Technological power starts with upgrading lenses

Seeing Kang Chi surrounded by everyone, Chief Shen just smiled and applauded, and did not step forward to congratulate him again.

At this time, apart from shock and relief, he could not find any words to praise this young man.

When his hands were a little tired, he couldn't help but rub his eyes gently, and found that the corners of his eyes had become a little wet before he knew it...

Originally, I just heard that Kangchi had built a large bypass engine, and I wanted to come over and see it with my own eyes.

Unexpectedly, I accidentally witnessed a new historical record.

If it weren't for Kang Chi, this world record might not have been broken by China in his lifetime...

What he is in trouble now is whether it is necessary to announce this major scientific and technological progress to the world.

For this kind of news that can excite the whole country, it would be best if it could be made public.

This will greatly enhance the national self-confidence and pride of the Chinese people.

At the same time, the advent of this engine also means that China already has the ability to manufacture very large strategic transport aircraft and stealth strategic bombers.

This will greatly enhance China's international status and strategic deterrence.

However, if it is made public, it will be equivalent to missing a trump card. If the table is really overturned, there will be one less means to catch the enemy by surprise.

However, judging from the current situation, the possibility of actually overturning the table is still relatively low, so the effect of enhancing deterrence should be the best.

So instead of being secretive, we should publicize it!

Of course, the timing of publicity is also important.

For most ordinary people who don't understand aviation engines, looking at aviation engines is definitely not as intuitive as looking at airplanes, so things can be slowed down for a while, at least after the Y-20S test flight, and then the publicity effect will be best.

Even if I can hold it back a little longer, I can unleash a bigger move...

Just when Chief Shen's heart had already flown to Yanjing, and he was preparing to report this major scientific research progress to the Elders in person, the heated atmosphere at the scene finally calmed down.

After a brief celebration, Yan Hui and the test team took the lead in entering the test room and began to disassemble the engine on the test bench. This made everyone think that today's first round of testing had ended.

But unexpectedly, after removing the engine, they rotated the test bench 180 degrees and then started to reinstall the engine.

This move immediately confused everyone.

The first round of testing is mainly to test the performance parameters of the engine. Logically speaking, it should have been completed.

Dong Jun couldn't help but asked Kang Chi: "Today's test is not over yet?"

"Well, there's one last test left."

"What test?"

"Thrust reverse test."

"Thrust reverser? Your engine actually has a thrust reverser device!?"

Dong Jun's heart suddenly beat violently, and he almost doubted whether he would die suddenly here today...

Breathing heavily, he slowly shifted his gaze to the real-time view of the test workshop and carefully observed the rear half of the engine.

Due to the large overall weight of large aircraft, braking requires a very large braking force distance, so it is very picky about the airport, and the runway is even slightly shorter.

If the runway is slippery on rainy days, a longer safety distance must be reserved.

As for extreme situations such as icing on the runway, unless the runway is de-iced in advance, it may not be able to stop even for ten kilometers.

Therefore, relying solely on braking means such as spoilers on the wings and landing gear is actually far from enough to meet the braking needs of large aircraft.

At this time, the thrust reverser came into being.

For large aircraft with thrust reversers, the landing taxiing distance can even be shortened from two to three thousand meters to three to four hundred meters, which is shortened by almost ten times.

The old American C17 transport aircraft is able to complete short takeoff and landing on flat dirt roads, deserts and even grasslands because of the large thrust engine equipped with this thrust reverser device.

The most exaggerated thing is that this cargo has also performed fully loaded takeoffs and landings on the Antarctic ice.

When landing on ice, the braking force of the landing gear is almost zero, and braking depends entirely on reverse thrust.

Aircraft from decades ago had this kind of performance. If you say you don’t envy or covet it, you would be lying...

There are currently three main types of thrust reversers:

The first is baffle-shaped reverse thrust. It is designed by designing the shell of the engine nozzle into a movable bucket-shaped baffle. When reverse thrust is needed, the shell is rotated, like hanging a parachute behind the nozzle. , changing the direction of airflow to generate reverse thrust.

This design has a very simple structure and high reliability, but is very heavy and low in efficiency. It is mainly used in turbojet engines and small bypass ratio engines.

The second type is the Ye Shan type thrust reverser. Its principle is to design the engine casing like a side sliding door, which can slide forward and backward to open the side air outlet of the engine.

When reverse thrust is needed, the choke valve is directly used to block the forward jet port of the engine, so that all airflow can only pass through the side outlet and exhaust in a slightly opposite direction to form reverse thrust.

This design structure is relatively complex, but it has good airflow guidance and high braking efficiency. Many large Boeing aircraft are using this technology.

