Chapter 1281: Are you interested in participating in a confidential project?
"Academician Chang..."
Seeing that the other party had even calculated the periodic shape of the quasi-periodic orbit at point L4 and the energy consumption to maintain it, Zhou Pingjian gradually showed some difficulty on his face. Tense expression:
"Is this the 'immature idea' you just said?"
If you leave these things to him, of course he can calculate them.
But to achieve this level of ease, it must have taken a lot of effort.
It is definitely not a temporary idea.
Chang Haonan lowered his head and glanced at the A4 paper that had been almost filled with writing before he knew it, and felt that this description was a bit inappropriate.
"It was really immature at the beginning... It was just an idea that I had inadvertently"
He threw the pen aside as he said:
"Later, when I had nothing to do, I took it out and did some calculations. Now it may be a little better..."
"..."
Zhou Pingjian put his hand on his forehead, but in the end he decided not to To get entangled in the minutiae of wording:
"In this case, there must be more details, right?"
While speaking, he also took out a notebook from his pants pocket.
But faced with this problem, Chang Haonan hesitated.
Of course there are more details.
But if the matter of "building a space station at point L4" itself can be regarded as part of myopia, then the following part is really a bit fanciful.
But in the end, he continued:
“According to current research on survival conditions in microgravity environments, the human body can be in an environment with a gravity level of about 0.3g for a long time without serious symptoms. problem, so according to my idea, this A base should be a ring with a radius of about 300 meters, constantly rotating around the center at a speed of 0.95r/min. Of course, if you have a better survival level, then the rotation speed can be appropriately accelerated, and the required rotation radius will also be reduced accordingly... …”
"The maximum earth shadow time at point L4 is only 2.4 hours. The moon shadow time is negligible, and only a small amount of energy is required to maintain orbit stability. Therefore, except for the emergency power system, under normal circumstances, it can completely rely on electricity to operate without any need. Transporting a large amount of propellant from the earth only needs to provide the food and drinking water needed for human survival..."
"..."
Obviously, with the current human technology, this idea is Many elements are not yet realistic.
For example, a donut-shaped spacecraft with a radius of 300 meters itself is an unimaginable behemoth.
But Zhou Pingjian did not interrupt Chang Haonan's description, but only made special notes after each section.
For example, "mature technology", "still under research" or "needs verification", etc.
Obviously they are really considering the feasibility of this plan.
It wasn't until the minibus drove into the gate of the launch site and swayed to a stop that the two people who were chatting happily finally realized that they had to stop temporarily.
......
Although the name of this sounding rocket launch site in Qiong Province sounds a bit similar to the three major satellite launch centers, it is not at the same level in terms of hardware level and administrative level.
The person in charge of the launch site is named Xu Pengfei. He is not even a full-time aerospace technician, but is the director of the Rocket and Balloon Sounding Technology Research Office of the Chinese Academy of Sciences.
It can be said that before today, for most of my life, I never thought that I would get such a high level of attention.
"Academician Chang, Chief Master Zhou."
Xu Pengfei, who had been waiting for a long time, quickly stepped forward and greeted the two big guys who had just got off the car.
Perhaps because of insufficient preparation, the whole person seemed quite nervous.
"Comrade Pengfei, don't be too stressed..."
Zhou Pingjian has seen this situation many times, and immediately patted the other party on the shoulder:
"I accompanied Academician Chang here today. , I just want to know some details about near space environment research. Details..."
"..."
Xu Pengfei's confidentiality level is not low, but his business scope has nothing to do with hypersonic research, and today we only have a preliminary understanding, so so Chang Haonan did not fully clarify his purpose of coming. It just means that future manned spaceflight research needs to study physical and chemical factors such as atmospheric structure and aerodynamic conditions within the altitude range of 50-150km, and may require high-density suborbital launch clouds at low latitudes.
Hearing that such an important project could be related to his own unpopular unit, Xu Pengfei could not help but feel the pleasure of "having become a mother-in-law after many years of marriage", and almost laughed out loud in front of everyone.
Fortunately, at the critical moment, reason prevailed.
