When I am reborn, I just want to be a top student

Many people only know that our country attaches great importance to the development of the aerospace industry, but few people can explain the reasons behind it.

In addition to the fact that the space industry represents the future of mankind, there are also deeper practical factors.

That is the development of the aerospace industry, which can bring me huge economic benefits.

The aerospace industry is actually also for the development of the earth. For every dollar invested in the aerospace field, 7 to 12 dollars will be returned, and the return on investment is as high as 10 times.

This conclusion is not the result of a single expert's fabrication, but is an evaluation conclusion reached by multiple research institutions using different methods and models. It is extremely authoritative.

In my country, there are more than 1000 new materials, 80% of which are developed using aerospace technology. Space technology is being widely used in communications, medical and other industries.

For example, a coin can stand still on the high-speed rail and you can't feel any vibration at all. The reason behind this is the shock absorption system derived from aerospace technology.

Diapers, ear thermometers, microwave ovens, solar panels, memory foam, hair styling mousse, and dehydrated vegetable packets in instant noodles and other derivative products are all manifestations of the application of aerospace technology in life.

The development of the aerospace industry has driven the development and progress of industries such as satellite technology, high-end equipment, new generation information technology, new materials, energy conservation and environmental protection, biomedicine, and food.

What's more, the aerospace industry represents the future.

What is the basis of human survival?
It is an available resource!
Resources are objective existences and are subject to spatial scale and limitations. Due to the laws of conservation of energy and matter, the resources within any limited space are certain and their exploitable value is also limited.

'Availability' depends on our technical capabilities, demand direction and resource abundance.

Just like the natives of Black Continent, they would not think about exploring the universe and the stars, not only because they have no need, but also because they do not have the strength, and need comes before strength.

Their first goal is to have enough food and fill their stomachs. Only when they are full can they pursue higher goals.

Technological capabilities are the basis for realizing demand. If the country does not have strong industrial manufacturing capabilities, there will be no development of the aerospace industry at all.

The development of aerospace technology expands the boundaries of human cognition, helps us understand the objective world and physical laws outside the earth, explores new resources, new energy, and new environment in the vast universe, and can provide a large amount of resources to solve the contradictions in the development of human society.

It is no exaggeration to say that the development of aerospace technology will bring opportunities and rights for survival. Whoever discovers first, whoever gains the advantage first, and whoever mines first will own the resources. This is an incomparably correct principle throughout the universe.

Major countries around the world are developing aerospace technology partly for this reason.

The ultimate goal of our development of space exploration is to have this priority. As human beings rush down the road of death and develop all kinds of horrific weapons, the earth's environment is becoming more and more fragile.

Throughout human history, war has been everywhere. In modern warfare, as long as you gain air superiority, you can basically control the situation, and space is an indispensable strategic node.

At the same time, the development of the aerospace industry can also greatly inspire national pride and self-confidence.

It can be said that apart from the disadvantage of burning money, the aerospace industry has all advantages.

The reason why Wang Donglai chose to develop aerospace technology was actually based on this consideration.

The reason why I did not plan to follow the official route and chose to start my own company was the reason mentioned before.

Through commercial means, control, reduce and eliminate problems such as the gap between the rich and the poor.

State Key Laboratory of Aerodynamics.

As the director of the laboratory, Deng Gang is naturally qualified to invite Wang Dong to be a guest here.

After all, Wang Donglai has passed the academician assessment, and his status and position have undergone a qualitative change.

Some units and laboratories that are not involved in the core are naturally eligible to enter.

What's more, the invitation was personally received from the laboratory director Deng Gang.

"Academician Deng, what do you think of Bald Eagle's SpaceX?"

Wang Donglai took the initiative to ask.

Deng Gang glanced at Wang Donglai and replied, "To be honest, I'm not optimistic about the development of this company."

"If I remember correctly, the founder of this company was planning to develop reusable rocket technology, but the company inherited technology from NASA, and as a businessman, it is natural to think about saving costs and creating greater profits."

"In this way, the cost is reduced, which is immediately reflected in the safety performance. Many of its launches have exploded, which is the biggest proof of this."

"Of course, we cannot deny the positive significance of SpaceX."

"Bald Eagle's bold advancement in commercial spaceflight, coupled with its deep and complete aerospace industry foundation, is worthy of our learning."

"From this perspective, the Galaxy Technology founded by you, Academician Wang, has also filled a gap in China."

Deng Gang's words were very tactful, but Wang Donglai could tell that Deng Gang was not optimistic about SpaceX or his own entrepreneurial venture in civilian rockets.

