The same hot material can be developed in the isotope pool where the satellite parts rapidly dissipate heat.

After discussing Zhang Liu for a long time, I talked about this launch.
"Academician Wang, I still don’t know. There is another device for this launch." Speaking of this, Zhang Liu is somewhat awkward and depressed.
"Ha ha ….." Academician Zhang Peicai was embarrassed.
Zhang Liu’s resentment is mainly due to the fact that there were two "passengers" in the launch of the Chang 11 rocket.
One is the Practice 12 satellite, and the other passenger is the outpost 1 experimental satellite.
This outpost 1 experimental satellite is actually a Queqiao relay satellite test. Because the long 11 synchronous orbit load reaches about 75 tons, the practice of satellite 12 has about one-third of the effective payload, and the space agency intends to fully benefit.
So there was the outpost 1 experimental satellite.
After hearing this, Huang Xiuyuan also looked stupid and forced the older generation of scientists to do things in pursuit of reality and cost performance.
It seems to them that there are still about 5 tons of synchronous orbital load 11 years long, and if it is not fully profitable, it will be a waste of time.
Looking through the phase inversion data, he found that the design of the experimental satellite of outpost 1 was also very simple and rude.
Because there is too much surplus of effective charge, Academician Zhang Peicai’s plan is to turn effective charge into core secondary.
That is to say, the rocket body of Chang-11 is composed of three parts: core-1 solid fuel, core-2 liquid fuel+outpost-1 experimental satellite, and core-3 Shijian-12 satellite.
Because the specific impulse of N2 solid fuel is as high as about 6, the primary power of the base core is enough to send 75 tons of the secondary and tertiary cores to the scheduled orbit.
If all goes well, there is still about 1~15% fuel surplus enough for the core-level surplus fuel to forcibly return to the blue star atmosphere.
Even if Huang Xiuyuan agrees with the idea of cost-effective development, he can’t help but wake up and say, "Is it a bit much for Academician Zhang and Academician Wang to launch projects this time?"
"Don’t worry, let’s prioritize." Academician Wang Kan is confident.
Academician Zhang Peicai explained that "the core level is enough to ensure that practice 12 is in place, but even if the recovery test of outpost 1 and core level is unsuccessful, we will not lose too much"
"Well," Huang Xiuyuan couldn’t help it. After all, the rockets were assembled and announced at the time of launch, and the launch would not be cancelled unless there was force majeure.
Huang Xiuyuan was not too concerned about this launch, and it was just a coincidence that he came here.
He was invited here mainly for another purpose.
Due to the recent rapid development of science and technology, especially materials science, the level of China’s materials field has been abruptly raised to a big stage.
The aerospace field has very high requirements for materials. Academician Zhang Peicai and others have encountered many problems in new projects, and invited Huang Xiuyuan to come and hope to give some solutions or ideas.
Zhang Peicai led a group of people to another assembly car next door when they got out of the Long 11 Rocket General Assembly Car.
There is also a rocket on display here, which is 11 times larger than the volume.
Chapter two hundred and nine Fatal temperature
This rocket is half-finished. Huang Xiuyuan visually estimated that it was completed by about one third.
Academician Wang Kan introduced him to some information about this rocket. "Xiu Yuan, this is a newly designed 12-long rocket. The prototype was finalized in February this year, but we encountered many problems during the construction process."
"Long 12?"
I heard Huang Xiuyuan’s tone wondering that Wang Kan took a document from the side and handed it to me. "These are some specific parameters."
Huang Xiuyuan took a look and found that the design index of this new solid fuel rocket was alarmingly high.
The overall weight reaches 24 tons, the near-earth orbit payload is about 42 tons, the synchronous orbit payload is about 214 tons and the lunar orbit payload is about 175 tons.
Perhaps compared with the giant bully, Saturn V is 12 long and its payload is about 4% of the other side.
However, if we compare the charge ratios of the two, we will find that Saturn V’s near-earth orbit charge ratio is about 3.
In the future, the payload of Falcon heavy rocket in near-earth orbit is about 63 tons, and the charge ratio is about 449.
