Learning Demon Cultivation System

"Ah... well, I like creatures." Li Zheng had no choice but to say something very against his will for the sake of [Five Sons Enrolling].

"Okay, don't be nervous." Shen Tinglan said with a smile, "It's just a half-day vacation. I'm not Chen Hongbing. From now on, you can do whatever you want."

"Sure enough, I followed the right person." Li Zheng waved his fist excitedly.

"It's my glory." Lin Yujing clamored and punched.

"Why did it start again?" Shen Tinglan asked, "Do you still want to hear the cause of the failure?"

"Listen!" The two said in unison.

Next, Shen Tinglan reproduced for them the launch center on August 8th, that night unknown to outsiders.

……

On August 2019, 8, Wenhai Space Launch Site, Command Center.

20 o'clock, 07 minutes, 00 seconds.

"ignition!"

With the order of the messenger, a thin red line appeared on the tail of the rocket.

Then, the red line exploded suddenly, like a little sun was born out of the sky.

But Shen Tinglan, who was sitting in the front row of the command center, knew very well that these were actually five little suns.

At the center is the core-stage YF-86 engine of the rocket's main rocket body. A huge amount of hydrogen and oxygen fuel is injected into the combustion chamber by two turbo pumps, and the pressure reaches 1 atmospheres in just one second. During the combustion, the temperature of liquid hydrogen instantly rose from -100 degrees to over 253 degrees.

In the next 500 seconds, this engine will maintain this state, consume all the fuel, and then separate from the main body of the rocket, and the core second-stage engine above it will continue to complete its mission.

And the four little suns around are Huang Er's four boosters.

Each of these four boosters is equipped with two 120-ton YF-90 kerosene engines. Compared with the core-level rocket, these four guys are the real giants. They will take off in the most difficult 300 seconds of the rocket Burning savagely, Huang Er supported more than 90% of the take-off thrust.

They are like the two hands of parents, burning themselves out regardless of the cost, just to support the child Huang Er's dream of soaring into the sky, and then let go, not adding a kilogram of burden to the child.

Looking at the little sun in the picture, Shen Tinglan clasped his hands and meditated in his heart.

fly, fly.

Little Huang Er, try to fly upwards.

Not only her, but everyone in the command center seemed to be meditating silently.

No one spoke, everyone was welded to their posts like nails, with only screens and data in front of them, data that had been tempered hundreds of times.

They seem to be staring at a newborn baby, and even a faint cough can make them extremely nervous.

It's like they're staring at a dying old man and just hope he can make it through the last 2000 seconds.

In this silence, the broadcast of "tracking normal" every 10 seconds seems to be the sound of "beep" of the electrocardiogram. Although it is only boring and repetitive, it is the sound that everyone wants to hear most.

This broadcast is like a basic rhythm, leading Shen Tinglan to scan the core data on the main monitoring screen once every 10 seconds.

Just do it like this 200 or so times and you're done.

But on the 18th time, a change occurred.

The core stage is composed of two YF-86 engines, and the instantaneous thrust of one of the extensions has been reduced from 518KN to 506KN.

It's a small change, like a baby's cough.

But Shen Tinglan knew that the baby would not cough at this moment.

At this stage, as the altitude increases, the air becomes thinner and the resistance gradually decreases, the instantaneous thrust of the hydrogen-oxygen engine should be increased at a slow speed, and there should be no obvious drop.

Just like the second extension, its thrust is still maintained at a high point of 522KN.

Of course, this may be just a short-term uneven combustion, or a small gap in the instantaneous fuel injection density. After all, drinking mineral water sometimes takes a big mouthful and a small mouthful. Physics will always make such a little joke occasionally.

But Shen Tinglan's eyes were still fixed on this data.

After 10 seconds, the data is refreshed.

[core level A thrust: 506→214]

[core level B thrust: 522→529]

Shen Tinglan was suffocated.

Without any preparation for gradual change, it was directly cut in half.

Then the alarm sounded, and the monitor made a report as calm as possible: "It has been detected that the thrust of the core first-stage engine has dropped significantly."

The one who suffocated with Shen Tinglan was Chen Hongbing beside him.

But Chen Hongbing's breathing only stopped for three seconds.

He had already rehearsed various situations, and this was not the worst.

"Ballistic group." Chen Hongbing said into the microphone, "At this stage, if the first core is separated in advance, can the redundant fuel of the second core and the third core successfully push the satellite into orbit."

"According to calculations, the first core needs to persist for 70 seconds in the current state, and the second and third cores can complete the task."

