Bao Xiangwen was alone, sitting in the interview room.

The air conditioning is abundant, some cold, and the light overhead is unusually bright, but it is extremely soft and does not feel dazzling.

Large-screen monitors, Moss Ai second-generation speakers, projectors and other equipment are readily available, and there are actually a variety of tea and fruit plates on the table.

"Crunch"!

The glass door was pushed open, and the three interviewers walked straight in.

The young man in the lead, only in his early twenties, is tough and handsome, and wears a well-tailored suit, which makes the figure look more and more muscular and straight.

On the left-hand side is a middle-aged man full of energy, with slightly sunken and thin cheeks, eyes like torches, and a loose casual coat.

Finally, there was a lady, in her thirties, wearing a professional outfit with meticulous lining, and it could be seen that she was an extremely strict person.

"Three, good morning, I'm Bao Xiangwen, the interviewer."

Bao Xiangwen took the initiative to get up and introduced himself.

"You may be seated, you're welcome."

Chen Heyu waved his hand and said.

"I am Wei Guangji, the general manager of Yunkun Space Company, this is the big boss Chen Heyu, and the other is Shi Yijia, the director of the personnel department.

We all have a basic understanding of Mr. Bao's situation, you were a technician at Fengjing Aeronautical Research Institute, mainly responsible for the rocket power system, can you talk about your previous work? ”

Wei Guangji was the first to ask.

Top banana?

Chen Hayu?

Bao Xiangwen was secretly frightened, he had heard that the initial investment of the Yunkun project was 10 billion Chinese dollars, and there would be additional funds of 20 billion Chinese yuan in the future.

He is worthy of being the founder of Future Technology and Shanhai Microelectronics, which is really arrogant!

"Of course, I joined the institute in 2006, obtained the researcher qualification in 2008, and since September 2010, I have been independently responsible for the design and development of cryogenic propulsion engines, and have provided perfect technical solutions in the problem solving of liquid oxygen kerosene high-pressure refueling and liquid oxygen methane engines.

First of all, let's talk about liquid oxygen kerosene high-pressure refueling, which is a core technology to improve the thrust and efficiency of rocket engines.

The specific operation mode refers to the simultaneous injection of liquid oxygen and kerosene in the combustion chamber of the rocket engine, which will produce more combustion products under high pressure and high temperature conditions, and further improve the instantaneous injection speed and thrust.

And, the technology has four advantages:

First, improve the thrust: the refueling technology can increase the mass flow of fuel, improve the energy release of the combustion reaction, and thus improve the thrust of the rocket engine;

Second, improve efficiency: the refueling technology effectively uses additional fuel, improves the energy conversion efficiency of the combustion process, and thus improves the combustion efficiency of the rocket engine;

Third, flexibility: refueling technology allows the rocket engine to adjust the fuel ratio at different stages to meet the needs of different missions;

Fourth, adaptability: liquid oxygen and kerosene are common and easily available fuels, so the high-pressure refueling technology of liquid oxygen kerosene has strong adaptability and operability......"

Bao Xiangwen talked eloquently, when talking about the field he was good at, his eyes were bright and full of confidence, and he couldn't see the original strength at all.

Chen Heyu bowed slightly, he had read so many professional books, it was not in vain, even if there was no systematic prompt sound, he could judge that the other party's ability and talent were definitely good.

Coupled with the sound of "Ding Ding Ding" in his head, he thought a little, and wrote the word "P5" directly in the interview evaluation area.

"As for the liquid oxygen methane engine, it is a rocket engine that uses liquid oxygen (LOX) and methane (CH4) as fuel.

It usually consists of a combustion chamber and a nozzle.

In the combustion chamber, liquid oxygen and methane are mixed and ignited to produce a high-temperature and high-pressure combustion gas, which is then injected through the nozzle to generate thrust.

As far as I know, one of the fuel formulations used by SpaceM, a beautiful space company, uses methane (CH4) and liquid oxygen (LOX) as fuels to power the Raptor engine. ”

Bao Xiangwen paused for a moment and continued to add.

