Following Weng Yunzong, the two of them came to a conference room.

A large screen fell, and a picture of the design was posted on it.

This is the design drawing of the "aerospace engine" created by the Institute of Aerospace Research on the electromagnetic propulsion system.

Xu Chuan took the control pen from Weng Yunzong and carefully flipped through the design drawings on the screen.

Pictures passed through my eyes. Judging from the design drawings, the aerospace engine designed by the Aerospace Research Institute looks like a word "天".

The narrow and long pipe in the middle is composed of two parts: an electromagnetic acceleration field and a compressed gas chamber made of improved superconductor materials. It is shaped like a cone without a pointed point connecting a narrow and long cylinder.

The narrow and long acceleration field is composed of internal magnetic coils, magnetic poles, discharge chambers, propellant delivery tubes, and yin and yang gas distribution chambers.

Its main purpose is to electrolyze the air working fluid absorbed by the compressed gas chamber into plasma, and then increase the speed through a strong magnetic spiral acceleration field, thereby providing huge thrust to the engine.

The compressed gas chamber is located at the top of the narrow and long cylinder. It can absorb a large amount of air through a special absorption device and provide it with other suspended objects, dust and other impurities in the air, and provide pure air working fluid to the acceleration field.

These two parts are the middle area of ​​the character. In terms of design, it runs through the fuselage of the space shuttle, from the nose to the tail, providing main power for the space shuttle.

The other two shorter pipelines are small propulsion devices deployed on the wings of the space shuttle. They are similar to the main engine, but they actively perform auxiliary power adjustment, steering and other aspects.

Judging from the design drawings, researchers at the Aerospace Research Institute have considered all aspects of work.

Of course, this released design drawing is not all the details, nor can it be all the details.

After all, it is impossible for a design drawing of an aerospace engine to be only a few dozen pictures, and adding two zeros is not enough.

The early design drawings of aerospace engines were really made by truck drawings. Not to mention the rest, the F119 engine used on the F22/F35 alone had tens of thousands of parts, which was enough to show that the complexity of the aerospace engine was not something that ordinary enterprises or even countries could play with.

In fact, countries around the world that have the ability to design aerospace engines independently may only count twice.

.........

After simply and seriously looking through the design drawings of the aerospace engine, Xu Chuan thought for a while with interest, looked up at Weng Yunzong and spoke:

"I don't know much about the details and design of the aerospace engine, but I have a few questions I want to ask."

"Academician Xu, you said."

"The first question is the shielding of magnetic fields, have you considered it?" After thinking for a while, Xu Chuan asked: "During the operation of this aerospace engine, whether it is an improved superconductor or related permanent magnet structure, it will generate an extremely huge magnetic field, which will affect some precision instruments, many related equipment, and personnel on the space shuttle."

"Especially from the design drawings, the engine you designed is almost enough to cover the bottom layer of the entire aerospace engine, so its impact will be greater."

Weng Yunzong nodded and replied, "I have considered it."

After a pause, he continued: "About the magnetic field shielding of aerospace engines, it is mainly carried out through two methods: magnetic shielding layer and metal shielding efficiency."

"In the design of aerospace engine, the entire engine system is located at the bottom of the space shuttle, which will be separated from the middle layer of the small controlled nuclear fusion reactor and fuel chamber and the personnel carrying space on the upper layer. The separation layer will use extremely efficient shielding materials to make a protective cover to avoid mutual influence."

"Although this will increase the weight of a lot of space shuttles, there is currently no other way to perfectly solve the impact of the magnetic field."

"After all, you know very well how powerful the magnetic field formed by improved superconductor materials is."

Xu Chuan nodded and said, "Well, what about these shielding magnetic fields and the heat dissipation of the space shuttle itself? Are thermal radiation enough?"

When hearing this question, most people think that cooling in outer space is not easy? There is a vacuum of minus 270 degrees below the outside. Isn’t it easy to dissipate heat under such cold conditions?

But in fact it is not.

Junior high school textbooks tell us that the main methods of heat transfer are heat conduction, heat convection and heat radiation.

Compared with these three heat transfer methods, the heat transfer efficiency of heat conduction and heat convection is usually higher, while the heat radiation efficiency is lower, and the heat dissipation process is slower.

