Technological power starts with upgrading lenses

Xijing, Xifei Industry.

In the Yun-20 project department, in the huge assembly workshop, nearly a hundred people are working overtime around a Fat Girl.

And this is actually just the final assembly stage. In major parts manufacturing workshops, there are more than ten times as many engineers working overtime to participate in this 'competition'.

The goal proposed by Dong Jun is to complete the entire fuselage manufacturing process including the preliminary design inspection, model wind tunnel testing and actual manufacturing of the Y-20S within two months, that is, before April 18.

Now almost 25 days have passed, and the manufacturing progress of the fuselage is almost one-third complete.

Looking at the Y20S that has begun to take shape, Dong Jun can't help but feel a little proud of his team's efficiency.

In fact, if he wanted to build it as quickly as possible, he could just get the drawings and just ignore it and just modify an already almost completed Y-20.

This can save at least 20 days.

But the pride and self-confidence deep in his bones made him disdain to win this competition through any opportunistic method.

Although he admitted that Kangchi is indeed powerful, the difficulty of building a brand new engine is not at the same level as building an aircraft that already has a relatively mature production line, even if it requires significant improvements.

If this is all about opportunism, then he himself will look down on himself.

Moreover, basic professional ethics also drove him to strictly check and demonstrate the design plan according to the normal aircraft manufacturing process, and create a scale model for wind tunnel testing. After confirming that there were no problems, he started to start from beginning to end. actual manufacturing.

"Looking at the current progress, we may not be able to build it in 60 days at all. I don't know what the situation is like at Kangchi..."

"Who knows about him!"

Every time this topic comes up, Chi Jinliang's expression becomes a little angry.

Originally, they thought that Kang Chi would be like them when he returned and devote himself wholeheartedly to the research and development of engines. What happened?

First, it was reported that Datang Heavy Industry Technology had invested in Hafei and Changhe, and began to carry out drastic reforms and upgrades in the management and production lines of these two companies.

Then they went to Gangcheng, Pingjiang, Dongyang, Modu and other group affiliated companies with great fanfare to inspect the group's subsidiaries. The noise was so loud that even they could hear it.

Finally, are you still willing to accept interviews from the media?

All these actions made Dong Jun and the others feel that Kang Chi had chosen to give up directly because of his self-awareness.

Or you just underestimate them and don't take them seriously...

Either way, it's enough to make them unhappy.

"Ignore him, let's just do our job."

"Well...I heard that not only Mr. Cai pays special attention to this matter, but also Chief Shen and even the Elders Council have asked about it. So if he can't get the engine out by then, he will be embarrassed..."

"Does the Elder Council already know?"

"Who made his bullshit almost reach the sky..."

"..."

While the two were chatting, Pei Hengsheng's secretary suddenly ran over in a hurry and informed them of something.

"March 26th? Soaring Eagle Base?! He built the engine?!"

Dong Jun and Chi Jinliang were stunned after receiving the notice...

——

March 26, Aoying test flight base.

Although it is exactly noon, the weather today is not very good. Although the dust is not so heavy that the plane cannot take off, the yellow sand in the air still makes the sky look a little dark yellow, and the cold wind is also blowing. My face hurts.

Even so, from time to time there are still people who can't help but run out of the hangar, raise their heads and look at the sky in the distance, obviously impatient for what is about to appear.

"Didn't you say you would be there in five minutes? Why haven't you come yet?"

"It's only been two minutes, okay."

"Only two minutes? Why does it feel like ten minutes isn't so long..."

Seeing Dong Jun and Chi Jinliang, who looked nervous and expectant, whispering and looking outside from time to time, Cai Yaobin couldn't help but feel a little funny.

He could completely understand their feelings. On the one hand, if Kang Chi really did it so quickly, they would lose this game, and they would have to shout those shameful words in front of everyone later...

But compared with this shame, as aviation workers, they are looking forward to the emergence of domestic high-thrust engines more than anyone else.

It's quite contradictory anyway.

In fact, Cai Yaobin's complicated mood at this time is not much worse, but he is the leader after all, no matter how anxious he is, he still needs to have the proper demeanor, right?

What's more, the people standing next to him were Chief Shen and Chief Lu who came specially to visit this test run.

If you act recklessly in front of the military bosses and the Ministry of Science and Technology bosses, the impact will be very bad.

