Chapter 1279 Goal: Breakthrough Near Space
At the same time, China.
Due to the particularity of the space fishing boat plan, the Second Artillery Force responsible for the launch mission itself had already evacuated Qiong Province after it was confirmed that the satellite had been successfully put into orbit.
Only Chang Haonan and his technical staff, as well as the administrative staff responsible for logistics work, were left to continue to follow up on the situation.
Of course, it's all over now, so they have nothing to follow up on.
In fact, according to the original plan, as early as last night, the frontline personnel should have withdrawn from Qiong Province to the capital in batches.
However, Chang Haonan specifically asked to stay one more day to meet Liu Mengyuan, the person in charge of the sounding rocket launch site.
Zhou Pingjian also stayed with him on the grounds of "inspecting the location of a low-latitude rocket launch site."
"That's right, Old Zhou."
On the way to the launch site, Chang Haonan suddenly asked:
"As I said before, let you sort out the expenses of the entire project..."
Before he could finish asking, Zhou Pingjian quickly replied:
"Before setting off this morning, I called specifically to ask. They said that everything has been sorted out and should have been posted to the official website of the space agency by now..."
Chang Haonan nodded:
"Including the research and development funds for Kuaizhou-1 and the costs of the previous two ground tests, have they all been paid in?"
"We directly list the costs of each link in the launch mission, and then change the symbol in front of the amount from RMB to US dollars to announce it."
Zhou Pingjian chuckled:
"With a simple calculation, not only the research and development funds for Kuaizhou-1 and modular satellites, but also the costs of the Shenzhou-7 and Tiangong-1 missions can be covered..."
Chang Haonan said in his heart that you are the more evil-hearted.
During the arms sales process, the CNY symbol was directly replaced by the USD symbol. He had always heard it as a joke.
I didn’t expect that I would really be in a hurry now.
And guess what?
NASA has to thank us!
"Speak of it, Academician Chang."
After a while, Zhou Pingjian looked at the launch site that was vaguely visible in the distance, and suddenly felt a little curious in his heart:
"Although this launch site in Qiong Province also has the word "rocket" in its name, in the past nearly thirty years, the largest things launched were the Peace 2 with a take-off weight of 331kg and the Zhinu 3 with a take-off weight of 285kg. At most, ten A detector weighing several kilograms is sent to a place about a hundred kilometers high, which is not even considered suborbital..."
"And even if the country builds a new space launch site in Qiong Province in the future, it will definitely choose a place close to the coastline where a large port can be built directly. Why do you suddenly think of going to inspect the situation there?"
Chang Haonan answered almost without thinking:
"Because my next step is to study the dynamics of rarefied gases..."
This reason was obviously completely beyond Zhou Pingjian's expectations.
So much so that he was stunned for a while before finally reacting:
"Theoretical research?"
"Well... not entirely."
Chang Haonan organized the language:
"In the final analysis, it is still for the subsequent hypersonic weapon project, but if some theoretical issues related to thin gas can be solved in this process, it will also be helpful to the hypersonic aircraft itself." Zhou Pingjian looked a little puzzled:
"But I heard that a JF14 ultra-high-speed wind tunnel has already been built in Miyun, where the mechanics department is located?"
Chang Haonan lowered his head and thought for a moment, then shook his head gently:
"In the beginning, I was indeed planning to rely on the JF14 wind tunnel to complete all preliminary verification tests. However, during the period when I was responsible for the space fishing boat project, I communicated with comrades from the Aerospace Science and Industry many times and found that the altitude range is 50-150km. The flight situation in near space is much more complicated than expected.”
"The current JF14 wind tunnel can only restore high speeds and high total temperatures. It is sufficient for studying hypersonic aircraft that generally operate at altitudes below 40km in the atmosphere, but for transatmospheric aircraft that fly at higher altitudes, Many key theoretical elements are still missing..."
What he said was very calm, but to the ears of Zhou Pingjian opposite, it was almost like a thunder:
"Trans...transatmospheric vehicle?"
Chang Haonan was stunned by this somewhat startled reaction, and soon realized that the other party might have been thinking too much.
"I'm not talking about amphibious vehicles...at least not yet."
He quickly explained:
“From a classification perspective, any vehicle that operates at a near-space altitude for a relatively long time, including a fully gliding hypersonic vehicle that uses rocket boost as its initial power, or even a space shuttle, is considered a type of transatmospheric vehicle.”< br>
After hearing this, Zhou Pingjian finally breathed a sigh of relief.
It seems that in a short period of time, the function of the traditional rocket + spaceship combination is still the only one, and it will not be suddenly replaced by something tinkered with by the amazing academician Chang in front of me.
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In fact, for him, research related to near space is not completely unfamiliar.
When China first planned its manned spaceflight project, someone proposed a space shuttle plan that was more complex but also had greater carrying capacity and mission flexibility.
The reason why it was later denied by Mr. Qian was that in addition to the outrageous cost, an important technical factor is that the space shuttle needs to operate for a longer period of time in the 50-150km altitude range than the spacecraft, and even needs to maintain a certain level of energy during the process. mobility, and at that time, China, or the entire human race, had a very limited understanding of nearby space.
"So, Academician Chang, are you planning to use this place as a scientific research base to conduct a series of scaled-down adjacent space flight tests?"
"This is my initial idea."
Chang Haonan replied:
"You should know that Qian Lao proposed as early as 1946 that the optimal flight altitude of long-range taxiing aircraft is about 96 kilometers, and the flow is divided into continuous flow, slip flow, transition flow and free molecules according to the Knudsen number Stream.”
"In the high-altitude, thin environment near space, the mean free path of molecules coming from a hypersonic aircraft increases significantly. For the macroscopic reference scale for studying the overall aerodynamic characteristics of the aircraft, the flow around the aircraft already meets the transition flow standard, so the object surface velocity Slip, temperature jump and Knudsen layer formation make the traditional continuous flow calculation method completely inaccurate in predicting the aerodynamic characteristics of the aircraft..."
It is almost impossible for aerospace personnel of Zhou Pingjian’s generation not to have read Mr. Qian Xuesen’s monographs and papers.
Although it has been a long time, the latter can still recall many of the details:
"But I remember... the Knudsen number proposed by Mr. Qian is just a conceptual qualitative division. Systems such as near-space slippage and transitional flow around aircraft basically have multi-scale flow characteristics. They often have local rarefaction effects and cannot be simply defined. For completely continuous flow or transitional flow? ”
The fact that the other party could remember the key points so quickly was indeed beyond Chang Haonan's expectations.
"That's right...so I'm going to take a step further based on Mr. Qian."
He replied solemnly.
Zhou Pingjian looked shocked and opened his mouth but did not speak.
After a brief silence, Chang Haonan himself continued:
“When the Knudsen number approaches 0, the gas can be directly assumed to be a continuum medium and can be solved directly using the N-S equation just like in the atmosphere. If the Knudsen number is greater than 10, then the collisions between molecules can be ignored. , only need to consider the collision between molecules and object surfaces, which are relatively easy to solve..."
"But when the Knudsen number is in the range from 0.01 to 10, the problem can only be solved by numerically or analytically solving the Boltzmann equation..."
"And...this is also the most unified way to solve the problem of rarefied gas flow!"
(End of chapter)