A big country of aerospace with black technology.

Chapter 174 Fourth Generation Fighter, Wind Tunnel Experiment!
"President Song, you guys are progressing very fast!"

Looking at the 80.00% complete fighter plane in front of him, Zhang Xingyang said with some surprise.

"It is mainly due to the design draft you gave us before, which gave us a lot of inspiration."

Song Tianxing smiled and said.

More than a year ago, Zhang Xingyang gave Song Tianxing a draft of the shape design of some of the fourth-generation aircraft.

These drafts contain a variety of different fourth-generation aircraft shape designs for later generations, from the F-22, which Yingjiang has completed the flight test work, to the J-20, which should not appear until ten years later.

There are even some sketches of an integrated aerospace fighter that was supposed to be 50 years away.

However, the fighter jet that can shuttle back and forth between the inside and outside of the atmosphere is no longer an aircraft in the current sense in the strict sense, and should be classified as a manned spacecraft.

In fact, according to the current level of technology, even if Zhang Xingyang gave them all the blueprints, they couldn't make them.

Neither the material level nor the processing level can be reached.

"You finally chose the canard layout."

Looking at this model of a fighter jet that is not much different from the J-20 of later generations, Zhang Xingyang said with some emotion.

The choice of fighter structure depends to a large extent on the current domestic technical reserves.

Because in the process of designing and manufacturing the J-[-], a lot of design experience has been absorbed.

Song Tianxing and the others also took this issue into consideration when designing the domestic fourth-generation machine.

Although at this time, mainstream theories believe that adding canard design will sacrifice the stealth performance of the fighter.

Because it will affect the radar reflection area at the front of the fighter.

Among the technical indicators of the fourth-generation aircraft, stealth performance is a very important item.

This is also the reason why everyone is generally not optimistic about the canard design.

"We have discovered many interesting phenomena from the previous J-[-]S."

As the fighter jet closest to the fourth-generation aircraft index in China at present, the J-[-]S has also adopted many unique designs in terms of stealth performance.

This includes the unique design of the nose and the side strips in the front half.

"After adopting such a design, not only can the radar reflection area be greatly reduced, but also the high-altitude and high-speed performance can be increased."

"Although the Yingjiang people said that 'canard wings are best installed on enemy aircraft', many people think that there are certain problems with canard wings."

"But according to the situation of our other verification aircraft, there is no such problem."

"Under the same conditions, the stealth performance of the two is not much different."

Song Tianxing and his team actually did not just make such a fighter jet model.

In order to be able to determine the differences and pros and cons of the different layouts, they modeled all three very different fighters.

And through testing, such a canard layout design was finally determined.

After conducting several tests, they found that when the canards and the main wings are on the same plane, it is beneficial to stealth processing.

This is mainly determined by the characteristics of the radar. If contemporary fighter jets want to be stealth, the most important thing is to rely on the shape design.

The only way is to make the radar reflective surface of the aircraft in all directions not be at a perpendicular angle to the incoming radar waves, so that the radar waves cannot be reflected in the original direction, but concentrated in a few limited angles.

In this way, in the radar display, the reflection cross section of the aircraft will be much smaller.

This is also an important reason why there are so many ridges and jagged edges on the fourth-generation fuselage.

These special designs allow fighter jets to effectively reduce their own reflection cross section by reflecting radar waves to low-threat secondary directions when facing radar.

"Mr. Song, you have put in a lot of effort to be able to achieve this level."

Zhang Xingyang could imagine how much time and effort they had spent in this year or so to finalize the shape design of the aircraft.

However, in Zhang Xingyang's view, today's stealth fighter jets have reached their limit.

After all, even a small radar cross section can only deceive ground radar and air early warning aircraft.

But judging from the experience of Zhang Xingyang's later generations, in the wars after the 50s, these radar stealth fighter jets had almost nowhere to escape in the eyes of high-resolution reconnaissance satellites in space.

Because they are heavy air superiority fighters, all of them are more than ten meters in size.