While everyone was waiting anxiously, the roar of the engine was finally faintly heard in the sky. After hearing the sound, even Chief Shen and Chief Lu couldn't help but change their expressions slightly.

"coming!"

Li Xiangnan, who once served as a test pilot for Yinhe, also pointed to the sky with excitement.

The two leaders took a few steps outside and followed Li Xiangnan's hand. As expected, they saw a small black dot. As the sound of the engine became louder and louder, under the dark yellow sky, a Yun-20 became larger and larger, and slowly He landed slowly on the runway and slowly slid into the hangar under the guidance of the ground staff.

This is the second time Kang Chi has come to the Aoying Test Flight Base. The last time he came was to test fly the Silver Crane, and he didn't know much about test flights, so he came alone.

But this time it was an engine test run, so Kangchi directly brought the technical team of Datang Heavy Industries.

There are 108 core members of this team, with an average of postdoctoral fellows per capita. This is Kang Chi’s wealth that he has managed to save with great effort over the past few years. Although not everyone is at Yan Hui’s level, the difference is not too big. As long as the If the technology and tasks are broken down, they can basically help Kangchi complete it very efficiently.

If it hadn't been for them, even if Kang Chi had the drawings and technology, many things wouldn't have been possible to create so quickly.

However, only 36 people came to the Aoxiang base this time. They were all elites in mechanical equipment engineering and other fields, and were also involved in the production and manufacturing of the turbofan 30. Kangchi also directly handed over the detailed test plan to them to formulate.

When setting off from Dongyang, when the pilot heard that there were 36 scientific research leaders on his plane, he was really worried. He even couldn't help but ask whether he should call a few more planes and transport them in batches... …

Don't be afraid of anything, just be afraid of ten thousand.

If this is done in one pot, he will be nailed to the pillar of shame for thousands of years!

However, Kangchi knows the Yun 20 very well. Although the performance is slightly inferior to the C17, the stability is absolutely no problem, so I feel it is completely unnecessary...

After the crew opened the front cabin door, Kang Chi couldn't help showing a surprised expression when he saw the two old men leading the flight.

The appearance of Chief Shen, a military boss, was understandable, but Chief Lu also came, which surprised Kang Chi.

Speaking of which, the two of them hadn't seen each other for a while.

Kang Chi smiled and waved to them, then led Yan Hui and others off the plane, and began to say hello to everyone one by one, and briefly introduced Yan Hui and others.

With this introduction, everyone realized that so many outstanding scientific research talents had already gathered under Kangchi's banner without knowing it. Even without Kangchi, they could be regarded as China's top R\u0026D team.

However, there is no such luxury plastic surgery team in China, but none can be found that can produce results as intensively as Kangchi, and each one is heavyweight.

Not to mention domestically, I can’t find one even if I look around the world...

Therefore, everyone was only slightly surprised, and then quickly focused on the ground staff who was opening the fat girl's ass.

As the staff carefully untied the fixing rope, a rectangular container slowly slid out of the cabin through the pulley on the floor, and was steadily caught by a huge trailer.

Everyone immediately followed the trailer and moved to the test workshop. Then after the staff opened the container, they finally saw what the engine looked like.

Why do you look so small?

This was Dong Jun's first feeling after seeing this engine.

The diameter of this engine is only about four meters by visual inspection, which is even smaller than the diameter of the 204-meter-four turbofan currently equipped by Fat Niu. The diameter of the air inlet blades is about 2 meters, and its shape is similar to that of a traditional aircraft engine. There is a clear difference.

It is like a half-open umbrella, with the top facing inward and embedded in the engine.

What design is this?

Dong Jun's heart was suddenly filled with doubts.

Logically speaking, if an engine with a large bypass ratio wants to obtain greater thrust, enlarging the outer bypass of the engine and increasing the air intake is the most direct and effective method.

And judging from the size of the Kangchi engine alone, it doesn't look like it can reach 50 tons of thrust...

Is there anything magical about the blades of this design?

Dong Jun simulated in his mind what was so special about blades of this shape, but after thinking about it, he still felt that not only would it not be able to increase the air intake, but it would also lose a lot of air intake.

And that's not the only thing that makes him strange.

Generally speaking, engine testing is a test of the core engine, but for this Kangchi engine, even the casing is installed.

And the casing of this engine is also very special.

