety, we can only stay for less than two hours... We can't use active sonar, right? ?”

Active sonar is accurate enough to detect even medium-sized marine life.

The only problem is that any target with passive sonar turned on will find itself half the time, just like radar.

But electromagnetic waves propagate at the speed of light, so it doesn't matter at all, and sound only has a speed of 1.5km/s in water. Half the time advance usually means a time window of minutes, which is no different from committing suicide.

Therefore, active sonar on submarines are all high-frequency models, used for collision avoidance at close range and are not suitable for large-scale searches.

Xiao Songhao, who had been standing behind, obviously knew the answer to this question. He did not continue to listen, but turned around and prepared to leave again:

"I'd better go to the engine and keep an eye on it for a while, and get some food for the comrades..."

This boat is still not in formal service, and most of the people on board have been transferred from older nuclear submarines. Therefore, despite having sufficient sensor data, they are often used to going to various key locations to keep an eye on them. .

After watching the political commissar leave, Han Xiangjie shook his head and explained again:

"Searching such a large sea area with active sonar is no different than trying to kill a mouse. However, we can detonate a small mine at a specific location and use the sound waves generated by the underwater explosion as a search source to allow the submarine to monitor it from a certain distance. Find some relatively large floating objects on the water surface through triangulation... This is actually a trick we learned from the Americans..."

There is no mistake in every song, one post, one content, one 6 one, one book, one book, take a look!

"..."

Fan Zhaohui was so shocked by this slightly crazy idea that he was speechless for a moment.

But if you think about it carefully, it makes sense.

As long as things on the high seas and oceans do not threaten the shipping routes, no one can say anything.

What's more, the opponent's fleet is still more than a hundred nautical miles away, and it is impossible to notice a small explosion.

A sharp knife cuts through the mess with ease.

"All right……"

Fan Zhaohui raised no objection:

"So... when do we start laying mines?"

Han Xiangjie glanced at the other party with a slightly strange look, and then glanced at the submarine clock next to him:

"About...twenty minutes ago."

"???"

Fan Zhaohui almost gasped when he heard this——

Have you finished the work?

"At that time, you were still resting in the cabin, so I didn't bother you specifically..."

Han explained to Jie.

Fan Zhaohui also knew that he was only responsible for the two additional loads in this mission and did not involve the command of the submarine itself, so there was really no reason for others to notify him specifically.

At this time, Han Xiangjie looked at the submarine clock again:

"Lean forward 10 degrees, float to a depth of 90 degrees, turn to direction 340 degrees, and pay attention to the sonar side array!"

As the new order was issued, the command cabin, which had a relatively relaxed atmosphere, suddenly became tense again.

Fan Zhaohui immediately stopped talking and began to run to the side to prepare to separate from the UUV.

With his relationship with Han Xiangjie, of course they could chat in any way, but when it came to combat command, it was better not to disturb the other party casually.

After another 15 minutes of silence, Fan Zhaohui heard a clear voice.

"Dong——"

It was like someone was holding a small hammer and tapping the hull of the boat outside.

Obviously, this is the main sound wave after the mine explosion hitting the submarine.

The reflected sound wave will be relatively slower due to distance.

And the intensity will be much weaker, at least it cannot be heard directly by human ears.

The next half minute or so was like a year for Fan Zhaohui.

After all, the detection results this time will determine whether he can catch something interesting, or whether he can only take some water samples and go back to quarrel with the Americans.

"Captain."

Finally, the long voice of the sonar came:

"After excluding several targets judged to be fish schools, there are still two water surface echoes that are more suspicious. However, because the sound waves generated by mine explosions are relatively rough, the specific shape of the floating objects cannot be determined for the time being..."

Now, before Han Xiangjie could answer, Fan Zhaohui stood up:

"The UUV is ready and can escape by self-propulsion at any time!"