"Looking purely at the melting point, hafnium alloy, graphite, diamond, tungsten and other materials can indeed exceed 3000 degrees, but they are either too expensive and rare, or they are not qualified for the special tasks of the engine due to their plasticity, brittleness and other reasons..."

"So, I can't think of a material that can be used in aerospace engines on a large scale and can withstand a high temperature of 3,000 degrees..."

When Zhu Mingyue heard the last part, he started to chirp unconsciously.

"The basics of chemistry and materials science are also pretty good."

"Ah..." Li Zheng waved his hand modestly, "I just participated in a few small competitions... I can't even think of such a material..."

"It's right that you can't think of it, and I can't think of it either." Zhu Mingyue said with a smile, "This kind of perfect material only exists in theory. The total amount of materials on the earth may not be able to build a rocket. We use it on a large scale.

Most of the alloys have operating temperatures within 1,500 degrees, mainly due to the cooling achieved by special coatings and propellant flow."

"But on turbine pump blades, these technologies are greatly limited."

"In short, this part cannot be cooled down at this stage, and the upper temperature limit of the pre-combustion chamber is only 1,300 degrees."

"But the temperature at which liquid hydrogen and liquid oxygen can fully burn is 3,000 degrees."

"what to do?"

Lin Yujing, who had been silent all this time, suddenly became excited: "Insufficient burning... excessive burning?"

"Yes, we inject excessive hydrogen or oxygen into the pre-combustion chamber to create incomplete combustion and control the internal temperature within 1,300 degrees." Zhu Mingyue turned his head again and was sucked to Lin Yujing's side, "Then The question comes again, is it too much hydrogen or too much oxygen?"

"It must be hydrogen." Lin Yujing nodded vigorously, "High-temperature pure oxygen will cause severe oxidation and corrosion. Who can withstand this?"

"Very, very good." Zhu Mingyue wanted to applaud, "If you didn't come up with it all by yourself without the guidance of Commander Shen, I really have never seen such a brain like yours..."

Before he finished speaking, he quickly said to Li Zheng: "Well... you are also very smart, you don't mean anything else..."

"It's okay, let's continue..." Li Zheng looked extremely calm, "I'm used to it."

The same goes for Lin Yujing, and so does Gui Jianfeng...

Li Zheng has long been used to facing this kind of inhuman brain circuitry...

"Okay, let's continue." Zhu Mingyue cleared his throat and said, "After excessive combustion of hydrogen, exhaust gas will inevitably be produced, so we need to set up an exhaust system..."

"In the first reset of the fault model, the problem was the exhaust system."

"To put it simply, the exhaust port is broken, causing the air flow to be blocked."

"In a short period of time, the airflow that drives the turbopump suddenly decreases sharply, and it becomes impossible to inject fuel into the combustion chamber."

"Combustion stops quickly and the engine shuts down."

"This is a complete reproduction of the fault."

"Such a failure has never occurred before in more than 30,000 seconds of testing."

"We believe that Huang Er encountered a special resonance in an extreme environment during the launch process, which caused the exhaust system failure."

"This exhaust design is time-tested and has never been done before."

"At the time, we thought it was just bad luck and the boat capsized in the gutter."

"After identifying the fault point, we raced against time to strengthen the entire exhaust system so that it could withstand harsher conditions than in the recurrence of the fault, and then sent the new version of the engine to the test site with confidence."

"In the first two regular tests, the engine still performed excellently."

"You have also seen the results of the third extreme environment test run."

"There is no abnormality in the strengthened exhaust system, but the shaft system is broken."

"The shaft system is the core of the core. A break here is ten times more serious and ten times more complicated than an exhaust failure. I'm afraid it can't be solved by tinkering. Many people believe that the process of finding and repairing the fault is It's even longer and more arduous than redesigning an engine."

"To use an inappropriate metaphor, we initially found a small leak in the dam and then blocked it with cement pouring."

"The next day, the entire dam collapsed."

"It turns out that what we blocked was not a leak, but an ant nest."

"The embankment of a thousand miles has long been penetrated densely by ant nests."

"That's the seriousness of the problem at this stage."

At the end of the sentence, Zhu Mingyue nodded solemnly.