Finally, there is the baffle-type reverse thrust device, which is a combination of the baffle type and the Yeshan type. When reverse thrust is needed, its shell will bloom like a flower with several petals, because the angle of the reverse air flow is relatively large. , so the effect is also the best.

However, it is not only complex in structure, but also has very high sealing requirements for the deflector door, so the technical difficulty has risen to another level.

Through careful observation, Dong Jun quickly determined the reverse thrust type of Kangchi's turbofan 30, which is the baffle type with the most difficulty and the best effect!

This discovery left Dong Jun with no energy to speak, and he didn't know what to say.

This engine is packed with black technology from the inside to the outside, from beginning to end, and almost every corner that can be plugged in!

Simply outrageous!

Dong Jun seriously doubted that its service life could really be 20,000 hours? !

But Dong Jun didn't dare to ask any more questions, let alone say anything.

After all, my face still hurts a little...

Like a dozen previous projects, this turbofan 30 still performed very stably in the reverse thrust test. When the afterburner was turned on with a bypass ratio of 10, its reverse thrust was as high as 300KN. If we design an airplane that also conforms to dynamics at the back, this thing can even directly make the airplane fly upside down...

However, considering that during takeoff and landing, the aircraft needs to maintain a larger gap between the engine and the runway to avoid inhaling sand and gravel, the bypass ratio is usually changed back to 6 in the air. Even if the afterburner is turned on at this time, it The maximum reverse thrust is actually only 220KN.

And considering that not every runway condition is suitable for a thrust reverser, in order to prevent the downward jet of air from blowing debris into the engine, usually only the two upward ones of the four deflection doors can be opened, so under normal conditions In use, its reverse thrust will be controlled at about 120NK.

Even so, this added joy is enough to make everyone who witnessed today's test unable to sleep.

As soon as the first round of testing ended, Chief Shen immediately pulled Kang Chi aside and asked, "When will the second round of testing start?"

"It will continue tomorrow."

"Do you have to host it?"

Kang Chi shook his head: "The second round of testing is mainly various stability and extreme tests, which is more time-consuming and laborious. I plan to leave it to the engineers at the Aoying Base to host it, and we will also leave a few engineers here to cooperate. "

"Yeah, I got it……"

After Chief Shen expressed his understanding, he hurriedly left the control room without even saying hello.

Soon he came to the communication room of Aoying Test Flight Base and found the red phone...

——

Yanjing.

In an antique courtyard house, an old man with gray hair on his temples was sitting on a wooden chair, reading a thick document carefully.

The title of the document is an analysis of the necessity for China to build a large particle collider and a summary of the opinions of authoritative scholars.

The debate on this topic suddenly became intense after the United States restarted the SSC project. I don’t know if the military’s war negligence this time is considered to have shot itself in the foot...

However, this debate has actually never stopped, but this time it has suddenly become more heated because of the SSC incident.

When the old man saw a certain part of the document, his eyes couldn't help but pause for a moment, then went back and read it carefully.

"Dr. Kang actually sided with Academician Yang?"

"Well, I heard that the cause of this incident was that the military asked Dr. Kang to take advantage of Yinhe's opportunity to confuse his opponents."

Chen Qifan, president of the Chinese Academy of Sciences, who was sitting next to the old man, immediately explained,

"He himself has never been involved in the research of high-energy physics, so he also emphasized that this is just his personal perceptual opinion and does not have a high reference value."

The old man nodded, and then said with a gentle smile: "But building a particle collider in space... I guess only he would dare to think about such a thing."

Dean Chen also smiled and said: "Dr. Kang is still young after all. He still has a long way to go in the future. Many things that we dare not think of may come true in their time."

"Um……"

Just when the old man couldn't help but feel great expectations for the future, and at the same time a little regretful, footsteps suddenly came from outside.

The two men immediately raised their heads and saw a man in military uniform walking in with a slight haste led by guards.

The old man immediately smiled and asked: "Director Ji, why is it so windy when you walk at night?"

Director Ji took a deep breath, tried hard to control his inner excitement, and replied: "I just received news from Mr. Shen."

The old man's eyes suddenly flickered.

"Old Shen... he seemed to have gone to the Aoying Test Flight Base yesterday?"

"Yes, the turbofan-30 built by Dr. Kang successfully passed the first round of testing today, and the results...are quite amazing!"

The moment he heard these words, the old man couldn't help but stood up and looked closely at Director Ji: "Is it really true that the thrust has reached 50 tons?"

"Not only is it 50 tons of thrust... they also broke the historical record!"

"Breaking the historical record?"

