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At the celebration banquet, 80% of the scientific research personnel and staff of the entire rocket launch site and ground control center participated. The scene was very lively, and several canteens were full. This scene is reserved for all the scientists and engineers who have made contributions.

Zheng Yaoguang has become a figure of much attention. There are thirteen astronauts who participated in the training with him, but he is the only one who has the courage and guts to ask to participate in this space journey to recover the scrapped satellites without completing the training.

Tang Xiaochuan put down his wine glass and came outside the celebration banquet. The weather was a bit cold, and the wind from the rocket field blew his windbreaker rattling.

"Boss!" Professor Qi's voice came from behind.

Tang Xiaochuan turned around and asked, "Why did the professor come out, why don't you have fun with them?"

"Boss, I'm just a robot, just with higher intelligence. I understand human feelings, but I can't express them!"

Tang Xiaochuan nodded and asked: "The process of returning the manned spacecraft today is too thrilling. I want to know why not put more fuel on the spacecraft? Situations like this may happen again in the future. If there is more fuel What if there is a shortage?"

"Also, I heard that when the rocket is launched, it emits some poisonous gas, which has a great pollution to the surrounding environment, so all the people around should be cleared. Haven't you thought about using cleaner fuel? ?”

Professor Qi said: "Let's talk about rocket propellants first. Most of the rocket propellants used in various countries are conventional propellants, which are mainly liquid oxygen, liquid hydrogen, kerosene and some solid fuels. The injected gas It does cause some pollution to the surrounding environment, but it is insignificant compared with the exhaust fumes emitted by those cars and the thick smoke emitted by factory chimneys!"

"In the next stage, we plan to use liquid hydrogen or solid hydrogen and liquid oxygen as propellants. After all, hydrogen has the highest weight-to-weight energy. Its volume is much larger, but it needs to consume much less oxygen, so it is no problem to use it as propellant for launching rockets!"

Tang Xiaochuan was a little puzzled: "Since liquid hydrogen or solid hydrogen and liquid oxygen can be completely used as propellants, why do other countries not use them when launching rockets, but still add liquid fuels like kerosene and other solid fuels?"

"That's because they don't have the technology to store liquid hydrogen or solid hydrogen and liquid oxygen on a large scale, and the cost of fully using them as combustion agents and oxidizers is also high. Liquid hydrogen and liquid oxygen need to be stored in ultra-low temperature storage tanks, once they exceed the boiling point The liquid can no longer be used as a propellant when it becomes a gas. There are not many liquid hydrogen and liquid oxygen used in rocket propellants in various countries. After all, the technology is not yet fully mature, and they are all injected with liquid hydrogen near the launch time. Oxygen, because the longer the time is dragged on, the harder it is to keep liquid hydrogen and liquid oxygen in a liquid state, and the storage tank cannot be completely sealed. Once sealed, the pressure of the storage tank will increase greatly after the liquid hydrogen is vaporized. With the materials they currently use I can't bear that kind of pressure at all!"

"However, our storage technology on liquid hydrogen and liquid oxygen is fully mature, and we have even stored solid hydrogen at normal temperature and pressure, using fuel cells to provide heat for it, and the solid hydrogen will vaporize after absorbing heat, reaching a controllable level. Completely abandon the use of kerosene-like fuels and other solid fuels, and use only liquid hydrogen or solid hydrogen and liquid oxygen as propellants, which are both clean and high in specific impulse!"

Tang Xiaochuan said: "I read the information that the low density of liquid hydrogen is the biggest shortcoming of it as a recommended propellant. One cubic meter is only about 70 kilograms, and even solid hydrogen is only 86 kilograms per cubic meter. One cubic meter of fuel weighs seven to eight hundred kilograms, and its volume is nearly ten times smaller than that of liquid hydrogen, and it takes up too much fuel storage space on the rocket!"

Professor Qi waved his hand: "This is not a problem. We can increase the number of auxiliary propellers, that is, bundle more propellers around the rocket, and increase fuel tanks! Because we have this technology, the cost is not high, but other countries do not have this. In terms of technology, it is impossible to completely use liquid hydrogen and liquid oxygen as propellants!"

"Let's talk about the fuel storage of manned spacecraft. I just said that liquid hydrogen or solid hydrogen has low density and large volume, so it can only be used as a propellant for ground-launched rockets. If it is used in a manned spacecraft, although technically It is no problem for us, but because of its large size, it is not suitable for manned spacecraft and takes up too much space. Our first manned spacecraft uses a combination of liquid and solid fuel as power. Almost all Satellites, space stations, and spacecraft all use this type of fuel as propellant. Many factors need to be considered. If the fuel is loaded too much, the internal space of the spacecraft will be compressed. Therefore, many considerations must be taken into account when designing, and the fuel to be carried must be Enough to complete the navigation mission, but not too much, too much fuel will take up space for other equipment, so it can only be just right!"