For example, the double-layer vacuum thermos or thermos bottles used in daily life are equivalent to cutting off the hot water and dissipating heat through heat conduction (of course, the actual situation is still impossible to be completely isolated), so the insulation time becomes very long.

Under normal circumstances, space can be regarded as a vacuum environment. In this environment, without conventional substances such as air, soil, water, etc. as conductors, it cannot exchange energy with the outside world through heat conduction and heat convection, and can only be achieved through thermal radiation.

However, the heat radiation dissipates heat very slowly and the efficiency is very low.

The interaction between the magnetic field and the shielding material, and the space shuttle will generate a large amount of heat when it is in operation. If this heat is not transferred, it will greatly affect the safety of the space shuttle.

Therefore, heat dissipation is a major issue in the space shuttle.

When Weng Yunzong heard about this conventional problem, he didn't think much about it. He just thought that this person might not know much about aerospace. He nodded and said:

"The heat dissipation aspects are things that must be considered in space. Considering that the heat radiation is slow, the space shuttle has problems such as continuous heat generation, such as the operation of a large number of equipment in the space shuttle, which is constantly generating heat. The current approach is to cool the equipment by adding a large number of heat sinks to radiate energy outward."

"At the same time, referring to the configuration of the space station and the space shuttle in the United States, heat is transferred through the coolant circulation system."

Xu Chuan shook his head and said, "I think it is difficult to solve the problem of heat transfer and dissipation of the magnetic field shielding layer and the space shuttle itself."

"If the heat generation value of conventional space stations and space shuttles is one, then for space shuttles that use small controlled nuclear fusion reactors, the heat generation value may not be less than ten."

"Neither the heat generated during cooling the outer field coil or the heat shielded magnetically is probably not so easy to solve."

Upon hearing this, Weng Yunzong frowned.

For vacuum heat dissipation, there are actually no good other methods for radiation, except to improve the material and to increase the specific surface area of ​​the emission.

The frequency of blackbody radiation (complete thermal radiation) is only related to temperature, while different materials affect only the reflection and refraction of electromagnetic waves by objects. Overall, the radiation frequency is only related to temperature.

The International Space Station is a similar solution, which solves radiation and heat dissipation solutions through the stack area.

And the key is that the temperature of the heat sink cannot be increased too high. After all, the larger the temperature difference between the two heat reservoirs of the refrigerator, the lower the efficiency of the refrigerator, so in fact, the temperature of the heat sink will not be much higher than the heat source temperature.

If the heat sink cannot solve this problem, it will be a big problem.

The Institute of Aerospace Research has considered the issue Xu Chuan mentioned, but did not expect that this method would be far from enough.

After thinking for a while, Weng Yunzong looked up at Xu Chuan, frowned and said, "If this is the case, in addition to improving the material and increasing the specific surface area of ​​the radiated emissions by changing methods, and improving the thermal radiation efficiency, only a part of the weight of the working fluid is added to evaporate phase change and heat dissipation."

"But in this case, increasing the working fluid will increase the weight of the space, and overall it will be a little more cost-effective."

The weight of the space shuttle cannot be increased at will, and the thrust of the aerospace engine is the main reason for the limitation.

Moreover, for every portion of weight, one portion of engine thrust needs to be added, but also one portion of fuel or working fluid needs to be added.

In this way, the additional fuel and working fluid account for another weight.

Just like the strongest launch vehicle system in history developed by the United States, Saturn 5, its first-stage rocket has a total thrust of up to 3,400 tons, but in fact, it can only send up at most 100 tons of materials to low-Earth orbit.

The remaining thrust of more than 3,300 tons is all used to consume self-weight.

Therefore, the weight of the space shuttle and the impact of every change in design are huge.

More importantly, they don’t know how much thrust the aerospace engine is.

Although theoretically, an aerospace engine with improved superconducting materials and spiral tracks increased the acceleration field length can reach the 100 KN level, in fact, how much is it can only be known after the first test.

In this case, every time a heat dissipation work fluid is added, the requirements for engine thrust will be one point higher, and the conditions will be extremely demanding.

