Live broadcast of my blind date with Miss Dai, sister Zhou was arrested

The application results show that the pump-jet propeller used by the nuclear submarine has better acoustic stealth performance than the seven-bladed large-slope propeller.

And now.

Ye Tian suddenly discovered that he had the opportunity to obtain the secret pump-jet propulsion technology in Europe and the United States!

He was completely stunned.

"Husband, what's wrong with you?"

Seeing that Ye Tian was in a daze and didn't speak.

The little sister asked curiously.

"fine."

Ye Tian chuckled, and said lightly: "Don't worry about them, I won't compromise."

What a joke!

What's the use of wanting those feminist favors?

Not without a girlfriend.

[Ding, the host completes the selection and rewards pump jet propulsion technology]

Followed by system prompts.

next moment.

A lot of information appeared in Ye Tian's mind.

Submarine pump jet propulsion is a combined propulsion device composed of annular duct, stator and rotor.

The cross-section of the annular duct is airfoil-shaped, covering the rotor and the stator, and it is the control surface of the internal and external flow fields of the pump-jet propeller.

If it is made of sound-absorbing and vibration-damping materials, it can shield the noise generated by the rotor and the inner flow channel.

In order to delay the cavitation of the rotor blades and reduce the noise of the rotor, a deceleration duct that can reduce the velocity of the rotor flow is usually used.The stator is a set of fixed blades at a certain angle to the incoming flow, which makes the rotor flow pre-rotate or absorbs the rotational energy of the rotor wake, and is used to fix the duct at the same time.

The rotor is a rotating impeller similar to a propeller, which generates thrust through the interaction with the water flow to propel the submarine to the required speed.

Recalling the information in his mind, Ye Tian's face showed a touch of joy.

he knows.

As long as you have a thorough understanding of these materials, you can design more advanced technologies, so that our country's nuclear submarines have a heart that is more cash than foreign countries! .

Chapter 283 My vacation seems to be gone (seeking automatic subscription)

Tell Dai Xiaomei that she wants to conceive something.

Ye Tian returned to his study.

He started writing on paper.

Pumpjet propellers can be divided into two categories according to the forward and backward positions of the rotor and stator.

The stator arranged in front of the rotor is called "pre-stator type".

The stator is arranged behind the rotor, which is called "rear stator type".

Don't underestimate this subtle difference.

There is a lot of knowledge here.

The stator of the "pre-stator type" pump jet propeller can make the water flow flowing into the rotor at the tail of the submarine pre-swirl, play the role of uniform flow, improve the inflow condition of the rotor, thereby improving the propulsion efficiency of the submarine and reducing the propulsion. Noise from the device.

But the propulsion efficiency of the rotor is slightly lower. The "rear stator type" pump jet propeller has a relatively high propulsion efficiency of the rotor because the stator can recover part of the rotational energy in the wake of the rotor, but the noise is slightly higher.

Most submarines use "front stator" pump-jet propellers, while torpedoes use "rear stator" pump-jet propulsion.

The knowledge here is very deep.

If Ye Tian hadn't read the information, he would not have thought that it would be like this.

But have to say.

This way, the effect is really good.

of course.

This is the previous information.

Recent years,

Foreign thruster technology has made great progress.

The technology mastered by our country cannot be called the most advanced in the world.

But that was before.

Just now.

Ye Tian completed the system's god-level selection task.

The thruster technology that appeared in his mind seemed to be much more advanced than the previous information.

thought here.

Ye Tian sighed.

he knows.

This precious holiday of mine is coming to an end again.

Originally, I didn't want to be the first bird.

But the problem is.

This system gives too much.

Under such circumstances, Ye Tian could only reluctantly continue.

but.

After thinking about it, he had an idea.

I don't have to take this technology out now.

You can spend some time at home thinking about it.

People who do scientific research.

This is often the case.

For a project, there are many people who devote themselves to research for several months, or even several years or decades.

As the saying goes, if you don't make a song, you will be a blockbuster.

Many scientists are like this.

Concentrating on research for decades, he became famous all over the world in one fell swoop.

………………

After making a decision.

Ye Tian told Dai Xiaomei that he would do research at home.

She can choose to stay at home with her, or go to Tang Chen Yipin to live broadcast temporarily.

The little girl thought about it.

Ultimately chose the latter.

"I'll go live over there first, and come back to live at night."

Dai Xiaomei said softly to Ye Tian: "Otherwise, I'm afraid it will affect your thinking."

In her opinion, Ye Tian's scientific research is more important than anything else. If there is no need to make up time, Dai Xiaomei would not even plan to broadcast live, so as not to affect Ye Tian.

"also."

Ye Tian nodded, naturally he didn't object.

He understands Little Sister Dai's painstaking efforts.

I am also very pleased that my girlfriend can support my work so much.

To know.

Many women do not understand the lover.

In their view, no matter how hard a man works, he cannot ignore himself.

As for the man's need to earn money to support his family.

They don't care at all.

Fortunately, Miss Dai is not that kind of person.

Send away little girl Dai.

Ye Tian began to study the technology he had obtained.

In fact.

Nowadays, there is actually a consensus on the next step of the development of pump jet propulsion in the world.

First of all.

It is to improve the design technology of the pump-jet propeller.

There are complex interactions among the duct, stator and rotor of a submarine pump jet propulsion.

In addition, the pump-jet propeller works at the tail of the submarine hull, and there is a complex interaction between the propeller and the hull.

The design of ducts, stators and rotors and the best fit among them, the design of the hull shape and the best fit with the pump jet propeller will directly affect the hydrodynamic performance, cavitation performance and noise performance of the pump jet propeller .

In order for the pump-jet propeller to be widely used on nuclear submarines and to achieve significant noise reduction and efficiency enhancement effects, it is necessary to develop and improve the interdisciplinary discipline based on hydrodynamics and hydroacoustics, as well as to optimize the comprehensive performance of the hull and the pump-jet propeller The design method of submarine pump-jet propulsion.

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Another way is to apply new materials and advanced manufacturing technologies.

Complex structure, heavy weight, and high manufacturing cost are the biggest defects of the pump-jet propeller.

It is said that the pump-jet propulsion is not used on the nuclear submarine of a certain country because of this reason.

therefore,

The use of corrosion-resistant, light-weight, vibration- and noise-reducing composite materials and smart materials is also a key research direction for pump-jet propellers.

The pump spray device equipped on the new generation of "smart" class nuclear submarines of the Gentlemen's Navy, due to the use of nickel-aluminum bronze castings cast by precision casting technology, and the use of new composite materials for the conduit, the corrosion resistance life has increased from the original two years to 25 years. The weight has been reduced by eleven tons, and the impact resistance has been greatly improved.

 …

At last.

It is a power device with high power and low shaft speed.

The rotational noise of the pump jet propeller is proportional to the fourth power of the rotational speed.

Therefore, reducing the rotational speed can reduce the linear velocity of the rotating blade and weaken the eddy current intensity generated by the blade.

Therefore, the eddy current noise which is one of the main sound sources of the propeller is reduced, and the propulsion efficiency of the propeller is improved at the same time.

Looking at a large pile of information in front of him.

Ye Tian was silent for a long time.

Although he had been mentally prepared before, he still did not expect that this task would be such a huge project.

The research that I want to complete independently may not be as easy as you.

thought here.

He took a deep breath.

It's not easy and you have to try.

After all, this is his job.

From the very beginning when he entered the scientific research institute, he already knew that doing scientific research is a particularly boring job.

In many cases, you even have to learn to comfort yourself.