An hour and a half later, after interviewing the last interviewee, Lu Yi sighed a little helplessly.

"Can't you do it?" Zhang Qing and Lin Meng, who were next to them, saw Lu Yi shaking his head and asked out loud.

"No, it's enough to be a researcher, but it's still a little bit worse to be a project leader."

The person in charge of the research project is responsible for the research direction of the entire project, and in any scientific research, the direction is the most important.

The scientist potential of this group of people, except for 1 person who is below 85, has reached more than 85, and 4 people have exceeded 90.

But it's a pity that no one exceeds 93, which is a little short of the standard in Lu Yi's heart.

What's more, these 4 people are all men, if they are replaced by cute girls, they can also use systematic theories to guide training and training after cultivating a good feeling, but a man, not to mention the awkwardness in Lu Yi's heart, the exposure coefficient alone is a bit high.

Women will also keep secrets for the object of their affection, men, heh, he himself is a man, don't you know yourself.

Unless he first lets the system announce that he has failed his mission and becomes a beautiful girl, then those men may still keep secrets for her, or they will sell you or use your secret to blackmail for greater benefits.

"Dean Chen, let's go back first, these 9 people will be notified by you later that they will go to Yangcheng to report in 3 days, and I will reimburse the air tickets and fares."

Taking Zhang Qing and Lin Meng out of the conference room, Lu Yi took a list of 9 people to Dean Chen, who was waiting outside, all of them were 9 people with good potential as scientists and relatively good performance during the interview.

"Okay, I'll let them know later."

Dean Chen took the list and glanced at it, and said enthusiastically to Lu Yi: "It's past ten o'clock now, Chief Engineer Lu, you can have a supper and then leave." ”

Some of the doctoral students around who had not left and were waiting for the results of the interview were also looking at Lu Yi with blank eyes, or at the list in Dean Chen's hand, wanting to know if they were among the 9 people.

"No need, go back and eat again." Lu Yi smiled and declined: "I just sent a message from the project side, and I need to go back to deal with urgent problems." ”

"Okay, this time we didn't entertain well, I'll arrange someone to send Chief Engineer Lu to the airport."

Hearing that there was an urgent problem in the project, Dean Chen was not easy to entangle, so he had to apologize and quickly arrange for someone to send Lu Yi and them to the airport.

"Lu Lu, will you go to China Southern Airlines or Xigong Harbin Gong tomorrow? Why don't you take a second look at the rest of Beihang? ”

Several people walked towards the parking lot, Zhang Qing turned her head and asked, she had already roughly guessed that the mentally retarded alien behind Lu Yi should have a unique selection method, so that tomorrow it will take another day, and the remaining more than 200 people in Beihang will be able to read it, saying that they may not be able to find a suitable person in charge of the research project.

"Don't go, let's talk about it when you have time, Rupert is here, I'll take him to the fusion project tomorrow."

Lu Yi shook his head, he wanted to take the time to complete the personnel structure of the space engine project, but since he didn't get it done this time, he could only wait for the nuclear fusion project to be busy.

Otherwise, although it will not affect the construction of the project every day, the impact will not be good, and Rupert will not let him rest if he digs it up, so he must use it well.

"Chief Engineer Lu, Chief Engineer Lu!"

There were still less than 100 meters from the parking lot, and Lu Yi had just finished calling the plane to get ready to return to Yangcheng, when a panting shout came from behind him.

Lu Yi turned around with some confusion, and when the night lights were on, a young man wearing a cheap suit shirt who seemed to have just returned from selling insurance was running this way with a handwritten notebook, and when he was stopped by the security personnel within a range of 5 meters, the system's prompt sound also sounded in his mind.

96.8 of scientist potential? Brother, where did you come from this insurance outfit?

"Let him come." Lu Yi, who was a little surprised, motioned for the security personnel to let him go.

"Chief Engineer Lu ......"

The young man who was only allowed to approach after being searched stood in front of Lu Yi and gasped loudly a few times, and then calmed down and said: "I heard my classmate say that you plan to use the nuclear fusion reactor as the energy core to develop a new generation of space engines. ”

The young man's attitude was very low, and he put the notebook in his hand in front of Lu Yi with both hands, his eyes full of expectation.

"Yes, I'll take a look."

Lu Yi smiled and took the notebook, and asked curiously while flipping through it: "I'm curious, where did you just come from in this dress." ”

"I just got off work after overtime, some time ago I had an accident at home and urgently needed money and dropped out of school, only to find out that I didn't have a degree certificate, and the major I studied didn't have any companies in the society at all, and I went to the Aerospace Research Institute for an interview and people heard that I was dropping out of school and didn't even give the door in."