Thinking about it, Weng Yunzong looked at Xu Chuan and asked tentatively: "Academician Xu, do you have any ideas here?"

Although the question was raised, he honestly didn't think this person could have any good ideas about aerospace cooling.

After all, cross-track is like cross-border, the aerospace field and the controlled nuclear fusion field are two completely different fields. If you ask tentatively, it is just a casual nature.

Moreover, spacecraft cooling in outer space vacuum environments is a huge problem that the whole world is worried about.

World-oriented and capable of pushing satellites or space stations to the sky, all need to face this great trouble.

But what he didn't expect was that the man nodded unexpectedly and said that he really had a way to solve the problem.

After taking a look in surprise, Weng Yunzong said curiously: "What do you say?"

Xu Chuan smiled, picked up the control pen on the table, and flipped the design drawing of the aerospace engine on the screen onto the structure.

"I have calculated roughly before. If the space shuttle that uses aerospace engines and miniaturized controlled nuclear fusion technology is used to dissipate heat with the current thermal radiation efficiency, at least two space shuttle cooling plates with surface area are required to dissipate heat."

"But this is obviously unrealistic, we can't carry so many heat sinks on the sky with us."

“Then it is necessary to find a new way to dissipate heat.”

"Thinking of the special vacuum environment in space, apart from thermal radiation, there are not many methods that can be used."

"What you just said is that evaporation phase change and heat dissipation is a feasible means by increasing part of the weight of the working fluid, but it will lead to an increase in the weight of the space shuttle, which has a great impact on all aspects."

"But if you want to solve the heat dissipation problem, you still have to rely on the heat dissipation work fluid to solve it..."

Hearing this, Weng Yunzong looked at Xu Chuan with some confusion, and he wanted to solve the heat dissipation through working fluid, but he did not want to increase the spacecraft's self-weight. How to do this?

Noticed his eyes, Xu Chuan smiled and pointed to the design drawing of the aerospace engine on the screen and continued: "So I need you to modify the design of the aerospace engine and add an evaporative phase change heat dissipation device to these two positions."

Looking at the position Xu Chuan pointed out, Weng Yunzong's eyes fell into the pipelines of the aerospace working fluid storage and acceleration field.

After staring at the design drawing for a while, his pupils suddenly contracted, he couldn't help swallowing, took a deep breath and spoke, "What do you mean is to solve the problem of heat dissipation through the original aerospace working fluid?"

Xu Chuan nodded with a smile and said, "That's right."

"The additional increase in heat dissipation fluid will not only compress the space on the shuttle, but will also put a huge burden on the shuttle and aerospace engines."

"But unlike traditional Hall propulsion units and space stations and other equipment, the aerospace engine uses the working fluid, which performs additional acceleration through the magnetic field and does not care what the working fluid is."

"In this case, we can transfer the circulating heat inside the space shuttle through the coolant circulation system by pre-storing liquid ultra-low temperature working fluid, release it on the space work fluid, then transfer it to the aerospace engine, and then discharge it to outer space."

On the side, Weng Yunzong's eyes became brighter and more admirable. He followed Xu Chuan's words and continued to say: "And the working fluid in ultra-low temperature is preheated before entering the acceleration field, which can also reduce the consumption of electricity by some aerospace engines..."

Xu Chuan smiled and shook his head: "This part of the savings is nothing. The key point is that it is enough to solve the internal heat of the space shuttle in this way."

"Theoretically, this method is OK, but in fact, the amount of heat transfer and energy consumption of aerospace working fluids requires you to conduct specific experiments."

After a pause, he added: "And not only do you need to conduct experimental test data, but you also need to test which conventional aerospace fluid can take away more heat."

Weng Yunzong nodded quickly and said, "This is no problem. We don't need to wait for the aerospace engine to be manufactured. We can do this now."

The experiment of simulating the thermal bearing of the working fluid in the space environment tests the thermal bearing degree, although the experimental environment requires a high level of demand.

But this is the top Xinghai Research Institute in China, and it is easy to create an ultra-low temperature vacuum environment.

Xu Chuan smiled and said, "Then I'll leave it to you."

.........
Chapter completed!