It can be seen that the design level of China’s national transport rocket needs to be further strengthened. The Falcon heavy-duty transport rocket with hydrogen and oxygen engine can raise the load ratio to 449, which is indeed a very remarkable technology.
If Chang 12 can be further optimized by adding N2 high-energy fuel base, it is not impossible to raise the charge ratio in low earth orbit to 6.
After all, the specific impulse of N2 high-energy fuel is about 6, while that of hydrogen-oxygen engine is about 45.
Theoretically, the charge ratio of N2 high-energy fuel rocket should be about 191 times that of hydrogen-oxygen engine, that is, around 57.
However, Huang Xiuyuan can’t guarantee anything theoretically.
At present, the charge ratio of 52 has been refreshed, and the engine material, the overall design of the rocket and the control system need to be further improved.
Zhang Peicai explained some problems in the design and manufacture of Chang 12.
"The main problem now is that the engine is not heat-resistant, and there is also the problem of solid fuel combustion control."
"heat resistance?" Huang Xiuyuan turned to the part of the engine and found that the Chang 12 engine was made of cermet materials specially developed by aerospace science and technology, which can withstand high temperatures of 3~4 degrees Celsius.
However, such a high-temperature resistant cermet can’t withstand the engine combustion temperature, which really makes a group of experts in the Aerospace Research Institute feel unprepared.
At present, due to the very high energy density of N2 material, the engine tail flame temperature has reached a terrible level of 5472 degrees Celsius.
Huang Xiuyuan asked a key question, "How can the Chang 11 engine solve this problem?"
"We adopted your company’s silicon nano-coating and tungsten nano-powder …" Zhang Peicai explained.
After listening to the solution, Huang Xiuyuan knew that they were like a solution.
Their engine wall was coated with a layer of silicon nano-coating technology, and then a layer of tungsten nano-coating was deposited by centrifugal deposition. This repeated operation made a total of 142 composite coatings.
Although the silicon nano-layer and the tungsten nano-layer can withstand the extreme high temperature of 474 degrees Celsius, the tungsten-silicon nano-composite layer has a very good characteristic, that is, high-temperature detachment.
When the ambient temperature exceeds 53 degrees Celsius, the tungsten-silicon composite layer will gradually liquefy and be ejected from the engine by the engine tail flame. In this process, part of the heat in the engine part will be taken away to delay the heat transfer and accumulation of the high temperature to the engine substrate.
In this way, it is ensured that the engine will not be burned through the arrow body during the flight of the rocket.
However, this method brings two disadvantages. One is that the weight of the engine has increased by 12 tons. After all, the weight of tungsten metal is very pitted. Another problem is that it can’t be solved from the root when the temporary solution can be delayed.
Huang Xiuyuan let go of the document "that is to say, because the design index of length 12 is more than three times that of length 11, it is difficult for the engine to withstand the working temperature for a long time?"
Zhang Peicai’s stall hand "is that if the tungsten-silicon layer in the engine part is increased, the weight of the engine will be further increased and the engine part is limited, so it is impossible to limit the superposition of the tungsten-silicon layer."
In the face of this deadly temperature, it is relatively easy to handle rockets in low-earth orbit and medium orbit, such as Chang 11.
However, Chang-12 design is mainly used in future lunar exploration projects and fire exploration projects, which need to be in operation for a long time. If it is changed to liquid fuel, it will not be worth the candle.
Patted his cheek, Huang Xiuyuan stared at the head not far away, and the arrow was lost in thought. There are indeed many high-temperature resistant materials in the future.
The problem is that those materials or manufacturing technology can’t be done at present; Either rare elements need to be abnormally high; Either the laboratory conceptual root production can’t be invested on a large scale.
Material problem theory is a headache in any era.
The high energy density of N2 fuel is a double-edged sword, which brings high-density energy as well as explosive power and ultra-high temperature.
After a while, Huang Xiuyuan woke up from thinking. "I need to think about it when I need it."
"Xiu Yuan didn’t have us for the time being, and sometimes I asked Guanghua to arrange the dormitory conditions for you. Forgive me." Zhang Peicai didn’t mean much.
If Huang Xiuyuan comes, this big problem can be solved immediately, and thousands of people in the whole space port will be completely prostrated.