Chapter 302

After lunch, some stayed at the end of the test ground, while the main team drove back to headquarters by road.

Naturally, Li Zheng dawdled on Aunt Shen's familiar little white car.

Lin Yue Jing sat on the vice-driver, just fastened the seat belt and turned back, and bared his teeth and shouted: "enough conscious ah."

Li Zheng also learned her way to grin: "Hi, what are you polite to Aunt Shen?"

"Mom!" Lin Passover turned his head and rushed to Shen hearsan and said, "you see his face is not thick."

"Well I actually eat this one. " Shen hearsan hides his face and smiles, and starts the car and drives out with wheels. "OK, you two don't tease you first, Lizheng is back. It's time to say that it's right."

The two quickly closed up the clamor of the mood, honest and honest.

"I have asked the secretary. To get you to participate in the work further, a lot of technical content should be open to you."

"But opening up means you are more difficult to go abroad."

"Considering these, I suggest that you put your work on the spot for a while, prepare for iPho, and then contact them after the end of November iPhone. How about it?"

"It's all said, no more." "I have made it clear when I interviewed," Lin said

Li Zheng nodded with him: "well, I just need to give the medal back to the old brother."

"So simple?" Shen heard Lan was slightly surprised, "I think you are a very targeted person, Lizheng."

"Once there are bigger goals, there is no longer much to think about the small goals before." Li Zheng shook his head and smiled, "to make 1% of Huang Er successful, its weight is more than 100 international gold medals."

"Ah, this sense of purpose is really strong..." Shen hearsan glances at the forest of eyes and says, "what about you, it doesn't matter?"

"The exam is just a means, not an end." Lin Yu Jing threw his head. "Now I have reached my goal. Whether it is Huang er or astronomy department, I can't take the exam again in my life."

"It's your own decision. Don't regret it." Shen heard Lan said quite positively.

Lin Passover Jing urged: "say it quickly, wait for the core cause of the failure for a long time."

Li Zheng laughed: "I will not regret it. I have lost interest in all competitions now."

Shen heard LAN immediately asked: "but you still went to the biology examination this morning."

"Ah This, I like biology. " Li Zheng had to say something very contrary to his heart in order to [five children enter the Department].

"OK, don't be nervous." Shen heard LAN smile, "half a day off just, I am not Chen Hongbing, you will also be free in the future."

"I am sure I am right." Li Zheng was excited to wave his fist.

"It's my light." Lin Yue shouted at his fist.

"How it's going to start again." Shen heard LAN quality asked, "do you want to hear the cause of the fault?"

"Listen!" The two spoke in unison.

Next, Shen heard LAN for them to re-occurrence of the launch center on August 8, that night unknown to outsiders.

……

On August 8, 2019, Wenhai space launch site, command center.

20:00, 07 minutes, 00 seconds.

"Ignition!"

With the order of the commander, a fine red line appeared at the tail of the rocket.

Then, the red line burst, like a small sun.

But Shen heard LAN, who sat in the front row of the command center, knew that it was actually five small suns.

The most central part is the yf-86 engine with the core of the main rocket body. A large amount of hydrogen and oxygen fuel is injected into the combustion chamber by two turbopumps. In only one second, 100 atmospheric pressure has been reached. During this violent combustion, the temperature of liquid hydrogen has risen from -253 degrees to more than 2000 degrees in a flash.

In the next 500 seconds, the engine will remain in this state, consuming all fuel, then leaving the main body of the rocket and continuing to accomplish its mission by the core secondary engine above it.

The four small suns around them are four booster of yellow two.

Each of these four booster is equipped with two 120 ton yf-90 kerosene engines. Compared with the core rocket, these four guys are the real big Mac. They will be savagely burning in the hardest 300 seconds of rocket takeoff, supporting more than 90% of the takeoff thrust for yellow II.

They are like parents' hands, burn themselves up at no cost, only to support the dream of Huang Er, who flies into the sky, and then release their hands, and no longer add a kilogram of burden to the child.

Looking at the small sun in the picture, Shen hearsan holds his hands and silently reads it in his heart.

Fly, fly.

Xiao Huang, try to fly up.

Not only her, but the whole command center, it seemed that everyone was meditating.

Nobody talks. Everyone is welded to his post like a nail. There are only screens and data, hundreds of times of data.They look like they are staring at a new baby, even a faint cough can make them nervous.

They looked like they were staring at an old man dying, hoping he could survive the last 2000 seconds.

In this silence, every 10 seconds "tracking normal" broadcast, like the ECG "beep" sound, although only boring and repeated, but everyone wants to hear the most.

The broadcast is like a basic rhythm, scanning the core data on the main monitor screen at a frequency of 10 seconds with Shen Tinglan.

As long as you do it 200 times or so, it's done.

But on the 18th time, the movement appeared.