"Academician Deng, although SpaceX has failed several times, I think it is a very promising development direction. Every launch of a space rocket is a huge cost, not counting the investment in talent, but just the investment in funds."

"Reuse can save costs. Although safety cannot be guaranteed, it can force technological progress and is a very promising development path."

Hearing Wang Donglai's words, Deng Gang smiled and said, "Academician Wang, our national conditions are different from those of the Bald Eagle. They can vigorously develop commercial aerospace, disregard safety, and conduct radical test flights, but there is no such soil in China."

"In terms of cost, our rocket launch costs are also very high, but compared with the bald eagle, it is nothing. We value safety more. We would rather be steady and slow, but we must ensure that all the technology is fully mastered and safety is guaranteed."

"The recycling plan is nothing. We can do it in China, but it's just a small path. We still have a lot of technological breakthroughs to make in the aerospace field. Now is not the time to pursue these things."

As the director of the National Dynamics Laboratory, Deng Gang naturally has access to a lot of confidential information.

At this moment, seeing what Wang Donglai revealed, he couldn't help but give a reminder.

The reason why Wang Donglai brought up this topic to Deng Gang was not to get any support from Deng Gang, but just to use Deng Gang to express his own ideas.

Later on, when Galaxy Technology achieves a breakthrough in commercial rocket technology, it won’t be so surprising.

Being half a step ahead is a genius, being one step ahead is a monster.

"What Academician Deng said makes sense, but Galaxy Technology's revenue is pretty good, and it can still support my idea for the time being. It would be a pity if I don't give it a try."

Wang Donglai said to Deng Gang with a smile.

Deng Gang nodded in realization and said, "Indeed, sometimes I subconsciously forget that you are the founder of Galaxy Technology, and you don't need this little bit of research and development funding."

"Hearing you say that, I really envy you for being able to conduct academic research according to your own wishes without having to worry about not being able to apply for academic funding or approval issues."

"Our country has a long history and has a lot of lessons to learn in modern times. We have been making up for them over the years. Scientific research funding is budgeted, so in many areas, we have to be prudent and cautious due to lack of money. We have to seek stability and would rather go slow than take risks."

"What's more, we are already in a catching-up position. If we fail, it will have a big impact on the country, so we can't afford to fail easily."

"You don't have the restrictions of scientific research funding, nor do you have to bear the pressure of bearing the expectations of the people, so you can be more radical!"

Wang Donglai nodded and said, "That's true. I think the country's decision to open up private capital to the aerospace sector was probably based on this consideration."

"Besides, Galaxy Technology has made so much money in China. If we just want to put it in the bank, it would be a waste. It would be better to use it to do some scientific research and technological exploration that benefits the country and the people."

"But Academician Wang, I still want to remind you that the development of technology is always a step-by-step process. Don't rush for quick success, especially in such a high-tech field. It's a good idea to do more preparation."

Deng Gang had a good impression of Wang Donglai, so he reminded him again.

"Thank you Academician Deng for the reminder. I will do that!" Wang Donglai said sincerely.

soon.

The two went to Deng Gang's office and talked about the core of the rocket.

Rocket engine!
The liquid oxygen-kerosene rocket engine with the largest single-nozzle thrust in the world is the F-1 liquid oxygen-kerosene rocket engine developed by Bald Eagle. It weighs 8.4 tons, has a sea level thrust of 683 tons, a thrust-to-weight ratio of about 81, and a sea level specific impulse of about 263 seconds. It is the first-stage engine of the Bald Eagle's Saturn V lunar rocket.

The Russian bear's RD series liquid oxygen-kerosene engines can have a single engine thrust of about four to five hundred tons. If it is further modified, it can reach seven to eight hundred tons, which is extremely powerful.

The key point is that this engine was mass-produced by the Russians in the 1980s.

The bald eagle is so proud that it needs to buy this engine from the Russian bear.

But the Russian bear is unwilling to sell to us.

In terms of liquid oxygen-kerosene engines, the gap between us and the Russian bear has always existed, even before Wang Donglai was reborn, we still hadn't caught up.

Deng Gang is now the director of the National Laboratory of Aerodynamics. Although his work is not about developing rocket engines, it is also extremely important.

For example, Academician Deng Gang proposed a new micro-compressible model for the first time in the world, laying the foundation for accurate and efficient numerical simulation of various Mach number flows.

A new method for numerical solution of low-speed flow is also proposed, and experiments show that the method for numerical solution of low-speed flow is successful.

The published paper "Two New Numerical Calculation Methods for Mach Number Flows" caused a huge response internationally, and successfully realized parallel computing on supercomputers. It also corrected some problems in the configuration parameters of supercomputers and made outstanding contributions to the performance testing of the Galaxy super-parallel computer and its successful passing of the national appraisal.