In the eyes of the high-scoring satellites that developed rapidly later, their every step was clearly seen.

Especially in local conflicts, due to the restrictions of the space treaty, satellites in space cannot be attacked.

This also resulted in that both sides in the war basically lost the fog of war in the past and could see the movements of both sides in real time.

This also puts extremely high requirements on the attack speed of the army. If it is a little slower, it may attract attacks from hypersonic missiles.

"How is the ground static test going now?"

Zhang Xingyang didn't worry too much about stealth performance, because everyone still doesn't have such a complete space detection system.

By the way, after the 50s, the most advanced space reconnaissance satellite system in the world was located in Longguo, named Haotianjing.

"The static force balance of the new fighter in front of me is very good, and it can keep the center of gravity well balanced"

Song Tianxing was also very excited when he talked about this:
"It's also mostly because of the canards."

Zhang Xingyang can naturally understand what he means. One of the important functions of canards on the plane is to maintain stability.

Especially the problem of sudden drop in stability during transonic speed can be effectively improved after using canards.

And because the canards designed today are all variable canards, the angle of the canards can be adjusted when needed to obtain the desired lift or drag.

It is used to obtain lift faster during takeoff, so as to shorten the takeoff distance originally required by the aircraft, so that the aircraft can perform short takeoff and landing.

In this wartime, it is very beneficial.

In today's wars, airports are the targets of the first wave of attacks, especially airports where military aircraft are stored are the main targets of the enemy's attacks.

Often after receiving the take-off order, the fighter jet must complete the lift-off within a very short time, otherwise it may be destroyed by the enemy on the runway and hangar.

Short take-off and landing not only allows fighter jets to take off faster, but more importantly, it can reduce the interval between fighter jet takeoffs, enabling more fighter jets to take off in a short period of time.

"The most important thing for us now is to complete the wind tunnel blowing of fighter jets."

Speaking of wind tunnels, Song Tianxing looked at Zhang Xingyang, obviously he also knew that Zhang Xingyang was in charge of several hypersonic wind tunnels.

In this regard, we still have to ask Zhang Xingyang to leave enough wind tunnel experiments for their fourth-generation aircraft.

Zhang Xingyang just glanced at Song Tianxing and understood what he was thinking.

However, he has nothing difficult to do about it.

Because of the wind tunnel base group, currently two hypersonic wind tunnels capable of reaching 16 times the speed of sound are mainly used.

The wind tunnel that can only reach five times the speed of sound has not been used for a long time.

And that wind tunnel, in Zhang Xingyang's expectation, was built for a new generation of fighter jets.

"The wind tunnel used for the blowing experiment is not a problem, but there are some things that need to be clarified in advance."

Zhang Xingyang looked away from the fighter jet that was only coated with a layer of stealth coating, not painted with dark gray camouflage, and exuded carbon fiber black.

"Due to some reasons in that place, your scope of activities will be limited."

Zhang Xingyang's words were not particularly clear, but Song Tianxing still understood what he meant.

There should be other high-density projects at the wind tunnel base.

Song Tianxing didn't say much, he just said that he would restrain his subordinates.
-
A row of heavy-duty trucks, covered with tri-color plastic sheets, looked like an ordinary convoy, driving at high speed on the national highway.

The vehicles passing by the side of the convoy would never have imagined that this somewhat rustic-looking convoy was transporting first-class fighter jet models in China and even in the world.

In front of the convoy, two jeeps full of people opened the way.

These are civilian soldiers defending the rear convoy.

Because the long-distance transportation at this time is not as safe as imagined by later generations.

All kinds of highway robbery, even murder and robbery can be seen.

Fortunately, their journey was relatively smooth, and nothing special happened.

When the fighter jet model successfully arrived at the city more than 100 kilometers away from the wind tunnel base, they stopped.

Next, after inspecting their convoy, the people at the base will transport the fighter model that has been disassembled into parts back through the base's convoy.

