The thermal protection of scramjet engine is one of the most important key technologies, for ordinary engines, it puts forward new requirements on protective materials, the temperature of the hot air flow in the engine flow channel reaches 3,000 K, almost 2,720 degrees, and the temperature of the combustion chamber reaches 3,600 K.

If you only need to solve the temperature, it will not be enough to let Xu Mang come over, and the complex laser wave system, combustion pulsation and oscillation of the scramble engine can easily make the combustion chamber avoid generating too high temperature, thus destroying the entire combustion chamber.

Judging from the information given to Xu Mang by Director Guo, the use of cooling structure to reduce the temperature has also been considered, but it will lead to increased weight and reduce the performance of the engine.

The simplest thing is to change the structure, or to improve the performance of thermal protection materials, and the team led by Director Guo chose the second direction to improve the performance of materials.

Due to the tight schedule,

In addition, Xu Mang's own propulsion technology and aviation power skills are still insufficient, so he can only make selective breakthroughs, and there are some technologies that need to be solved by himself.

First of all

Xu Mang put forward six problems that need to be solved, including heat resistance, oxidation resistance, thermomechanical load, corrosion resistance, technical preparation index, and the lightweight of the latter item on the left, six indicators represent six problems.

"Damn..."

"Mistakes overestimate yourself. Xu Mang grabbed his hair and blushed at the oath he had just made, is there any difference between this and the fact that the white cat owes a hundred chapters and said that it could be paid off in the New Year, but now it doesn't say a word?

"Shame on you!"

"I really blush for myself!" Xu Mang sighed, according to his own calculations, in fact, the skill value is just right, just a little more time, but he forgot to use the 'Beast Mode' to deduct the skill value.

Right now

I can only write slowly at the speed of the turtle, starting with the antioxidant ...

For antioxidants,

Xu Mang has a wealth of knowledge, according to the characteristics of scramjet engines, it is necessary to absorb oxygen in the atmosphere for oxygen-rich combustion, and the high-speed air flow will also produce atomic oxygen because of the shock wave, which directly leads to more serious oxidation.

In terms of thermomechanical loads, thermal stresses arise due to uneven distribution of heat flow in the flow channel, and noise loads can occur if the air flow is fast... Therefore, the material requirements must not be deformed, so as not to affect the performance of the engine.

Boom,

Xu Mang wrote for more than an hour, and finally wrote the six questions clearly, I originally thought there were not many, but now it seems... It's all a problem!

"Ugh..."

"I don't want to work hard... Or just be a salted fish. Xu Mang slumped in the chair and looked up at the ceiling, in fact, he didn't need to work hard anymore, he married a wife who was so good at making money, what kind of effort did he have to work on?

"No way!"

"If you want to die in life and have no dreams, isn't that a special life in vain?" Xu Mang brainwashed himself and began to work hard again.

In just five minutes,

┻━┻︵╰(‵□′)╯︵┻━┻

Keep upgrading!

Xu Mang casually picked up a book on propulsion technology and aviation power, put it directly on his face, and then sat there and fell asleep.

+3 propulsion technology and aerodynamic skills

+3 propulsion technology and aerodynamic skills

...

A week has passed in the blink of an eye,

Xu Mang lived like a ghost all day long, sleeping like crazy during the day, spending two hours on the phone with Xiao Man at night, and then continued to cover his face with books on propulsion technology and aviation power, frantically obtaining the corresponding skill points.

This week down,

The effect is still very significant, through Xu Mang's efforts, the distance from propulsion technology and aviation power mastery, only 10 percent difference.

"Jingle bell!"

The alarm goes off,

Xu Mang glanced at the time, half past eight... He is especially late, maybe Xu Mang is a supernumerary, for his late arrival and early departure or absenteeism for a day, Director Guo basically turns a blind eye, sometimes unfortunately, when he meets Xu Mang who is late or leaves early at the door, he can only say hello to him with a slight face.

Put on my clothes and pants, and wash up briefly,

Xu Mang drove to the place of work, passed by a golden arch, went in to buy two breakfasts, and when he came back, he found that the car was posted with a ticket, the speed was very fast, if he came back a little later, it was estimated that the car would be towed away.

While driving the car, eating a hamburger, walking through an intersection, suddenly flashed forward, Xu Mang looked confused, as if... I was filmed myself.

finally

When I arrived at the place of work,

With a light step, he slowly swallowed the building, so that he could not die... I met Director Guo.

"Xiao Xu?"

"Just here?" asked Director Guo with a smile.

"Huh?"

"Hmm!" Xu Mang nodded and said seriously: "There is a traffic jam." ”

“...”

"Next time I come early, there will be no traffic jams. Director Guo was quite helpless, the person in front of him couldn't criticize at all, and he didn't even have the right to point fingers, so he could only knock on the side and say: "You are quite close to the place of work, and you will basically not encounter a big blockage if you come early." ”

Xu Mang nodded, and said with a face full of shame: "But I can't get up!"