Generally, the casing of an engine is made smooth and flat in order to reduce wind resistance, but the casing of this engine is as if it is wearing striped clothes, as if the strips of material are welded together...

Not enough craftsmanship?

It shouldn’t be. The craftsmanship of the casing is much simpler than that of the core machine. It makes no sense that the engine can’t be built even if the casing is not finished well...

Except for the people from Datang Heavy Industries, everyone who saw this engine for the first time was as puzzled as Dong Jun.

"Mr. Kang, can your engine... really reach 50 tons of thrust?" Someone finally couldn't help but ask, "It seems smaller than the turbofan 20, right?"

Kang Chi looked at Cai Yaobin, who was the first to ask the question, and nodded: "The current diameter of the entire engine is 4.4 meters, which is 0.2 meters smaller than the turbofan 20, but it can definitely produce more than 50 tons of thrust."

"More than 50 tons?"

"The ultimate thrust."

"oh……"

The so-called limit thrust is the limit when the maximum throttle limit is lifted and the engine life is not considered at all.

This is the same as CPU overclocking. Although the maximum main frequency of the CPU may be only 4GHZ, if you directly increase the voltage, you may even be able to overclock to 5-6GHZ. In this extreme overclocking state, although the performance is higher, but The stability has dropped sharply, and the CPU may be burned out at any time.

Even if it is not burned out, its service life will be greatly reduced.

In the ground bench test that year, the maximum thrust of 56.9 tons obtained by the GE90-115B was considered the ultimate thrust. However, in fact, it can be seen from its 115B model parameters that its maximum thrust under normal circumstances is actually 11500IBF, which is converted into KGF is 52.16, which is often referred to as 52 tons of thrust.

Although Kang Chi's expression was full of confidence, the people at the scene were still a little unconvinced. When Yan Hui and the others began to install the engine on the test bench and prepare for the test, Cai Yaobin asked Kang Chi about the engine design. Why such a strange question.

In order to leave the test in suspense, Kang Chi just smiled and said that he would know after the test, which made them feel itchy in their hearts.

The reason why Kang Chi went to the Aoying Test Flight Test Base to test the engine was mainly to use the wind tunnel here. Only with a wind tunnel can the performance of the engine at different speeds be more realistically tested.

If you find an open space at random, the air replenishment speed in front of the engine may not be able to keep up with the engine intake speed, and the measured data will often be much lower.

This is especially true for engines that require supersonic flight.

Therefore, in the modern aviation industry, the wind tunnel is basically a front-end technology for aircraft design and manufacturing. Without a wind tunnel, it is difficult to build a good aircraft. There has always been a saying in the industry that one generation of wind tunnels and one generation of aircraft.

The Wright brothers also conducted wind tunnel simulation tests before flying the world's first airplane. Its power source was a two-cylinder gas engine. With the development of airplanes, axial-flow models that can simulate speeds up to Mach 1.2 appeared. Wind tunnel.

Later, in order to meet the needs of higher-speed aircraft, compression wind tunnels appeared that used compressors to press air into air tanks. This kind of wind tunnel can simulate airflow of up to Mach 5. If a wind tunnel is added downstream of the wind tunnel, The container takes in air and can even simulate Mach 10 airflow.

The wind tunnel at the Soaring Flight Test Base is a wind tunnel that blows up and sucks down. It was more than enough for this test.

However, if Kangchi develops a rotating detonation ramjet engine in the future, it may not be satisfied here.

You have to go to Huairou to find the JF22 shock wave wind tunnel. It can blow winds up to Mach 30 and is currently the strongest wind tunnel on the surface.

Solidly ahead!

With the cooperation of the Soaring Wind Tunnel staff and the Kangchi team, the engine was quickly installed on the test platform, which was already equipped with various test instruments and pipelines.

Different from the previous test engine that was directly fixed on the test bench, this time according to Kangchi's request, they prepared a special test bench in advance. This bench is like a gantry, with the engine suspended upside down. It is closer to the state where the engine is mounted on the wing.

Soon after, Yan Hui, who was wearing light blue work clothes, handed a document to Kang Chi and said: "Mr. Kang, the preparations for the turbofan 30 engine test have been completed and the test can be started at any time."

Kang Chi took the document, signed his name on it and returned it to him, and then said to everyone at the scene: "The official test is about to begin. Please move to the control room."