The young man didn't feel the slightest embarrassment, laughed at himself and shook his head and said: "Then I went to do real estate sales and sell insurance part-time, and barely survived in Shangjing with the school's alumni network, and by the way, I could subsidize my family." ”

"To survive in Beijing and subsidize your family, you are already better than most people."

Lu Yi opened the notebook and read a few pages, his eyebrows couldn't help but pick, and he asked with some interest: "Thermal expansion recoil?" ”

"Yes, the idea is probably that when you were working on the plasma turbulence model last year, we knew that if there was a breakthrough in controlled nuclear fusion, humanity would have the energy and the qualifications to go to the stars.

At that time, I was idle and bored, so I discussed with my roommates how and what kind of technology would be used to get rid of the shackles of the planet at a lower cost if human beings went to the interstellar world. ”

The young man probably recalled: "The current rocket engine will definitely not work, the cost of fuel propellant is too high."

Ion engines are very suitable for use in deep space, but they have the same drawbacks as rocket engines in the field of liftoff, even if they solve the technical problem of small thrust, they also need to consume a lot of propulsion fluid to accelerate the speed to escape speed into space.

At that time, we envisioned a space elevator, building a space port in geosynchronous orbit, and using the space elevator to transport materials and people on the ground and in space, and the spacecraft would not land on the ground, but would dock on the space port.

In this way, it is easier and faster for matter and humans to leave the planet and enter space at a lower cost.

However, after roughly calculating the cost and resources required to build such a space elevator, even if all the technical problems are solved, even if there is controlled nuclear fusion technology, and human beings do not devote the power of the entire civilization to spend decades of effort, this space elevator will not be possible to be built.

On the premise that human beings do not encounter a crisis or the existing system is not changed, they will not devote all the power of civilization to build such a project, and it would be good to allocate three points of resources to this project.

Therefore, the real time of this space elevator is at least 120 years, and it is conservatively estimated that it will take more than 140 years to talk about construction if a series of technical problems are solved. ”

"So you think 140 years is too long to have this idea? It is a very good innovative idea to use the effect of the ultra-high temperature of the exhaust gas produced by nuclear fusion on the material with a high coefficient of thermal expansion, and to use the expansion pressure of the substance to accelerate it. ”

Lu Yi's eyes brightened the more he looked at it, and then handed the notebook to Lin Meng to check, asking her to roughly verify whether the structural data and data model above were correct.

"I also came up with this idea based on the working principle of the rocket engine and the characteristics of the nuclear fusion reactor, which is not a completely innovative idea."

The young man who was praised by Lu Yi was a little embarrassed, if his classmates and friends praised him, he could still show off and pretend to be forced, but the person in front of him, even if he was a few years younger than him, still felt a little flattered to be praised.

"99 out of 100 people here in Beihang University understand the principle of rocket engine work, but no one thought of this idea, or thought of it and no one perfected and verified."

The work done by the rocket engine, the pressure generated by the fuel combustion is uneven to provide part of the power, but most of the power is the pressure expansion that occurs when the high-temperature gas generated by the combustion chamber enters the conical or bell-shaped nozzle of the rocket engine, and the expanded pressure acting on the inner wall of the nozzle will be converted into thrust to provide.

This engine design idea still uses the principle of a rocket engine, but instead of using fuel propellant, it uses the ultra-high temperature exhaust gases of a nuclear fusion reactor and a substance with a high expansion coefficient.

The principle of the work of the rocket engine was explained to Lu Ying when Lu Yi took his sister to Beijing to wait for the plane after the New Year, not only Lu Yi knew, Zhang Qing also knew, Lin Meng knew, and more than 99% of the people in Beihang knew it.

But no one thought of combining a nuclear fusion reactor with a high coefficient of expansion of the substance, and perhaps someone thought of it in a flash of inspiration but did not catch it and perfect it.

Everyone stood in place and waited for a few minutes, and when they saw Lin Meng nodding, Lu Yi also smiled, turned his head and said to the young man: "Are you interested in going to Yangcheng to lead the team to conquer this engine?" Flights now. ”

The structural design is probably verified at the data level, which proves that this space engine design idea is feasible.

This means that in the future, the bulky fuel tanks of rocket engines can be abandoned, the huge cost of fuel propellant can be saved, and the cost of using the heat flow generated by nuclear reactors to convert thrust will plummet.

With this engine as the main engine and the ion engine as the auxiliary, it can be said that the power system of the spacecraft is perfect in the overall framework.

"Interested! Interested! ”

Hearing Lu Yi's invitation, the young man was stunned for a moment and nodded excitedly, running back in such a hurry, risking the danger and rashly ramming into Lu Yi's security team, waiting for so long, isn't this the one.

When I chose to study at Beihang University and chose to study aerospace, isn't this the dream?

He doesn't want to run a business for the rest of his life, if he can, he still prefers to be in the laboratory, and prefers to watch the space engines he designed take the country and civilization to the starry sky......