"Thank you, Comrade Chu."

The middle-aged man in charge of transportation breathed a sigh of relief after contacting Chu Xuan at the base.

Although he was not told what was inside those containers on the car, his superiors told him before departure that the goods were very important and must arrive safely.

"Nothing, these are what we should do."

After a brief communication with the person in charge of the transport team, Chu Xuan completed the handover of procedures.

From then on, these goods were officially transferred to the hands of the wind tunnel base.

After letting everyone in the transport convoy leave, Chu Xuan and the others began to inspect these convoys.

Although knowing that there is a high probability that there is nothing wrong with these containers, everyone still checked all the places that could be checked with extreme caution.

You can't blame Chu Xuan and the others for being so cautious, because just this year something happened that made everyone feel scared.

A herdsman on the grassland ran into the base for some reason.

Fortunately, it was later found out that he was just lost on the grassland, not a spy sent by the enemy.

Although it did not cause any serious consequences, it still raised everyone's vigilance to a higher level.

Fortunately, after the inspection was completed, no monitoring equipment or the like was found.

While Chu Xuan and the others breathed a sigh of relief, they pulled all these containers back to the wind tunnel base overnight.

In the base, Song Tianxing and other technicians who were in charge of testing had already arrived.

However, many of them still have complaints about the security check before entering the base.

The base's entry inspection is very strict. You not only need to pass the metal detector, but you are not allowed to bring any metal.

Everyone who enters needs to strip naked for inspection.

That's what makes it hard for everyone to accept.

Fortunately, Song Tianxing could understand, so after persuading them one by one, everyone's emotions stabilized.

"I'm sorry everyone, these are the regulations in the base, and each of us must abide by them."

Chu Xuan, who is in charge of the daily work and security of the wind tunnel base, transported the container back.

After understanding everyone's emotions, I hurried over and said a few times sorry.

"However, we have brought back your things, you can take a look first."

Although the technicians complained a little before, everyone subconsciously accepted it, especially after the double comfort of Song Tianxing and Chu Xuan.

So when Chu Xuan announced that their fighter jet model had arrived, everyone started working.

Because the fighter jet model is large in size, it is disassembled into several larger parts during transportation, which is convenient for road transportation.

The technicians brought by Song Tianxing are very familiar with the fighter jets they designed and manufactured by themselves.

It took only one day to reassemble the fighter jet.

In the thermal power plant, the black coal is burning, driving the gas turbine to do work, and then output a steady stream of electricity to activate the shock wave device in the wind tunnel.

There is a big difference between the wind tunnel for testing fighter jets and the wind tunnel for testing missiles.

Missile wind tunnels basically use shock wave technology to simulate aerodynamic phenomena at hypersonic speeds by generating shock waves.

The fighter jet wind tunnel mainly relies on compressor blowing for testing, because the speed of fighter jets is not as abnormal as those hypersonic missiles, reaching more than ten times the speed of sound.

At present, the fastest speed of fighter jets in the world does not exceed Mach 71, and neither the SR-25 "Blackbird" nor the MiG-3.5 exceeds the speed of Mach [-].

Such a speed can also be achieved through a high-power compressor.

The fighter jet model in the wind tunnel can still maintain stability in the wind of nearly 1000 meters per second.

This made many technicians shine. Before the wind tunnel experiment, although everyone had enough confidence in the fighter designed by themselves.

But what kind of technical level can be achieved, I still feel uncertain.

Now the fighter model, the performance in the wind tunnel proves that their painstaking efforts for more than a year have not been in vain, the fighter model has indeed shown excellent aerodynamics.

However, Song Tianxing was not complacent about this result, because according to the news from the Aviation Development Institute, their WS-10 thrust had reached its limit.

According to their previous calculations, the maximum speed of a fighter equipped with two WS-10 engines can reach Mach 3.2, and the current speed is still not enough!

　Ask for a monthly pass, ask for a monthly pass! ! !

　　
　
(End of this chapter)