Chapter 697

The thermal protection of scramjet is one of the most important key technologies. For ordinary engines, it puts forward new requirements on protection materials. The temperature of hot air flow in the engine passage reaches 3000 K, which is about 2720 degrees, and the temperature of combustion chamber reaches 3600 K.

If only the temperature needs to be solved, Xu mang will not come over. The complex laser wave system, combustion pulsation and vibration in the scramjet engine can easily avoid the high temperature of the combustion chamber, thus causing damage to the whole combustion chamber.

According to the information provided by director Guo to Xu Mang, cooling structure has been considered to reduce the temperature, but it will increase the weight and reduce the performance of the engine. Moreover, due to the special structure of scramjet, the cooling mode can not be applied and it is difficult to apply it on a large scale.

The simplest way is to change the structure or improve the performance of thermal protection materials. The team led by director Guo chose "shame!"

"I blush for myself!" Xu sighed. According to his own calculation, the skill value is just good. He just paid a little more time, but he forgot to deduct the skill value when using "animal mode".

At present,

only tortoise can write slowly, starting from the oxidation resistance...

for anti oxygen,

Xu mang has a wealth of knowledge. According to the characteristics of scramjet, it needs to absorb oxygen in the atmosphere for oxygen enriched combustion, and the high-speed airflow will produce atomic oxygen due to shock wave, which directly leads to more serious oxidation.

In terms of thermal mechanical load, due to the uneven distribution of heat flow on the flow passage, thermal stress will be generated. If the air flow speed is fast, noise load will be generated. Therefore, the material requirements shall not be deformed to avoid affecting the engine performance.

Shua Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua, Shua!

"Alas..."

"I don't want to work hard... Or I'll be a salted fish." Xu mangtan in the chair, looking up at the ceiling, in fact, he does not need to work hard, married a wife who can make money, what efforts?

"No way!"

"Life is dying without dreams. Isn't it in vain?" Xu mang washed his brain and began to work hard.

In just five minutes,

┻┻┻┻┻┻┻┻┻┻┻┻┻┻┻┻┻┻┻┻┻┻┻┻┻┻!

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

Propulsion technology and aero power skills + 3

propulsion technology and aero power skills + 3

...

after a week in a flash,

Xu mang was living like a ghost all day, sleeping like a ghost in the daytime, spending two hours on the phone with Xiaoman at night, and then continued to cover his face with books on propulsion technology and aviation power to obtain corresponding skill values.

At the end of this week,

the effect was still very significant. Through Xu Mang's efforts, he was only 10% away from his mastery of propulsion technology and aviation power.

"Ring the bell!"

When the alarm clock goes off,

Xu mang looks at the time at 8:30... He is late again. Maybe Xu mang is an outsider. For his being late and leaving early or absent from work 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 smile and say hello to him.

After putting on his clothes and clothes, Xu mang drove to his work place, passed by a golden arch, went in and bought two breakfast. When he came back, he found that the car was pasted with a ticket, which was very fast. If he came back a little later, he estimated that the car would be towed away.

While driving and eating hamburger, I passed an intersection. Suddenly, there was a flash at the top of the front. Xu Mang's face was confused, as if... He had been photographed.

Finally,

arrived at the work place,

walked with a light pace and slowly swallowed away the building. It was so good to die that I met director Guo.

"Xiao Xu?"

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

"Ah?"

"Well!" Xu mang nodded and said earnestly, "there is a traffic jam."

"..."

"come early next time, there will be no traffic jam." Director Guo was quite helpless. The man in front of him could not criticize at all. He did not have the right to point his finger. He could only knock aside and say, "you are very close to your work place. If you come early, you will not encounter heavy traffic."

Xu mang nodded and said with shame, "but I can't get up!"

"..."

"that... That..." director Guo didn't know what to say for a while. He looked at Xu mang awkwardly and said with a bitter smile, "what's the progress

"Materials?""Soon... Give me another two days." Xu mang sucked soybean milk, absentmindedly said: "basically can end."

Then he picked up another cup of soybean milk and handed it to Director Guo.

"Director Guo?"