Speaking of this, Professor Qi said: "The thrusters of the manned spacecraft in Meiguo are already using ion engines, and the technology has also made great progress. Its specific impulse is higher than that of any existing fuel. High, but the disadvantage is that the thrust is small, and the high-speed particle flow can only blow a piece of paper. Therefore, this ion engine cannot be used as a propeller for a launch vehicle, and can only be used for manned spacecraft and spacecraft in a vacuum state. Ion engines can achieve a faster speed than chemical fuel propellants, and it is said that the Mei people plan to use this ion thrusters to be installed on manned spacecraft for the voyage to Mars!"

Tang Xiaochuan immediately asked: "Can we develop this ion engine now?"

Professor Qi said with a smile: "Power is one of the most critical factors limiting human interstellar travel. Ion engines can make spacecraft achieve faster speeds than chemical propellants in a vacuum environment because they need to carry less gaseous working fluid. , the engine is small in size and light in weight, so it is also suitable for long-distance sailing, but it can only circle within the sun star, and it takes a long time. It is still impossible to fly out of the galaxy! The reason is that its thrust is too small, Just imagine, how long will it take to accelerate the spacecraft to the speed of light, or even to superluminal speed? Can the spacecraft carry so much energy?"

"For interstellar voyages in the star system, there are two research directions for power research. One is the ion engine. Gravity engine, if progress is made, it can enable the spacecraft to obtain a stronger acceleration, and it can also be used inside the spacecraft, allowing the astronauts to move freely in the spacecraft as on the ground. Navigation, but this development process requires continuous exploration of energy utilization, its advantage is that there are planets nearby, and anti-gravity engines can provide power!"

"And if you want to sail across the galaxy, you need to conduct space technology research. For example, the portal established by the interstellar exploration spacecraft at the Pluto base outside the solar system belongs to space technology. At present, this is only a secondary portal. The teleportation distance is limited!"

After listening, Tang Xiaochuan said: "It seems that the power research direction of this interstellar voyage is mainly based on the anti-gravity engine, but since the Mei people are already working on this ion engine, we can also form a random team to conduct research. The Pluto base Zhongzai’s technology in this area should be decompressed, right?”

"Yes, it can be called at any time. I will form a team as soon as possible to work on the ion engine. The main research and development direction is still on the anti-gravity engine!"

Tang Xiaochuan patted Professor Qi on the shoulder: "That's the decision. Our mission to visit the moon will use a manned spacecraft equipped with an ion engine on the bright side, but we still need to build another one powered by an anti-gravity engine." System manned spaceship!"

Afterwards, he took a special plane to leave the rocket launch site and return to Binhai.

It was already nine o'clock in the evening when he came out of Binhai Airport through the VIP channel. Brother Bing opened the way ahead, but unexpectedly, he was stopped by some reporters.

"Mr. Tang, it is said that the Dongying satellite that Zheng Guangyao crashed into in the synchronous orbit belongs to Dongying Chaoyao Group. I have received reliable news that Chaoyao Group has contacted Feitian Technology Group and demanded that your group pay 200 million dollars in compensation. I don't know Tang What's your opinion on this matter, sir?" A fast-talking female reporter caught Tang Xiaochuan with a microphone and asked loudly.

Tang Xiaochuan turned a deaf ear to this, and walked towards the car parked not far away under the lead of Brother Bing. He was going to go home by helicopter, but the helicopter was undergoing maintenance.

Seeing that Tang Xiaochuan was silent, the other reporters shouted one by one: "Mr. Tang, please tell me, please tell me how your group plans to deal with it?"

"Yes, Mr. Tang, tell me!"

Tang Xiaochuan walked to the car with the door open, stopped and turned around, "I can only say that the Chaoyao Group people are crazy about money. As for how to deal with it, why should Feitian Technology Group deal with it? They want to bark there Just let them bark, can you still bark like them?"

"Crack, crack, crack" several cameras flashed at the same time.

These few words of Tang Xiaochuan made these reporters blushed with excitement as if they had been beaten with chicken blood. These few words revealed too much information, enough for them to let the report of this matter follow Feitian The fact that the technology group's manned spacecraft recovered artificial satellites for live broadcast will compete for tomorrow's headlines, and maybe it will also be able to compete for the hot search list.