The core level I consists of two yf-86 engines, and the instantaneous thrust of one extension has decreased from 518kN to 506kn.

It's a little bit of a change, like a baby's cough.

But Shen heard LAN knew that the baby would not cough at this time.

At this stage, with the increase of height, the air becomes thinner and the resistance decreases. The instantaneous thrust of the hydrogen oxygen engine should be increased at a slow speed and should not decrease obviously.

As with the extension, the thrust is still at a high of 522kn.

Of course, it may be just a short-term uneven combustion, or a small gap in the density of instantaneous fuel injection. After all, drinking mineral water sometimes will be bigger and smaller, and physics will make such a joke occasionally.

But Shen's eyes are still on the data.

After 10 seconds, the data is refreshed.

[core level a thrust: 506 → 214]

core level I B thrust: 522 → 529]

SHEN heard LAN suffocated.

No preparation for a gradient, cut your back straight.

The alarm sounded, and the monitor tried to make a smooth report: "a significant drop in thrust of the core-1 engine extension was detected."

Chen Hongbing, who was suffocated with Shen healan, was beside him.

But Chen's breath was only stagnant for three seconds.

He has rehearsed all sorts of situations, which is not the worst yet.

"Ballistic group." "At this stage, if the core level is separated ahead of time, can the redundant fuel of core two core and three be successfully pushed into orbit," Chen said to the microphone

"After calculation, the core level one needs to be maintained for 70 seconds in the existing state, and the core, two core and three core can be completed."

The ballistic team engineers almost instantly replied, so they had started software calculation before Chen Hongbing asked.

The voice just dropped, and new data came.

[core first thrust: 214 → 37]

almost at the moment of data appearance, Chen Hongbing said again: "ballistic group, recalculate."

After 5 seconds.

"It is reported that the current arrow condition, Huang Er will not be able to enter the established orbit."

The scene is again silent.

[core first stage thrust: 37 → 6]

report, core first stage engine One extension Has "Stop."

This time, the monitor was unable to maintain a steady mood.

Even Shen heard LAN, also found that he was just a fragile little girl, in the face of such a situation, a word can not be said, the brain is a blank.

Chen asked again: "if we can separate the satellite into low orbit by force."

"It is reported that the rocket cannot reach the first cosmic speed due to the current arrow condition."

[core first thrust: 8 → null]

Ballistic Analysis on existing monitoring Chen Hongbing ordered.

This time, I waited a little bit, but it was just a dozen seconds.

"Due to the separate shutdown of the first extension, Huang Er has deviated from the established trajectory. If the condition remains unchanged, the arrow body will accelerate the fall into the East Pacific Ocean under the separate thrust of the second extension."

This time, Chen Hongbing did not immediately speak, but after a few seconds of brief tangle, he looked at Zhao Zhenhua on his side.

Zhao Zhenhua's look has not changed much, but his eyes are red.

"Prepare for salvage."

"Yes." Chen Hongbing ordered that "the launch was unsuccessful, all engines were shut down in an emergency, so that the arrow body could fall into the nearer sea area, and contacted the marine bureau and Meteorological Bureau urgently. Try to salvage. "

In this moment, everyone was as free as they were.

The baby didn't survive.

The old man couldn't hold up.

Chen Hongbing, before getting up, grasped Shen's back of his hand and shook it heavily.

"I can't stand it. There are a lot of people who can replace me."

"But no one can replace you."

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

"I'm the top."

……

Inside the car, Shen heard Lan's eyes were wet red.

Even if it had been so long, that night was still enough to lead to the heavy pain of her life."Well..." Lin Yue Jing's hand gently put on her mother's arm, "hard work Mom. "

This is still the first time in such a long time that Shen Tinglan told her about that night.

Of course, Li Zheng is also distressed, but this does not affect his basic analysis.

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

"There was no change in appearance, no explosion, no leakage of fuel, no damage to the combustion chamber, and no contact in advance in the precombustion chamber, which eliminated a lot of faults."

"On this premise, the thrust continues to drop That's the only problem with fuel injection. " Li Zheng said, nodding, "well, this is in line with the parameters given by the algorithm."

"You've been in the test group for a long time Shen Tinglan wiped his eyes and gradually returned to his peaceful mood. "In the design of 86, liquid hydrogen and liquid oxygen are stored separately. They are injected into the combustion chamber by hydrogen turbine pump and oxygen turbine pump respectively. My first reaction is that one of the pumps has a problem. From experience, the oxygen pump has a higher probability of failure because it is born to withstand strong oxidation environment, which is also me We are the basis of the first failure model. "

"But I haven't had this kind of problem in the ground test for so long. " Lin Qijing not Gandhi said, "and the core level is not two engines, the same environment, the other is not good."