Director Ji nodded with a complicated expression, then took a deep breath to adjust his mood before continuing: "This is a long story. I have to briefly explain to you some of the cutting-edge technologies Dr. Kang used this time. …”

So after more than ten minutes of explanation by the director of discipline, the old man finally understood roughly what variable duct, variable circulation and thrust reverse technology are.

"With Dr. Kang's engine, our passenger planes, transport planes, bombers, and even fleets will have a stronger heart support in the future."

"If the Y-20 is equipped with a turbofan-30, if the fuselage material is changed from T1000 carbon fiber to T1200, the full-load range is expected to be increased to more than 10,000 kilometers. This is expected to be able to conduct its first test flight next month. And if it is equipped with On a stealth bomber, the longest range may even exceed 20,000 kilometers..."

"Okay! Great!"

After listening to Director Ji's report, the old man immediately paced back and forth several times excitedly.

Transport planes are okay. They can make do if they don't have enough range and carry capacity, but the significance of long-range strategic bombers is completely different.

Although Country M's "B-2" bomber only has a range of 11,000 kilometers and a combat radius of 5-6 thousand kilometers, because Country M has military bases all over the world and its stealth capabilities, it can fly like a ghost. Likewise, they come and go without a trace, threatening any place in the world.

It is like the Sword of Damocles, always hanging over everyone's head.

The most powerful bomber currently known to China is the H-6K. Its maximum range is 8,000 kilometers and its combat radius is 3.5-4K kilometers.

Because it has no stealth performance, it functions more like an air launch platform and range extender for cruise missiles, which can greatly reduce the missile's launch cost, strike range and shorten strike time.

As a general who defends the territory, the H-6K patrols the border and can frighten the surrounding Xiaoxiao. However, if the opponent is an old M, it will be beyond its reach.

Although the H-20 is also under development, without an engine with such powerful comprehensive performance as the Turbofan 30, the combat radius will not be much farther than the H-6K, and it can only be regarded as a medium-range stealth strategic bomber.

If the target is Lao M’s homeland,

What it can do is fly into the middle of the Pacific Ocean, throw out missiles, and then turn around and go home.

One is to throw it directly to the top of your head,

One is to throw it away when it is thousands of kilometers away.

It is obvious whether the difficulty of missile interception or the bomb load is higher or lower.

If China can possess a stealth strategic bomber with a range of 20,000 kilometers, even if it does not have overseas military bases, it will still have the same Sword of Damocles as the old M.

Although we love peace and like to immerse ourselves in farming and develop the economy, if someone dares to invade us, they are capable of directly bombing your hometown!

All those who have evil thoughts about China will have to think twice more about it in the future!

So soon, with the approval of the Presbytery, a series of projects surrounding the Turbofan-30 began to be quickly established or changed direction.

The first is to completely stop the construction of Yun-20 and transform Yun-20S.

At the same time, in addition to the Y-20S prototype used to test the turbofan 30 in order to keep up with the schedule, the subsequent Y-20S will also have its fuselage size redesigned to further increase the cargo hold size of the Y-20S.

The Yun-20 currently in service will also undergo renovation work one after another.

The second is to launch the super large transport aircraft project ‘Y-30’.

The goal is to build the world's largest transport aircraft.

In fact, although the demand for super-large transport aircraft exists, it is not large. Therefore, this project has more of a symbolic significance. Whether it is built for the Chinese people or for people around the world, it has its necessity.

Third, the development of the CJ2000 engine of the COMAC C929 project has been stopped, and the civilian version of the WS-30 will be purchased from Datang Heavy Industry. The civilian version of the WS-30 will be stripped of the two technologies of variable circulation and variable ducting, and will only retain Thrust reverser.

Fourth, the H-20 research and development project was also changed to use the turbofan-30, the fuselage was redesigned, and the number was changed to H-20S.

When Kang Chi heard what Chief Shen said, he couldn't help but be surprised by such a big move.

Although he is very confident in the Turbofan-30, the test has not yet ended. Why do the leaders have so much confidence in him?

"What if the subsequent test fails?"

"Then continue to improve." Chief Shen said nonchalantly, "Your prototype has been built and has passed the first round of testing. The progress is already faster than other aircraft engines, not to mention the first round of data. good."

"If you really encounter a problem, it's okay. You can solve it slowly. We can afford to wait. If you need any support, just say... It really doesn't work. Those technologies that are too cutting-edge can not be used on the WS-30 for now. We can slowly solve it in the future. Let’s go back to it after solving it. This will be faster than the CJ2000, right?”

"Yeah, I got it."

"In addition, we want you to serve as the chief engineer of the 'Y-30' and 'H-20S'... Do you have this intention?"