"I want to increase the number of launches of rockets and reduce the cost of launches, from your professional point of view, is there a better proposal?"

Chen Heyu became interested, put aside Wei Guangji, and asked with a smile.

"There are many ways to achieve it theoretically, and if you want to reproduce it perfectly, you need to continue experimenting, but I will first talk about my personal opinion:

Firstly, the mixed cycle combustion technology is adopted, the fuel and oxidizer are burned separately in different combustion chambers, and the high pressure and high temperature generated by the exhaust gas are used to drive the turbine pump.

Secondly, the total cooling cooler technology is improved, and part of the fuel sent by the turbine pump flows through the combustion chamber wall to realize the cooling of the combustion chamber and the nozzle, which can effectively reduce the temperature of the combustion chamber and improve the durability and reliability of the engine.

Thirdly, the engine with multi-ignition is designed to be able to carry out the mission smoothly or return safely even in the event of an ignition failure;

Finally, the structural design was strengthened, using high-strength, lightweight materials and advanced manufacturing processes to meet the challenges posed by multiple launches and recycling. ”

Bao Xiangwen thought for dozens of seconds, sorted out the logical order, and interpreted them one by one.

"I'm sorry, I take the liberty to ask, from your explanation, it can be seen that you have rich experience in rocket engines and fuel proportions, but why can't any of your papers be found in mainstream journals in China?"

Shi Yijia, the director of human resources, asked a sharp question.

This is the duty she must fulfill, although some candidates, in the interview, are full of words, but after the investigation, it is found that the other party has no real material at all.

"I ......"

Bao Xiangwen opened his mouth, hesitating and not knowing how to explain.

"Mr. Bao, is there anything unspeakable?"

After graduating, Wei Guangji went abroad for further study, and has been active in the aviation industry in Europe for many years.

"I don't have enough connections, even if I make scientific research results, I don't have the right to authorship."

Bao Xiangwen replied dryly, vaguely mentioning, with a look of helplessness on his face.

“What？ Is there such a thing? ”

Wei Guangji was shocked, a little incredulous, and turned his head to look at Chen Heyu, as if he wanted to ask for proof.

"Mr. Bao, I can understand, this is an engine design plan, can you see if there are any problems?"

Chen Heyu smiled, ignored Wei Guangji, took out a stack of documents from his hand, and handed them to Bao Xiangwen.

"Okay, guys, wait a minute, I need a little time."

Bao Xiangwen said frankly.

"Please!"

Chen Heyu picked up a pot of lemonade, poured himself a glass, took a sip gently, and waited patiently.

Bao Xiangwen flipped through the information, and the first sheet of A4 paper was printed with a structural diagram of the engine, including the combustion chamber, fuel system, oxidizer system, guidance system and cooling system, as well as turbine pumps, nozzles, valves, and sensors.

In terms of fuel choice, it is the methane (CH4) he just mentioned, although methane has a higher combustion temperature and lower energy density than kerosene, but the advantage is that it can be compounded with liquid oxygen (LOX) to produce a terrifying propulsion between 200 and 250 tons.

In vacuum, it can even reach 300 tons!

"Mr. Chen, this technology is a grade more advanced than the engine design of Fengjing Research Institute.

With my ability, I really don't see anything wrong, if I insist on it, it's just that the room ballast is too high, the value of 30 megapascals, once there is the slightest foreign matter in the fuel, it will ......"

After a long time, Bao Xiangwen read the entire material and raised his head and replied.

"Will it explode? Truly! Aluminum alloy and Kevlar materials can't resist at all, so what solutions do you have? ”

Chen Heyu asked with a smile.

