Chapter 1281 Are You Interested in Participating in a Confidential Project?

"Academician Chang..."

Seeing that the other party had already calculated the periodic shape and maintenance energy consumption of the quasi-periodic orbit at point L4, Zhou Pingjian gradually showed a somewhat awkward expression on his face:

"Is this the 'immature idea' you just mentioned?"

If these things were given to him to calculate, he could certainly calculate them.

But to achieve such a level of ease, he must have put in a lot of effort.

It was definitely not a spur-of-the-moment idea.

Chang Haonan glanced down at the A4 paper that had been almost filled up without him noticing, and felt that this description was a bit inappropriate.

"It was indeed immature at the beginning... It was just an idea that came to mind."

He said and threw the pen in his hand aside:

"Later, I took it out to calculate it when I was free, and now it may be a little more perfect..."

"..."

Zhou Pingjian put his hand on his forehead, but finally decided not to dwell on the details of these words:

"In that case, there must be more details?"

As he spoke, he also took out a notebook from his trouser pocket.

But facing this question, Chang Haonan hesitated.

There are more details, of course.

But if "building a space station at the L4 point" can be regarded as part of farsightedness, then the following part is really a bit crazy.

But in the end, he continued:

"According to the current research on the survival status in a microgravity environment, the human body can be in an environment with a gravity level of about 0.3g for a long time without serious problems. So according to my idea, this base should be a circle with a radius of about 300 meters, rotating around the center at a speed. Of course, if you have a better living level, the rotation speed can be appropriately accelerated, and the required rotation radius will be reduced accordingly..."

"The maximum earth shadow time at the L4 point is only 2.4 hours, the moon shadow time can be ignored, and only a small energy consumption is required to maintain orbital stability. Therefore, except for the emergency power system, it can be completely dependent on electricity under normal circumstances. There is no need to transport a large amount of propulsion fluid from the earth. It only needs to provide food and drinking water required for human survival..."

"..."

Obviously, for current human technology, many elements in this idea are not very realistic.

For example, a circular spacecraft with a radius of 300 meters is a huge monster that is hard to imagine.

But Zhou Pingjian did not interrupt Chang Haonan's description, but made special notes after each section.

For example, "mature technology", "still under research" or "need to be verified", etc.

Obviously, he is really considering the feasibility of this plan.

It was not until the minibus drove into the gate of the launch site and stopped slowly that the two people who were talking happily finally reacted and had to stop for the time being.

…

Although the name of this sounding rocket launch site in Qiong Province sounds a bit like the three major satellite launch centers, it is not at the same level in terms of hardware level or administrative level.

The person in charge of the launch site is Xu Pengfei, who is not even a full-time aerospace technician, but the director of the Rocket and Balloon Sounding Technology Research Laboratory of the Chinese Academy of Sciences.

It can be said that before today, most of my life I never thought that I would have such a high level of attention.

"Academician Chang, Chief Engineer Zhou."

Xu Pengfei, who had been waiting for a long time, stepped forward quickly and greeted the two big men who had just got off the car.

Perhaps because he was not well prepared, he seemed quite nervous.

"Comrade Pengfei, don't be too stressed..."

Zhou Pingjian had seen this situation many times, and immediately patted the other party on the shoulder:

"Today I accompanied Academician Chang here, just to learn from you some details of the near-space environment research..."

"..."

Xu Pengfei's confidentiality level is not low, but his business scope has nothing to do with hypersonic research, and today is only a preliminary understanding, so Chang Haonan did not fully state his purpose.

He just said that future manned space research requires physical and chemical factors such as atmospheric structure and aerodynamic conditions within the altitude range of 50-150km, and it may require high-density suborbital launches at low latitudes.

Hearing that such an important project could be related to his unpopular unit, Xu Pengfei couldn't help but feel a sense of pleasure of "a daughter-in-law who has been a daughter-in-law for many years finally became a mother-in-law", and almost laughed out loud in front of everyone.

Fortunately, at the critical moment, reason prevailed.

"Academician Chang, the current launch frequency here is only about 2-3 times per quarter. There is not much to prepare for suborbital launches, so there is still a lot of room for saturation in terms of launch capabilities..."

He led Chang Haonan and others to the slightly simple launch platform and introduced:

"But the existing sounding rockets are mainly used to launch small meteorological detection equipment. In terms of performance trade-offs, they almost completely pursue the launch height without caring about speed, and they are basically uncontrolled or low-controlled launches. I am afraid it is difficult to use them for research on dynamics-related problems."

"You don't have to worry about this aspect."

Chang Haonan waved his hand and said:

"The new rocket-powered flight test platform is already under development. It can fully meet the requirements of large-scale test aircraft, power systems, single aircraft, structures, materials, algorithms, etc. You just need to double the launch mission or even increase it by an order of magnitude."

Xu Pengfei did not interrupt, but just widened his eyes slightly.

Although he had seen a suborbital rocket launched every week or even every 2-3 days when he visited foreign countries before, it was still hard to avoid feeling a little unreal when it came to him.

However, Chang Haonan did not give him much time to prepare his emotions.

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"In addition, your main job, that is, the research in the field of high-level meteorology, cannot be stopped... Because of the special requirements of the project, we need to conduct a relatively complete atmospheric modeling of the adjacent space, especially the altitude above 60km. 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 this altitude range, he quickly realized the focus of Chang Haonan's attention-

The top of the stratosphere and mesosphere divided according to the thermal structure are 50km and 85km respectively, while the top of the mean layer and transition layer divided according to the 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 the adjacent space?"

Chang Haonan glanced at Xu Pengfei who was walking beside him with a look of surprise and approval:

"Director Xu guessed very accurately..."

This is of course the top priority of the next step of research.

In the altitude range, due to the effect of solar radiation, the atoms and molecules in the atmosphere are ionized, generating a large number of free electrons and positive ions. Therefore, the characteristics of the plasma sheath produced by the aircraft at high speed are different from those of the neutral atmosphere at a lower altitude.

Of course, in most cases, since communication is not expected in the black barrier, this subtle difference has little impact.

But whether it is a one-time hypersonic weapon or a reusable hypersonic flight vehicle in the future, if it is to be active in the range of 100km for a long time, it is necessary to ensure the smooth transmission of communication and navigation signals.

The black barrier communication technology he developed for hypersonic missiles is essentially to use the actively ejected ion flow to weaken and modify the plasma sheath wrapped around the outside of the flying body, so that electromagnetic waves of specific bands, specific phases and incident angles can pass 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 and tidied his hair to cover the thin part of his head:

"The coupling problem between the ionosphere and the near-space atmosphere has been a hot topic in recent years, so we have accumulated some relevant data... but the relevant physical mechanism is still unclear, so at present, both at home and abroad, it is still at the stage of empirical estimation."

Here, he paused for a moment, and confirmed that Chang Haonan and Zhou Pingjian's expressions did not change before continuing:

"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 area will disappear, and the ionization characteristics are almost exactly the same as the neutral layer below 60km..."

"..."

An unexpected surprise.

Absolutely an unexpected surprise.

For Chang Haonan, compared with the unprepossessing Director Xu Pengfei himself, the other gains of this trip seem less important.

"Director Xu."

Chang Haonan suddenly stopped and turned to the other party with a serious face:

"I have a confidential project here...it may take a long time. I wonder if you have the conditions and willingness to participate?"