“Academician Chang, our current launch frequency here is only about 2-3 times per quarter. There are not many things to prepare for suborbital launches, so in terms of launch capability, there is still a long way to go before saturation. The space..."
While leading Chang Haonan and others to the slightly crude launch pad, he introduced:
"However, the existing sounding rockets are mainly used to launch small meteorological detection equipment. In terms of performance trade-offs, they almost completely pursue high launch regardless of speed, and they are basically uncontrolled or low-controlled launches. I am afraid it is difficult to be used for power. Study related issues.”
“You don’t have to worry about this issue.”
Chang Haonan waved his hand and said:
“The new rocket-powered flight test platform is already under development. Functionally, it can fully meet the load-carrying tests of large-scale test aircraft, power systems, stand-alone aircraft, structures, materials, algorithms, etc. As long as your launch site is ready for launch Just double the task and even increase your preparation by an order of magnitude."
Xu Pengfei didn't interrupt, but just widened his eyes slightly.
Although he had indeed seen a suborbital rocket being launched every week or even every 2-3 days during his previous inspections abroad, but now that it was his turn, he still felt a little unreal.
However, Chang Haonan did not give him much time to brew his emotions.
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“In addition, your own work, that is, the research in the field of upper-level meteorology cannot stop...Due to the special requirements of the project, we need to conduct a relatively complete survey of the adjacent space, especially at altitudes above 60km. Atmospheric modeling, this is also one of your key tasks in the second half of the year..."
"Above 60km..."
Xu Pengfei's main business is actually meteorological research, so after hearing about this altitude range, he quickly realized the focus of Chang Haonan -
The top of the stratosphere and mesosphere divided according to the thermal structure are respectively 50km and 85km, while the tops of the mean layer and transition layer divided according to component characteristics are 85km and 100km respectively.
Only the dividing line between the neutral layer and the ionosphere is around 60km.
“You want to study the ionization characteristics of the atmosphere in nearby space?”
Chang Haonan glanced at Xu Pengfei walking beside him with surprise and approval:
"Director Xu's guess is very accurate..."
This is of course the top priority for the next step of research.
In the altitude range of 60km-150km, due to the action of solar radiation, atoms and molecules in the atmosphere are ionized, producing a large number of free electrons and positive ions. The characteristics of the plasma sheath generated by the aircraft flying at high speed are also due to this. It is different from the neutral layer atmosphere at lower altitudes.
Of course, in most cases, since communication in a black barrier is not expected, this subtle difference has little impact.
But whether it is a one-time hypersonic weapon or a hypersonic vehicle that can be reused in the future, if you want to operate in an area near 100km for a long time, you must ensure the smooth communication and navigation signals. transmission.
The black barrier communication technology he previously developed for hypersonic missiles essentially uses the actively ejected ion flow to weaken and modify the plasma sheath wrapped around the outside of the flying body, thereby allowing specific wavelength bands and specific The phase and angle of incidence of electromagnetic waves are transmitted through the shielding layer.
Therefore it is highly dependent on the understanding of the ionization characteristics of the atmospheric environment.
Xu Pengfei was a little embarrassed to trim his hair, covering the thinning part of his head:
“The coupling problem between the ionosphere and the nearby space atmosphere has been a hot research topic in recent years. So we have also accumulated some relevant data...but The relevant physical mechanism is not yet clear, so at present, both at home and abroad, it is still at the stage of empirical estimation."
At this point, he paused for a moment and confirmed that the expressions of Chang Haonan and Zhou Pingjian were all the same. After nothing changed, he continued:
"However... if you are not going to study the air ionization process itself, but want to solve the ionization problem, or solve other problems through ionization, then you can arrange the test at night... because we found that after about midnight , the extra electron density in the D region will disappear, and the ionization characteristics are almost exactly the same as those of the neutral layer below 60km..."
"..."
Unexpected surprise.
An absolute surprise.
For Chang Haonan, other gains from this trip seemed less important than the unattractive Director Xu Pengfei himself.
"Director Xu."
Chang Haonan suddenly stopped and turned to the other party with a serious face:
"I have a confidential project here...it may last a long time, I don't know about you Do you have the conditions and willingness to participate? ”
(End of this chapter)