"If you don't take into account the factors of cost and manufacturing difficulty, I have three suggestions:

First, optimize the structural design of the combustion chamber: use pre-cooled liquid oxygen-methane propellant to surround the wall of the combustion chamber so that it can withstand high temperature and high pressure combustion gas;

Through a fine network of pipes, part of the fuel and oxidizer that are not fully burned are directed, flowing along the walls of the combustion chamber, absorbing the heat generated by combustion and cooling it to an acceptable temperature;

Second, efficient heat dissipation: the use of a full cooler to form a thin liquid film on the wall of the combustion chamber to isolate the unburned fuel and oxidant from the high-temperature gas generated by combustion, avoid direct contact, and reduce heat conduction.

The coolant is then circulated in the pipes, and the heat is effectively taken away and dissipated to the outside;

Third, use high-temperature alloys and high-pressure resistant materials to build key components such as combustion chamber walls and turbine pumps to increase their ability to withstand high temperature and high pressure environments; ”

Bao Xiangwen was still not afraid, and he narrated it clearly.

He didn't know that the prototype of the technical document in his hand was SpaceM's Raptor engine.

"Not bad! Look at this material again? ”

Chen Heyu nodded with satisfaction and handed over a document again, which was a new type of engine formed by him on the basis of the Raptor engine and re-improvement.

He named it "Dijiang"!

The estimated parameters are 400 tons (3921 kN) of thrust at sea level, 452 tons (4430 kN) of vacuum thrust, and a combustion chamber pressure of up to 32 MPa.

If put into service, the "Dijiang" will become the second largest liquid rocket engine in service in the world, second only to the RD-171 (7904 kN) of the Tianding rocket.

"Genius design!"

Bao Xiangwen was secretly convinced.

"Autogeneous! Heating methane and liquid oxygen with a heat exchanger allows the fuel in the tank to be pressurized by itself after continuous consumption, which can effectively avoid the explosion caused by helium pressurization. ”

Bao Xiangwen raised his voice, a little happy to see the hunt, and couldn't help asking: "Can I know the name of this designer?" ”

Wei Guangji looked at Chen Heyu with a strange face, this boss of his own family is really an all-rounder.

"Knock knock!"

Chen Heyu raised his finger and tapped on the table.

Shi Yijia understood in seconds, glanced at the interview list, and the eye-catching word "P5" came into view, and her heart trembled.

Since its establishment, this is the fourth "P5" level employee!

Among the first three people, one is a master in the field of spacecraft design, proficient in aerodynamics, structural design and human-computer interface interaction;

The other is a materials scientist with a solid foundation in materials science and engineering, including an understanding of material structure, properties, processing, and properties.

Familiar with the research and development methods of various composite materials and high-temperature resistant materials, and be able to design new materials to meet the requirements of spacecraft parts;

The last one is a rocket engineer who is familiar with various areas of propellant, thrust control, and aerodynamics.

Each one is a top expert in the industry!

"Is Bao Xiangwen qualified?"

Shi Yijia had a hint of suspicion in her heart, but as a working boy, she naturally wouldn't ask more.

"Mr. Bao, what are your requirements for salary?"

Shi Yijia saw the big boss nodding, so she went straight to the point.

"Just look at the company's arrangement."

Bao Xiangwen replied in a sullen voice that he had read the job postings on the Internet, and with his ability, it should be more than enough to apply for a competent engineer (P3), with a salary range of between 26,000 and 32,000.

No matter how you calculate it, it is several times stronger than the original 10,000 yuan!

"Mr. Wei, how do you feel?"

Chen Heyu asked casually.

"I am extremely optimistic about Mr. Bao's ability, and if he is placed in the Eurocontinental Space Agency, he can also get the position of senior director."

Wei Guangji told the truth without the slightest concern.

Bao Xiangwen is happy, he is always happy to be recognized, can he be promoted to another level for the P3 position he interviewed?

After the three of them communicated, they informed Shi Yijia of the interview results.

Chen Heyu and Wei Guangji got up to say goodbye, and Shi Yijia was the only one left in the house.