Another impressive achievement is that in order to solve the flight density, flow field and other related data problems of the return capsule when returning to the atmosphere, we proposed the construction of the NND calculation format, which solved the technical parameters of the flight of a series of aircraft such as the spacecraft return capsule under various complex conditions, and won the first prize of National Defense Science and Technology Progress.

To be able to achieve such results, Academician Deng Gang’s attainments in rocket engines cannot be low.

"Our domestic research and development of rocket engines is not satisfactory. Although it is already very good, it is still a long way from the international advanced level."

"The Russians mass-produced the RD series of liquid oxygen-kerosene engines in the last century, but now we are still developing 200-ton engines."

"Not to mention solid rocket engines and liquid-fuel rocket engines."

"Academician Wang, if you want to develop rockets, rocket engines are essential, so which rocket engine do you plan to use, Academician Wang?"

Deng Gang asked with some curiosity.

The Russian bear would rather sell its rocket engines to the bald eagle than to its own country.

As for the Bald Eagle, they have long introduced the Wolf Amendment to restrict domestic aerospace development, making it even more impossible for them to sell their rocket engines.

Therefore, the only channel Wang Donglai can purchase is the domestic one.

Advanced products are confidential and cannot be sold at all.

The outdated products cannot meet the requirements.

Therefore, Deng Gang was not optimistic about Wang Donglai's choice at all.

A high-tech field like space rockets is simply not something a private company can handle.

When Wang Donglai heard Deng Gang ask this, a confident smile appeared on his face.

"I like to challenge difficult things. Since we are lagging behind the international level in rocket engines, I want to try to see if I can solve this problem."

Deng Gang’s first reaction was that he had heard it wrong.

Deng Gang scratched his ears and asked in surprise, "Academician Wang, are you serious?"

"Of course I'm serious!"

After hearing Wang Donglai's serious and firm answer, Deng Gang looked at Wang Donglai seriously again.

After thinking about it, he started searching on his desk.

Soon, he took out a document and said to Wang Dong: "Academician Wang, this is a project that was just submitted this morning and needs help from our laboratory. It is about the flight mechanics of hypersonic aircraft."

"When the aircraft was flying at low speed, the test flight indicated that the terminal rolling maneuverability was insufficient. The only solution was to enlarge the ailerons, but for an aircraft that had already been designed, this solution was obviously unacceptable, so they found us."

"Academician Wang, you might as well take a look at this issue."

As Deng Gang spoke, he pushed the document in front of Wang Donglai.

The meaning is very clear. They want to test Wang Donglai's true level and make Wang Donglai give up the idea of ​​developing his own rocket engine.

However, Wang Donglai took the document with confidence and quickly checked it.

Wang Donglai knew Deng Gang's thoughts very well, but he was not angry at all.

Relying on his speed reading ability, Wang Donglai quickly finished reading all the documents in just ten minutes.

After reading it, Wang Donglai just closed his eyes and thought for less than a minute. Then he opened his eyes and said with a smile: "Academician Deng, this question is too simple."

"It is likely that the yaw moment caused by the roll angular rate offsets a large part of the efficiency of the aileron. The principle is that the aileron causes the roll rate, and the cross derivative of the roll rate and the yaw moment causes a yaw moment, which causes sideslip and finally causes rolling. However, the direction of this roll is opposite to the desired direction, so the aileron is not easy to use."

Deng Gang blinked, a look of obvious shock appearing on his face.

He was very sure that Wang Donglai had absolutely no way of knowing about this before.

You know, even he only got the document this morning.

It contains a complete set of flight control data tables, derivative tables and other confidential data, which will not be leaked easily.

As for Wang Donglai's answer, Deng Gang naturally knew that it was correct.

However, Deng Gang did not show it, but continued to ask: "Then does Academician Wang have any solution?"

Wang Donglai said confidently: "It's very simple. Add rudder feedforward control and give rudder commands at the same time as the aileron control commands to offset the yaw moment caused by the roll angular rate."

Deng Gang looked at Wang Donglai's confident and youthful face and let out a long breath.

"Heroes emerge young. This saying is indeed true."

"It only took about ten minutes. After you finished reading the document, it took you less than a minute to find the problem and provide a solution."

"If I hadn't seen it with my own eyes, I wouldn't have believed it was true."

"I suddenly have confidence in your development of rocket engines. Maybe you can really succeed!"

Wang Dong said with a confident smile: "It will definitely be a success!"

The words were sonorous and powerful, and they landed with a resounding sound. (End of this chapter)