In the small building, Pleshakov was very excited when he saw a group of people coming in. He almost ran towards the crowd in a few steps, and then grabbed the hand of one of them.

"Mr. Qin, the appearance plan you gave is really great! Through simple modification design, our radar reflection cross section has been reduced by an order of magnitude!" Pleshakov was excited, this is definitely a

What a miracle!

As for radar reflectivity, it was a calculation formula developed by one of Lao Maozi's professors, but it was not taken seriously by Lao Maozi. Instead, it traveled across the ocean and was regarded as a classic in Skunk Works.

Therefore, Pleshakov and the others simply did not know how to make the aircraft have stealth performance. Qin Tao gave them specific ideas and guided them to improve. In recent times, they have been working hard in this area.

After all, the shape of the aircraft must be determined first.

With capital investment, a professional electromagnetic laboratory was also established. Following Qin Tao's suggestion, they made relevant models and put them in for testing. The results were incredible to them!

"By the way, Lao Mao, I heard that in the Red Empire era, instead of physical invisibility, what kind of plasma invisibility technology was used? Have you ever been exposed to this technology?" Pu looked at the excited face in front of him.

Leshakov, Qin Tao asked immediately.

Plasma is the fourth state of matter formed by gas ionization. It is an ionized gas that is generally electrically neutral and composed of positive ions, free electrons and neutral atoms. It is said that in the 1960s, Lao Maozi and Americans began to

These studies have been carried out, and some research results have also appeared. For example, electromagnetic waves and plasma interact.

When the plasma frequency is greater than the frequency of the incident electromagnetic wave, it will block the entry of electromagnetic waves. It can only enter 2 millimeters at most, and 80 to 90 percent of the energy will be reflected away.

However, if the value is reversed, the electromagnetic wave will enter the plasma and propagate in it. During the propagation process, part of the energy of the electromagnetic wave is transmitted to the charged particles in the plasma, and is absorbed by the charged particles, while its own energy

Gradually attenuate, which means that the electromagnetic wave is absorbed by the plasma!

Using this principle, the aircraft can be made invisible. When the opposite radar emits electromagnetic waves, a layer of plasma is gathered on the surface of the aircraft, so that all those electromagnetic waves are absorbed and cannot be reflected back, making it impossible to detect.

If you were to use images to describe it, it would probably be the same as the energy shield in science fiction.

It's just that theory is one thing, but turning it into practice is another thing. During the Cold War, Lao Maozi did come up with a lot of black technology. At the same time, the MiG 1.44 under development did not consider stealth performance.

In other words, Lao Maozi pinned all his hopes on this plasma stealth technology.

What are the facts?

Now I am taking this opportunity to ask Pleshakov. Although the Yakovlev Design Bureau has been marginalized, they should know something.

"This thing was indeed studied during the Red Empire era." Pleshakov said: "This project is mainly carried out by the Skrdesh Research Center."

"Plasma invisibility?" Everyone present became curious. This sounds very high-end!

"Is there really such a technology?"

"It's just that the engineering application of this technology is still very far away." Pleshakov said: "They have encountered many difficulties. For example, if they want to absorb electromagnetic waves, they have to control the frequency of the plasma. This

Frequency is related to many factors, especially external conditions. If it is not done correctly, it will not absorb electromagnetic waves, but completely reflect electromagnetic waves."

I originally wanted to be invisible, but what happened? It suddenly became clearer. This result is unbearable.

"Also, this plasma generator is not easy to make. How to generate plasma is a difficult problem. According to our estimation, it will take at least ten or even twenty years before it can be truly used in engineering applications."

It is indeed being done, but it is still early to mature. This thing, like laser weapons, is elusive.

Qin Tao nodded, finally understanding.

Although Da Mao boasted about plasma stealth technology many times in the next ten or twenty years, in the end, Da Mao still honestly went to work on the T-50, changing its appearance to make it invisible, and completely gave up on this tall

In other words, until the end, this stealth technology did not mature.

"In contrast, now we can achieve such a good stealth effect just by modifying the appearance, which is really rare." Pleshakov continued to bring the topic back: "This kind of stealth design does not

It does not reduce the flight performance of the aircraft and is relatively stable. It is the best choice, but... there is still a big gap between it and the American F-117."

The radar reflection area of ​​the F-117 is said to have been reduced to 0.001 square meters, while our own aircraft can only be reduced to 0.5. The gap is huge!

"At present, this is already a great progress." Qin Tao said: "For a combat aircraft, it is unreliable to maintain complete stealth unless it does not use radar and only launches attacks on the enemy.

Before the attack, it is enough not to be discovered by the enemy. Specifically, it is enough to prevent the enemy from being discovered dozens of kilometers away. In the future, when our absorbing coating technology matures, we will absorb some radar waves, so that

The RCS can continue to be reduced by an order of magnitude.”

Stealth aircraft are indeed high-end, but unless they are guided by an early warning aircraft and operate silently throughout the whole process, their own radar will always be turned on when launching missiles to attack the enemy.

This chapter is not over yet, please click on the next page to continue reading! The target will be exposed when you turn on the computer, so stealth is unnecessary.

Therefore, reducing the radar reflection area by one order of magnitude is enough for Qin Tao.

After all, the invisibility of the appearance is on the one hand, and on the other hand, it still depends on the absorbing coating. As for this thing, it requires the efforts of relevant departments, and Qin Tao cannot participate.

In the electromagnetic laboratory, there is a one-to-ten scale model, which is close to two meters. It looks very realistic. When Mr. Lin saw this model, he couldn't help but sigh.