The engineer of the ballistic team replied almost instantly, which shows that they started the software calculation long before Chen Hongbing asked.

As soon as the voice fell, new data came.

[core thrust: 214→37]

Almost at the moment when the data appeared, Chen Hongbing spoke again: "Ballistic group, recalculate."

5 seconds later.

"Report, with the current arrow situation, Huang Er will not be able to enter the established orbit."

The scene fell silent again.

[core thrust: 37→6]

"Report, the core first-stage engine... an extension... has... shut down."

This time, the monitor could no longer maintain a stable mood.

Even Shen Tinglan found that she was just a fragile little girl, faced with such a situation, she couldn't speak a word, and her mind went blank.

Chen Hongbing asked again: "Forcibly separated, can the satellite be sent into low orbit."

"Report, the current rocket situation, the rocket cannot reach the first cosmic speed."

【Core primary thrust: 8→null】

"Conduct ballistic analysis on the existing monitoring." Chen Hongbing ordered.

This time the wait was a bit long, but it was only about ten seconds.

"Due to the shutdown of the first extension plane alone, Huang Er has deviated from the established trajectory. If the situation remains unchanged, the rocket body will accelerate and fall into the Eastern Pacific Ocean under the sole thrust of the second extension plane."

This time, Chen Hongbing didn't speak immediately, but after a few seconds of hesitation, he looked heavily at Zhao Zhenhua beside him.

Zhao Zhenhua's expression didn't change much, but his eyes were red.

"Prepare to salvage with all our strength."

"Yes." Chen Hongbing ordered, "The launch failed, and all engines were turned off in an emergency to allow the rocket body to fall into a relatively nearby sea area. Urgently contact the Oceanographic Bureau and the Meteorological Bureau. Do your best to salvage it."

At this moment, everyone seemed to be emptied.

The baby did not survive.

The old man couldn't stand it either.

Before Chen Hongbing got up, he held the back of Shen Tinglan's hand and shook it heavily.

"I can't stand it, there are many people who can replace me."

"But no one can replace you."

"Don't resign, don't run away."

"I top it."

……

Inside the car, Shen Tinglan's eyes turned red.

Even though it had been so long, that night was still enough to bring out the deepest pain in her life.

"Hmm..." Lin Yujing put her hand lightly on her mother's arm, "Thank you...Mom."

This was the first time Shen Tinglan told her about that night in a long time.

Although Li Zheng was also deeply saddened, this did not affect his basic analysis.

"It takes about 30 seconds from the onset of the omen to the complete shutdown. Although the process is fast, it is still a linear process."

"There is no change in the appearance, and there is no explosion. It can be seen that there is no fuel leakage, the combustion chamber is not damaged, and there is no contact with the pre-combustion chamber in advance. This eliminates many faults."

"Under this premise, if the thrust continues to decrease...then there can only be a problem with fuel injection." Li Zheng nodded and said, "Well, this matches the parameters given by the algorithm."

"You really didn't do nothing in the test group during this time." Shen Tinglan wiped his eyes and gradually recovered his calm mood, "In the design of 86, liquid hydrogen and liquid oxygen are stored separately, and the hydrogen and liquid oxygen are stored separately. The turbo pump and the oxygen turbo pump are injected into the combustion chamber. My first reaction is that one of the pumps has a problem. From experience, the oxygen pump has a higher probability of problems because it is born to withstand a strong oxidizing environment. It was also the basis of our first failure model."

"But... I haven't had this kind of problem in the ground test for so long." Lin Yujing said unwillingly, "And the first-level core has two engines. Under the same environment, isn't the other engine working fine? of."

"If the Oceanic Bureau can salvage Huang Er, your question will probably be answered." Shen Tinglan sighed, "But now, we have answered it based on simulation. The heat of the rocket after take-off is extremely complicated. There is a vibration problem that makes everyone a headache. It is impossible for our test run to simulate all environments, so we can only explain that the mechanical and thermal environment of the rocket engine has reached a test level when it was about 180 seconds into the air. The severe conditions that cannot be simulated lead to abnormalities in the local structure of the turbine device, and then it is impossible to inject fuel into the combustion chamber."

"That's the only way to go..." Li Zheng also lowered his head and sighed, "It would be great if it could be salvaged... You'll know it once you dismantle it... But it's really difficult to locate it... I don't know where it will be swept by the waves. "

"Maybe Mei Ri was the first to steal it away." Lin Yujing yelled again, "Bad!"