"Drink?" Xu mang said with a smile, "it's bribery."

"Cough!"

"Not thirsty... Keep it for yourself." Director Guo said seriously: "Xiao Xu... I'm not too thoughtful. I'm all right. You worked for 15 days, but you know what kind of situation is in your mind. As a result, you told me that it will be over in two days."

"Yes

"What's the matter?" "Is there any problem?" Xu asked curiously

"..."

"nothing... Go to work." Director Guo nodded and went to the third floor with Xu mang.

At the door of his office, director Guo suddenly stopped and looked at Xu Mang's back. He could not help frowning. He felt that he was young. It seemed that he had gone too far, but there was no way to do it. If he had achieved so much at his age, he might have gone higher, farther and more indulgent.

When he walked into his office,

director Guo pondered for a moment, quietly picked up the receiver and called his old friend.

"Hello?"

"Lao Yang, it seems that your nephew and son-in-law are not working?" Director Guo didn't say it in detail. He said seriously, "is there something bothering him recently? It leads to a bad mood? "

"What?"

"No way?" The uncle was stunned for a moment and said solemnly: "Xiao Xu has always been strict with his work. It is impossible to say that anything is not in the state. Even if there is... With Xu's self-control ability, he will find his state."

"..."

"Lao Yang!"

"Don't be so full of words." Director Guo reluctantly said: "but you don't know Xiao Xu's recent performance. You come late and leave early every day. Sometimes you can't find anyone. To tell the truth... It's not like Xiaoxu's work attitude."

This time,

it's the turn of Uncle Meng. In his impression, Xu mang is not like this.

What is the situation now?

"Cough!"

"I'll call an elder and ask what's going on."

As a result,

uncle hung up the phone directly and then called the president of Fuda.

In terms of seniority, this is his second uncle.

"Hello?"

"Second uncle... What is Xiao Xu's working state like at school?" Uncle curiously asked: "he is not working in Beijing recently, and then I received a call from an old friend and told me... There is something wrong with Xiao Xu's work attitude. He is late and leaves early every day, and sometimes he can't find anyone."

"..."

"that's right!" The second grandfather sighed, with a little helplessness in his voice: "you must not be deceived by his innocent face, or be misled by the media reports. In fact, the troublemaker's ability to make trouble... Alas..."

uncle is completely confused, and this... Things seem to be more and more strange.

"Second uncle?"

"I don't understand. It seems that Xu in your mouth is a little unreal." Said the uncle.

"You have just come into contact with him. After a long time, you will know." The second grandfather said, "tell your friend that you don't need to stare at Xu mang. The more tightly you are in charge, the stronger the boy's ability to make trouble. In the end, be careful that the house will be demolished for you."

"In short, two words - stocking!" Two granddad said solemnly.

Stocking?

This...

can this work?

The uncle hesitated for a moment and asked in a hurry, "are you sure, second uncle? Are you sure to let Xiaoxu be in the stocking state? The project he participated in was not simple

"Don't worry."

"It's not wrong to listen to me." The second grandfather said calmly: "don't care about him. I've been with him for nearly a year and a half. I can tell you clearly that don't care about him."

The uncle opened his mouth, hesitated for a long time, and said, "good!"

"Yes

"Let your friend ask Xu mang when the project will be finished. As long as Xu mang says a time, it's almost impossible to leave." Two grandfather reminds way.

"I see!"

Hang up,

uncle called director Guo directly.

"Hello?"

"Lao Guo... To tell you one thing, Xiao Xu has such a working attitude. You don't need to pay attention to him and let him live and die on his own." When uncle said this, the whole person fell into an awkward predicament."You..."

"I said Lao Yang... Does not have such a Dharma protector!" Director Guo has a black line on his face: "this is not a joke... You know how important this project is!"

"Alas..."

"in short, you just listen to me once!" "By the way, did Xiao Xu tell you when to finish it?" he asked

Director Guo said in a hurry: "yes! Two days later, isn't that bullshit? "

"Cough!"

"Maybe he's serious." The uncle said with a wry smile, "shall we talk about it in two days?"

Director Guo:???

......

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