"If the SOA can salvage Huang Er, your questions will probably be answered." Shen Tinglan sighed, "but now, we have solved the problem based on simulation. The force and heat after the rocket takes off is extremely complex, and there is a vibration problem that everyone is headache about. It is impossible for our test run to simulate all the environment. Therefore, we can only explain that when the rocket engine is in 180 seconds, the thermal and mechanical environment of the rocket engine has reached a level that cannot be simulated in the test Cool state, resulting in abnormal local structure of the turbine device, and then unable to inject fuel into the combustion chamber

"This is the only way..." Li Zheng also bowed his head and sighed, "how good it is to salvage it back It's easy to know But positioning is really difficult I don't know where it will be swept by the waves

"Maybe it was magnesium day who stole it." Lin Yue Jing yelled again, "bad!"

"Well, stop the conspiracy theory." Shen Tinglan turned the wheel, and the car had already driven back to the first hospital. "The diagnosis given by you and the 11th Research Institute is indispensable. Based on the test results, we have locked the fault point on the oxygen turbine pump. In a special environment, the shafting will indeed crack or even fracture. You know, in pursuit of greater thrust and specific impulse, the pressure in the combustion chamber is required to exceed 100 atmospheres. To inject fuel into the chamber, the speed of the turbine and the pressure in the precombustion chamber must be higher. In addition, the low-temperature environment and strong oxidation resistance are added. This turbopump can be said to be one of the difficulties in aerospace engineering. "

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

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

"Oh "The heaviest jewel on the aerospace crown!" he said

However, Li Zheng was extremely unwilling to beat Lin's chair: "so is it really a technological problem in the end Or material science? "

"No, no, no, complaining about technology and materials is the biggest mistake in engineering." Shen Tinglan was not in a hurry to get out of the car. He explained on the spot, "the project is a whole. Our job is to design a rocket that can be successfully launched with our knowledge and mind under the existing technology and conditions. In the face of failure, don't put all the blame on the technology and materials. They are strictly tested when they leave the factory and meet our engineering standards. Of course, in the breakthrough project, we still have the right to ask for higher technology and better materials, but don't put all the responsibility on them. After all, there is no indestructible steel plate in the world. Even if there is, we should not be able to use it. "

"Ah..." Li Zheng thought and sighed, "I am narrow Mr. Shen is right. Cooks should not complain about the ingredients. "

"Cook..." Shen Tinglan was stunned for a moment, then he couldn't help laughing. "It turns out that engineers can be compared to cooks I've learned that, too. "

"Li Zheng's fried fish steak is delicious, not to mention anything else." Lin Qijing may have thought of the food experience, and said good words, "let him do it for you later."

"In two days, I'll treat you to dinner when it's over." Shen Tinglan shook the car key and said, "during this period of time, the No.6 Institute of engineering must pay close attention to the improvement of the engine oxygen pump. We can't be idle and strive to further optimize the overall structure. It's better to further strengthen the vibration suppression."

"Vibration?" Li Zheng asked.

"Ah, you haven't learned this yet. Go upstairs and teach it." Shen Tinglan stretched out, which can be said to be in a good mood. "Most of the time, the rocket runs through the air resistance at super high speed. The vibration generated in this process will affect the operation of every part of the rocket, which can be said to be the first enemy of the rocket. One of our design difficulties is to resist the vibration and better protect the operating environment of each part, Now you know why you want mechanics? ""I see." Li Zheng followed Shen Tinglan to get off the bus excitedly, "it's too empty to call a teacher. I'll call you your teacher's wife directly!"

"Ah..." Shen Tinglan was stunned again, "this..."

"Give me the teacher!" Chen Hongbing suddenly swaggered, "how many times have you said it? Just call mom. What are you doing here?"

This time Shen Tinglan was used to it and didn't run away: "go, leave us alone."

"No, no, no, you have to come." Chen Hongbing waved his hand and said, "we have a summary meeting with the Sixth People's hospital. You have to come."

"Well." Shen Tinglan answered and handed Lin yuejing the key of the office. "Go to my office first, and quietly give Li Zheng the recent learning materials. Study hard and don't fight."

"Oh."

"Yes."

When they left, Chen Hongbing sneered and said, "how can it look like a summer trusteeship class Don't fight? The firewood is burning in your office. Is that a fight? "

"Ah." Shen Tinglan also covered his mouth and quickly took out his mobile phone, "there is a monitor I have to tell them... "

"Well, let's go." Chen Hongbing waved his hand and reached Shen Tinglan's ear and whispered, "don't you wonder what they are doing together? Don't worry. I'll take care of it. I'll accompany you to watch the surveillance later. "

“！” Shen Tinglan was surprised at first, and then retreated, "you don't often watch my office monitoring, do you?"

"I'm free!" Chen Hongbing swearing and waving his hand, "besides, it's also supervision work."

"It's terrible. I'll transfer when the project is over..."

"Oh, no, no, no, I'm kidding."

www.novelhall.com , the fastest update of the webnovel!