"Therefore, I personally have no objection to the establishment of the 927 project."

"When Chief Engineer Zhang and Academician Zhang fall down, I have the responsibility to take over."

"But based on my experience, such serious flaws are difficult to solve in a short period of time. In order not to affect the country's subsequent aerospace strategy, 927 is also a painful choice for the leaders, a choice without choice."

"However, this does not affect our determination to go all out."

"Know that you can't do it, but do it."

"Know that it is difficult and try your best to do it."

"Since its establishment, the Seventeenth Institute has been moving forward with a heavy load."

Zhu Mingyue stood up and raised his right arm.

"Li Zheng, Lin Yujing."

"Welcome to join China Aerospace Power Research Institute."

Li Zheng held hands with Zhu Mingyue and shook them vigorously: "Do it! Try your best to do it!"

Lin Yujing was much calmer when shaking hands, and asked thoughtfully: "There is one thing I can't figure out..."

Zhu Mingyue nodded with interest: "Please tell me."

"Why must it be exhausted?" Lin Yujing frowned and rubbed her chin in a dignified manner, "The so-called exhaust gas in the pre-combustion chamber still contains a large amount of excess hydrogen. Why should it be wasted? It is not good to inject it into the combustion chamber.

Is that so? Wouldn’t the overall fuel utilization rate of the rocket be higher?”

Zhu Mingyue stared when he heard this: "Your mother really didn't tell you?"

"without……"

"Then maybe you can really take over her job in a few years..." Zhu Mingyue nodded repeatedly and explained, "Of course the design you mentioned exists, and it is the optimal design, our YF-100 kerosene engine

This design is adopted, which not only achieves full combustion, but also doubles the air pressure in the combustion chamber. But specifically for the hydrogen-oxygen engine, it has higher requirements on structure, parts, pumps and materials. We cannot challenge the highest level of difficulty from the beginning.

So a gas generator cycle is used that requires exhaust.”

"Well..." Lin Yujing breathed a long sigh of relief, "This is smooth..."

"Originally, I didn't understand that Secretary Zhao was bragging you so much... Now I completely accept it." Zhu Mingyue pursed his lips and nodded repeatedly, "You are 18 years old, my God... After so many years of education, the education system can be regarded as cultivating

You are such a person."

Zhu Mingyue just finished speaking and quickly turned to Li Zheng: "Of course there are people like you...it's you, I made a mistake..."

"It's okay, I'm used to it, I'm used to it..."

"Okay, given your level, we won't go to the test team." Zhu Mingyue then made arrangements, "A temporary fault investigation team will be set up soon, and someone who is definitely qualified to be your teacher will serve as the team leader. You can directly

Follow him."

Just as he was talking, there was a unique and intensive knock on the door behind him.

Dong dong, dong dong dong, dong dong dong dong dong, dong dong dong dong dong dong dong…

Li Zheng still had some impression of this knock on the door. It was a sequence of prime numbers.

However, his expression froze, and he had a bad feeling.

"Come in." Zhu Mingyue said.

Immediately, a handsome face came in: "I've been waiting for a long time, can I join the queue?"

Zhu Mingyue was immediately overjoyed and rushed over to greet them. He took the old handsome man's hand and said to the two of them: "This is Chief Engineer Du Songtao, a top expert that NASA is clamoring for. Qiuzhi-1 and other rockets are impatient to wait."

, specially asked for support from our Seventeenth Institute, and from now on, you will follow him."

"ah……"

"Well……"

Li Zheng and Lin Yujing were originally happy.

It's going to be bad all of a sudden.

It feels like a spore man spy infiltrating human beings, like "Parasite" or something.

Du Songtao was quite happy, however. When he entered the room, he got himself a glass of water. He walked up to the two of them leisurely, drank the water and raised his eyebrows: "Isn't this a coincidence."

What a coincidence, this is obviously a conspiracy of the spore people!

Seeing the intense hostility between the two, Zhu Mingyue asked, "Do you know each other?"

"Not familiar."

"Not familiar..."

"It will be easier if we know each other." Zhu Mingyue said, "Then you two go out and wait while I explain a few things to Songtao."

The two of them lowered their heads and left the office.

Then they bumped into the long-haired brother who was in front of them.
Chapter completed!