Galactic Tech Empire

Chapter 382
Chengdu, Chengfei Group.

J-20 improvement project.

As the person in charge of this project, Yang Dacheng is discussing with a group of researchers from Dongtang Aerospace Group, as well as many people from Yinhe Aerospace Industry Group.

The reason why people with aerospace systems are here is mainly the result of Chengfei Group's brainstorming, and the rocket engine is on the J-20.

"Mr. Yang, we have already fixed the engine you want." Huang Qinxue of Dongtang Aerospace Industry Group handed a document to Yang Dacheng.

"Oh! That's great. We are all ready now and we only owe Dongfeng. Have you brought your engine?" Yang Dacheng asked quickly while flipping through the documents.

Huang Qinxue pointed to the container not far away and said: "I brought it, there are four in total, but the power of the rocket engine is very powerful, can the body of the J-20 withstand it?"

"We have been modified and strengthened. We have used a lot of carbon nanotube composite materials. The empty weight of the aircraft is lighter than before. Now it depends on your engine." Yang Dacheng said.

This is the driving effect of a large-scale system engineering. In fact, some technologies that can be applied to other fields will be born during the development of mass projectors and spacecraft in aerospace systems.

As the aviation system closest to the aerospace system, they are the first to be radiated by technology. The two have many technologies in common.

For example, the hydrogen-oxygen engine that can be reused on the spacecraft, such as the anti-radiation interference technology on the spacecraft, etc., these technologies can be applied to the aircraft.

After Yang Dacheng finished flipping through the documents, he turned around and told his assistant, "Have someone pull the container inside and prepare to install the engine."

"Okay." The assistant hurried to arrange the matter.

"I asked Mr. Yang why he was in such a hurry. It would take at least two or three days to install the engine on the J-20, so why don't you invite me to your cafeteria for dinner?" Huang Qinxue joked, pointing at his watch.

Yang Dacheng saw that the time was already 12:24, and immediately realized: "It was my negligence, so arrange dinner immediately."

"Then I won't be polite." Huang Qinxue said with a smile.

"It's good that you don't dislike the simple food in Chengfei's cafeteria." Yang Dacheng said as he led the way.

Huang Qinxue suddenly remembered something while walking, took out a list from his briefcase and handed it to Yang Dacheng: "But Cengfan belongs to Cengfan, your four engines have to be reimbursed to us."

"Haha, it will be reimbursed for sure." Yang Dacheng accepted the list with a smile.

Although both parties are state-owned enterprises, the brothers have settled accounts clearly. The total cost of the four engines is as high as 6000 million Chinese yuan. Of course, this is the first batch of manufacturing, which includes a large proportion of research and development costs. If it enters the stage of mass production , The cost of one set may be around 200 to 300 million Chinese yuan.

The rocket engine is relatively simple and crude in structure compared to the turbofan engine, and with the various new technologies and materials used in the current spacecraft, it is even simpler and crude.

Yang Dacheng took Huang Qinxue and others to dinner, while the container was pulled into Chengfei's aircraft assembly workshop.

In the huge assembly workshop, many workers and researchers are busy, and a J-20 without an engine is quietly parked in the assembly workshop.

Since it is necessary to modify the hydrogen-oxygen engine, it is not only a matter of replacing the engine system, but also a problem of the fuel system.

The fuel used by domestic hydrogen-oxygen engines is hydrogen solid fuel, while the J-20's fuel tank has a volume of 12.8 cubic meters and can store up to 10 tons of aviation kerosene (the density of aviation kerosene is 0.78 tons per cubic meter).

12.8 cubic meters of hydrogen solid fuel (the density of hydrogen solid fuel is 0.47 tons per cubic meter), it reaches about 6 tons.

一般航空煤油的热值为41840～42890千焦每公斤，宽馏分煤油可达42890～43510千焦每公斤，航空汽油则大于 43090千焦每公斤。

The calorific value of hydrogen solid fuel is 129000 kilojoules per kilogram, which is about three times that of aviation kerosene.