“...”

"That's... Director Guo didn't know what to say for a while, looked at Xu Mang embarrassedly, and said with a wry smile: "What's wrong with the progress?"

"Where's the material?"

"It's coming... Give me two more days. Xu Mang sucked the soy milk and said absentmindedly: "It's basically over." ”

Words fall,

Picked up another cup of soy milk and handed it to Director Guo.

"Director Guo?"

"Do you want to drink?" Xu Mang said with a smile: "It's a bribe." ”

"Ahem!"

"Not thirsty... Keep it for yourself. Director Guo said seriously: "Xiao Xu... It's not that I'm too careful, I'm full of calculations that you've worked for fifteen days, but these fifteen days... What kind of situation do you know in your own heart, and you tell me that it will be over in two days?"

"That's right!"

"What's wrong?" Xu Mang asked curiously, "There is no problem, right?"

“...”

"Nothing... Go to work. Director Guo nodded and went up to the third floor with Xu Mang.

Coming to the door of his office, Director Guo suddenly stopped, looked at Xu Mang's back, and couldn't help frowning, he felt that this young... It seems to be floating, floating a little too much, but there is no way, empathy, if he has achieved so much at his age, he may float higher, farther and more indulgent than him.

Walk into your own office,

Director Guo pondered for a moment, silently picked up the landline earpiece at hand, and called his old friend.

"Hello?"

"Old Yang... Your niece-in-law seems to... Not working?" Director Guo didn't go into too much detail, and said seriously: "Is there something troublesome he has encountered recently?"

"What?"

"Impossible, right?" Uncle was stunned for a moment, and said seriously: "Xiao Xu has always been strict about his work, and it is impossible to say that he is not in a state, even if there is... With Xiao Xu's self-control ability, he will also get his state back. ”

“...”

"Old Yang!"

"Don't talk so much. Director Guo said helplessly: "You don't know Xiao Xu's recent performance, he arrives late and leaves early every day, and sometimes he can't even find anyone, to be honest... This is not like Xiao Xu's work attitude. ”

This time,

It was the uncle's turn to be confused, and in his impression, Xu Mang was not like this.

What's going on now?

"Ahem!"

"I called an elder and asked what was going on. ”

Words fall,

The uncle hung up the phone directly, and then called the principal of Fuda University.

According to the seniority, this is his second uncle.

"Hello?"

"Second uncle... What is Xiao Xu's work status like at school?" The uncle asked curiously, "He hasn't been working in the capital recently, and then I received a call from an old friend telling me... Xiao Xu's work attitude is problematic, he arrives late and leaves early every day, and sometimes he can't even find anyone. ”

“...”

"That's right!" The second grandfather sighed, with a little helplessness in his tone: "You must not be deceived by his innocent image, or have a delusion because of media reports, in fact... This bastard's ability to mess around... Alas..."

Uncle is completely confused, this... Things seem to be getting weirder and weirder.

"Second uncle?"

"I don't understand one thing, this... The Xiao Xu in your mouth seems to... It's a little untrue. Uncle said.

"You're new to him, and you'll know after a while. The second grandfather said: "Anyway, tell your friend, you don't need to deliberately stare at Xu Mang, the tighter you control, the stronger this kid's ability to make trouble, and in the end, be careful that the house will be demolished for you." ”

"In short, two words - free-range!" the second grandfather said solemnly.

Stocking?

This...

Will this work?

The uncle hesitated for a moment, and hurriedly asked, "Second uncle... Are you sure? Are you sure to keep Xiao Xu in a free-range state? The project he participated in is not simple!"

"Don't worry!"

"There's nothing wrong with listening to me. The second grandfather said indifferently: "Don't care about him, you can't control it... I've been with him for almost a year and a half, and I can tell you very clearly that you don't have to deal with him. ”

Uncle opened his mouth, hesitated for a long time, and said, "Okay!"

"That's right!"

"Let your friend ask Xu Mang, when will the project end, as long as Xu Mang says a time, it will basically be eight or nine. The second grandfather reminded.

"I see!"

hang up

Uncle called Director Guo directly.

"Hello?"

"Lao Guo... Let me tell you one thing, Xiao Xu is such a work attitude, you don't need to deal with him, just let him fend for himself. When the uncle said this, the whole person fell into an embarrassing predicament.

"You..."

"I said Lao Yang... There is no such Dharma protector for the calf!" Director Guo's face was full of black lines: "This is not a joke... You know how important this project is!"

"Ugh..."

"Anyway, you'll listen to me once!" Uncle asked again, "By the way... Did Xiao Xu tell you when it would be completed?"

Director Guo hurriedly said: "Two days later, isn't this?"

"Ahem!"

"Maybe he's serious. Uncle smiled bitterly: "Or... We'll talk in two days?"

Director Guo: ???

......