"Okay, stop conspiracy theory." Shen Tinglan turned the wheel, and the car drove back to the hospital, "Returning to zero can be so smooth, the diagnosis given by you and Shiyi is indispensable. Based on the test results, we The fault point has been locked on the oxygen turbopump. Under a special environment, the shafting will indeed crack or even break. As you know, in order to pursue greater thrust and specific impulse, the pressure of the combustion chamber is It needs to go up to a hundred atmospheres, and to inject fuel, the speed of the turbine and the pressure of the pre-combustion chamber must be greater, plus the low temperature environment and strong oxidation. This turbo pump can be said to be the most difficult point in aerospace engineering. difficulty."

At this point, Shen Tinglan stopped the car, turned sideways and said seriously.

"If aerospace engineering is an examination paper, which is used to test a country's cutting-edge industrial strength, then this pump is the final big question of the examination paper."

"Hmm!" Lin Yujing became more and more excited as she listened, "The heaviest jewel in the aerospace crown!"

However, Li Zheng thumped Lin Yujing's armchair with great reluctance: "So in the end, it's actually a process problem...or is it a material science problem?"

"No, no, blindly complaining about craftsmanship and materials is the biggest misunderstanding in engineering." Shen Tinglan was not in a hurry to get out of the car, and explained on the spot, "Engineering is a whole. , use our knowledge and brains to design a rocket that can be successfully launched. When facing failure, don't push the responsibility to the craftsmanship and materials. They have been strictly tested when they leave the factory and meet our engineering standards. Of course, in breakthrough projects, we still have the right to require more advanced technology and better materials, but we should not place all the blame on them. After all, there is no indestructible steel plate in the world. Even if there is, we should use it. Sorry."

"Ah..." Li Zheng sighed thoughtfully, "I'm narrow-minded... Teacher Shen is right, the cook shouldn't complain about the ingredients."

"Cook..." Shen Tinglan was stunned for a moment, and then couldn't help laughing, "It turns out that an engineer can be compared to a cook... I also learned it."

"Aside from other things, Li Zheng's fried fish steak is delicious." Lin Yujing may have thought of the gourmet experience, and unexpectedly said something nice, "Let him make it for you later."

"In two days, I'll treat you to dinner after the reset is over." Shen Tinglan shook the car key and said, "During this time, the Sixth Hospital has to improve the oxygen pump part of the engine. To further optimize the structure, it is best to further strengthen the vibration suppression.”

"Shock?" Li Zheng asked.

"Ah, you haven't learned this yet, let's go upstairs and teach you." Shen Tinglan stretched her waist, and she was in a good mood, "Most of the time the rocket runs at super-high speed and breaks through the air resistance. The vibration generated in the rocket will affect the operation of every part of the rocket. It can be said to be the number one enemy of the rocket. One of our design difficulties is to resist vibration and better protect the operating environment of each part. Now we know Why do you want to recruit people who are talented?"

"I see." Li Zheng followed Shen Tinglan and got out of the car excitedly, "It's too empty to call you teacher, I'll just call you teacher wife!"

"Ah..." Shen Tinglan was taken aback again, "This..."

"Give me the 'teacher'!" Chen Hongbing suddenly appeared swaggeringly, "How many times have I said, just call Mom, why are you so polite here?"

This time Shen Tinglan was used to it, and did not run away: "Go, leave us alone."

"Don't, don't, you have to come too." Chen Hongbing waved his hand, "We're holding a summary meeting with the Sixth Hospital, so you have to come."

"En." Shen Tinglan responded, and handed the office key to Lin Yujing, "Go to my office first, and quietly give Li Zheng the recent study materials, study hard, and don't fight."

"Oh."

"Yes."

After the two of them left, Chen Hongbing sneered and said, "Why are you acting like a summer nursery class... don't fight? The dry fire is in your office. Is that a fight?"

"Ah." Shen Tinglan also covered her mouth, and quickly took out her phone, "The ones with monitors... I have to tell them..."

"Hey, let's go." Chen Hongbing waved his hand, leaned close to Shen Tinglan's ear and whispered, "Aren't you wondering what they are doing together? Don't worry, I will take care of this matter. I will accompany you to watch the surveillance later. .”

"!" Shen Tinglan was shocked at first, and then backed away, "You don't often watch my office surveillance, do you?"

"I'm idle!" Chen Hongbing cursed and waved his hands, "Besides, it really looks like it's surveillance work."

"It's terrible, I'll be transferred when the Huang Er project is over..."

"Hey, hey, don't look, don't look, just kidding."