In theory, every kilogram of submetallic hydrogen can provide three times the power. As for why not use the same hydrogen-oxygen solid mixed fuel as the spacecraft.

There are two reasons for this. The first is that the aircraft mainly flies in the troposphere or stratosphere of the atmosphere, and there is oxygen in it; the second is that the use of hydrogen-oxygen solid mixed fuel will reduce the overall calorific value, because hydrogen and oxygen The calorific value of solid mixed fuel is 14300 kJ/kg.

Why the calorific value of the hydrogen-oxygen solid mixed fuel has dropped so sharply is mainly because the proportion of submetallic oxygen has increased, which reduces the proportion of submetallic hydrogen itself as a fuel.

In theory, 10 tons of aviation kerosene can provide 4.3 million kilojoules of heat, while 6 tons of hydrogen solid fuel can provide 7.74 million kilojoules of heat.

That is to say, after switching to a hydrogen-oxygen engine, the cruising range can be increased by 1.8 times under the premise that the engine power and fuel tank remain unchanged.

The maximum range of the J-20 is 5500 kilometers, and the radius range is 2000 kilometers. After switching to a hydrogen-oxygen engine, the maximum range can be increased to 9900 kilometers, and the radius range can be 3800 kilometers.

In addition, there is another advantage that cannot be ignored, that is, the weight becomes lighter. After 10 tons of aviation kerosene becomes 6 tons of hydrogen solid fuel, there will be an additional 4 tons of payload.

"Mr. Zhang, the engine is here." A staff member shouted to Zhang Weiting, the engineer in charge of assembly.

Zhang Weiting immediately put down what he was doing: "Get the engine out."

"Ok."

After a while, two specially-made hydrogen-oxygen engines (the J-20 has twin engines) were gently lifted by a crane and placed on a workbench.

"Add the weight of the two engines to the data to see how much the overall weight is?" Zhang Weiting ordered.

The researcher quickly calculated, and the data was calculated soon.

"Zhang Gong, the overall weight of the empty plane is 15.7 tons."

Zhang Weiting raised his glasses and remembered this data. The original design of the J-20 was 19 tons empty, the maximum fuel load was 10 tons, and the maximum payload was 8 tons.

After the improvement, the J-20 empty aircraft is 15.7 tons, the maximum fuel load is 6 tons, and the maximum payload is 15.3 tons.

However, considering that the pilot's cockpit will be changed to an anti-G liquid tank, the weight may need to be increased by about 1.5 tons.

The final payload will be between 13.5 and 13.8 tons.

This improvement is simply a qualitative change. If the fuel load is increased, the maximum range may be increased to more than 1 kilometers, and the radius range may reach between 4000 and 5000 kilometers.

"Prepare for the installation work immediately." Zhang Weiting ordered.

"Okay." The engineers and workers in the assembly workshop jumped into action.

After Zhang Weiting ordered the engine installation work, he came to the workshop on the other side, which displayed the anti-gavage support warehouse produced by Shanmei Anti-global Maintenance Warehouse Company, and the special anti-gavage maintenance warehouse for aircraft of Chengfei Group, which was specially customized Version.

The reason why the anti-G load life support warehouse is used is mainly because the J-20, which uses a hydrogen-oxygen engine, is very fast, and it is very likely to break through 10 times the speed of sound.

In this case, the overload that the driver needs to bear will be very terrifying, and it may reach as much as twenty or thirty G in an instant.

The anti-G technology of the spacecraft can just solve this problem.

The aircraft exceeds 10 times the speed of sound, and even this speed is faster than most rockets. Obviously, this magic modification of Chengfei Group has brought about a qualitative change in the J-20.

If some systems are modified, it can even be used as an aerospace plane. Of course, due to the existence of the mass projector, the importance of the aerospace plane is no longer great.

After all, no matter how powerful the aerospace aircraft is, it can't compete with the planetary orbital gun on the synchronous orbit.

(End of this chapter)