"Mr. Bao, after the evaluation of the boss and Mr. Wei, your entry level is P5, and the position is the chief engineer of the rocket propulsion department, with a probationary period of two months, and your salary and benefits are not discounted.

Basic monthly salary: 60,000 Chinese dollars, quarterly bonus every three months, year-end bonus at the end of the year, minimum salary of 15;

In other aspects, there is a accommodation subsidy of 2,000 yuan, a transportation subsidy of 1,500 yuan and a food subsidy of 1,500 yuan per month, and the enterprise pension and supplementary medical insurance will also help you purchase a complete package.

By the way, you have a wife and children, right? Medical insurance can cover your immediate family! ”

Shi Yijia said in one breath, smiling and looking at each other.

P5！

The monthly salary is 60,000 Chinese dollars, and the minimum salary is 15!

Coupled with a subsidy of 5,000 yuan per month, the annual salary directly exceeds one million!

Bao Xiangwen was momentarily stunned, he knew that Yun Kun's treatment was good, but he didn't expect that it would be much beyond his imagination.

From a monthly salary of 10,000 to an annual salary of 1 million! It only took a few days?!

Bao Xiangwen had an unreal feeling, stunned, and subconsciously asked: "Mr. Shi, isn't the position I interviewed for a senior chief engineer?" Only P3 grade, huh? ”

"That's right, the boss personally transferred you to the rank! Or, if you have any other additional requirements, you can give me feedback.

In addition, according to your level, we can equip you with a three-bedroom house and a 500,000 yuan scooter in Qindao, and if you accept this benefit, the housing allowance and transportation subsidy will be automatically canceled. ”

Shi Yijia explained.

"Let me slow down, can I think about it first?

No, no, no! I mean, it's not about choosing a garage or a subsidy, not about whether or not to get hired.

You see, I have all my suitcases? ”

Bao Xiangwen pointed to the black suitcase in the corner and couldn't help laughing.

"Naturally, no problem, after you think about it carefully, you can inform me at any time, and you can also move in first in the near future."

Shi Yijia added.

"Thanks, trouble."

Bao thanked Wen.

"Later, I will ask my administrative colleagues to take you over to check in, and then officially join the company next Monday."

Shi Yijia stretched out her hand, shook hands with Bao Xiangwen, and reminded warmly.

……

Two hours later, Bao Xiangwen lay on the soft sofa and looked around, the area of the suite was 120 square meters, with three bedrooms, one living room and two bathrooms, and complete furniture and household appliances.

It is several times more luxurious than his house in Fengjing.

Pushing open the glass door of the living room, he stood on the balcony, breathing the sea breeze, and hurriedly took out his mobile phone to report to his daughter-in-law that he was safe.

"Wife, everything went well in the interview, and I will join the company next Monday."

Bao Xiangwen grinned.

"So happy? Is there a salary of 30,000? ”

The wife asked curiously, and at the same time felt relieved and proud of her husband.

"Be bold and double!"

Bao Xiangwen was rarely arrogant, straightened his waist, looked at the blue sky and white clouds in the distance, and said leisurely.

"60,000?! Don't lie to me, don't talk about it, Vivi is home, I have to cook. ”

The wife hung up the phone in a hurry.

"But, it's really 60,000."

Bao Xiangwen said helplessly, this joy was destined to be in his heart, and his wife slowly accepted it.

At the same time, there has been a wave of resignations in aviation research institutes across the country.

"If you don't want to do it, fuck me off! You don't do it, but more people do it! ”

The director of the research institute pursed his lips, looking like he didn't care at all, and he didn't expect what kind of impact the departure of this group of people would have.

……

"Boss, Moss Ai Glasses 2.0 will be officially released tomorrow, at 10 a.m., 1 million pieces in stock!"

Zhang Nan called to synchronize the company's latest news.

"Well, I know, remember to do what I told you last time!"

Chen Heyu commanded.

Gentlemen, there will be no change at 0:00 in the past two days, I'm afraid that it will affect everyone's rest, so the lords will rest early.

(End of chapter)