"This look is so sci-fi that it could only appear in movies. When I saw the prototype of Project 10, I was amazed. But now, compared with today's surprise, it is nothing to mention."

Mr. Lin's words were somewhat disparaging to Jian Shi, but Mr. Song didn't think there was anything wrong. Mr. Lin was an open and honest person, and he said what he said without hiding anything.

In public, Mr. Lin has supported the J-10 more than once, because he knows that the J-10 is of great significance to the Air Force. Now, Mr. Lin is extremely shocked when he sees this model, more than the J-10. That is normal.

.

The J-10 is very beautiful, but it is still conventional after all. However, the model in front of you is definitely unconventional.

The rhombus-shaped nose, parallelogram air inlet, wide fuselage, butterfly-shaped wings, and inclined twin vertical tails all look completely different from today's fighter aircraft. They are simply from two eras.

If we make a comparison, it's like the gap between the Su-27 and the MiG-21.

"The stealth technology tested on this aircraft will be a great inspiration for our future development of new fighter jets." Mr. Song said from the side: "Many design elements will be inherited and carried forward by us. Mr. Qin is still very good.

The designs that came out are quite good.”

Qin Tao quickly waved his hand: "I'm just saying casually, you have to go through a lot of complicated calculations before you are the real experts."

It's just an appearance and a few words, but if it really wants to be effective, it must go through engineering calculations. The proportional model in front of you was only made after complex calculations.

of.

Qin Tao cannot take credit.

"Lao Wu, your navy is really powerful. It has developed such an advanced aircraft. When our air force has more money in the future, we can also support you!"

Mr. Lin was very happy and seemed to see the great prospects of the motherland's aviation force.

The heavy-duty Su-27 and the medium-sized J-10 have become the backbone of the aviation force, and the stealth aircraft in front of you is completely designed to meet the needs of the next twenty or even thirty years! The technology used on it is better than that of today's aircraft

Be a generation ahead!

"Just talk and don't practice fake tricks, but you are investing. If the J-H-7 didn't have the funds of our navy, it would have been ruined long ago."

Just when they were old friends falling in love and killing each other, Qin Tao had already circled the aircraft model, and he was very satisfied in his heart. This is a real F-35!

Let's work this out and see if Lockheed can successfully bid for it? It would be fun if the United States chose the big-mouthed X-32.

Wait, something seems wrong?

Qin Tao stood next to the air intake, thought carefully, and then thought of something.

"The plate at the air inlet will affect the stealth effect. You can remove this plate."

Following Qin Tao's hand, Mr. Song looked slightly embarrassed.

"Mr. Qin, you probably don't know that this board is called a boundary layer partition. All supersonic aircraft have this partition to eliminate the airflow on the surface of the fuselage."

Mr. Qin is very powerful, but when it comes to professional content, he is not so proficient.

When an aircraft moves at high speed, the air flowing over the surface of the fuselage will produce a boundary layer effect, that is, the thin layer of air close to the surface of the fuselage is blocked and the flow speed slows down. By analogy, it is similar to a river. The water on the riverside

The flow speed will be lower than the flow speed in the middle of the river. (The Hero of East China remembers that when I was in college, this seemed to be called the Bernoulli effect. I don’t know if that’s right.)

In this way, if the air intake is directly adjacent to the fuselage, the amount of air entering will be reduced under the same area, and it will not be uniform, which can easily cause the engine to surge.

Therefore, except for fighters with nose air intakes, other fighters have designed this kind of special isolation plate on the air intake duct to maintain a certain gap between the air intake duct and the fuselage to prevent boundary layer airflow from entering the engine.

On the J-10 fighter jets tested outside, this isolation panel is hung up by a stick above the air inlet.

Qin Tao smiled: "I know, I was just wondering if we could design a non-adjustable convex curved surface near the air inlet, so as to create a difference in pressure distribution at the air inlet and make the boundary layer

The airflow is blown away before entering the inlet duct and does not enter the inlet duct, thereby keeping the airflow evenly entering the compressor.”

What Qin Tao is talking about is the famous clam inlet in later generations, or bulging inlet. This design has many advantages. It can reduce weight, block the air inlet, and reduce the radar reflection area. Therefore, we get

a wide range of applications.

However, to a layman, it looks like just a bag. In fact, the shape of this bag is very important. If it is slightly inappropriate, it will have a great impact on the flow field characteristics of the inlet and the performance of the engine. It is difficult to design and difficult to manufacture.

Simple, but not so easy to make.

The technicians present all started thinking. After thinking for a while, Pleshakov nodded: "Theoretically, it can be done."

"Well, we can continue to study this. Use this partition first. When the technology matures, it will not be too late to replace it." Qin Tao said: "After all, this is a vertical take-off and landing fighter. We must first complete the basic requirements.

.”

This chapter is not over yet, please click on the next page to continue reading! The entire J-31 project is for the navy. It is necessary to create an advanced vertical take-off and landing fighter for the navy. This is the basic requirement. Everything else is required.

It can be placed in a secondary position.

"If the vertical take-off and landing fighter can be successfully developed, our Air Force will also have demand." Mr. Lin said: "However, it must be mature, and it cannot be like the Yak-38."

In fact, by the time this aircraft is developed, Mr. Lin will have retired long ago. What he says now is of no use at all. It can only encourage the technical staff present, especially these old fools, who started from Yakovlev's design.

Those who came from the Air Force have always been in a marginalized position. Now, it is an encouragement to them to be recognized by the Air Force boss.

"Actually, we also know that the Yak-38 has many problems, so we also have various improvement plans." Pleshakov said: "Taking power as an example, we once planned to use the AL-21F engine to modify the Yak-38.
To be continued...