A U2 reconnaissance plane roared over the base, making no attempt to conceal its presence.
And on the ground.
Factory 221 is still as usual, making various preparations before the reconnaissance plane arrives:
Beddings were dried in the living area,
A fleet of cargo trucks was lined up in the warehouse.
Thick black smoke emitted from the chimney in the production area.
If you look further away.
You can also see several J-5 fighter jets trying to encircle and suppress U2, but the height difference was easily stretched by U2, and they gave up the interception helplessly.
Everything seems to be a replica of last time.
At this moment.
Master Qian was standing silently by the window just like Zhou Shaoping and others who were hiding in the hidden building.
His eyes were fixed on U2 above his head.
See this situation.
Xu Yun, who was not far away, also sighed slightly in understanding.
indeed.
I would like to ask which self-respecting major country and citizens would tolerate the arbitrary intrusion of their airspace by other countries’ aircraft?
This is like having an arrogant village bully in a certain village.
Usually when he has something to do, he hangs out in front of your house, picks some vegetables and fruits you grow, and occasionally scolds people.
What's outrageous is that when you and your wife were spending the night together, he rushed into your house while chewing an apple, lifted the quilt and looked at the couple with a leering look.
It wasn't until after some discussion that he left humming a tune with his hands behind his back...
Who can tolerate this tmd?
Ni....Only your grandson can bear it!
"...."
A long time passed.
Qian Wushi just recovered his wandering thoughts, returned to the two of them, and poured Xu Yun a cup of tea:
"Comrade Han Li, let's have a sip of tea."
Xu Yun nodded, and Yin Min took the tea cup and fed him to drink - after all, he couldn't hold such heavy objects as the tea cup now.
After a while.
Qian Wushi calmly picked up the pen and began to discuss missile design issues with Xu Yun and Yu Min.
None of the three mentioned the U2 that just passed overhead.
after all......
Instead of speaking harshly at this time, it is better to save your breath and solve the missile design problem.
Then another hour passed.
Chai Zhi and the other three groups returned to the classroom on time.
This is the arrangement that was made when dividing the group. No matter whether the group has produced results or not, they must return to the classroom when the time comes - except for special circumstances where the finishing touch is just the last step.
After everyone is seated.
Master Qian still led Xu Yun to the podium.
He pondered for a moment and then said:
"Comrades, five hours have passed. Now please report the calculation results of your respective groups."
"Shi Jun, let's start with you."
Mentioned before.
After Xu Yun proposed the wasted idea, Qian Wushi divided the entire project team into four groups to conduct derivation.
Except Qian Wushi, Xu Yun, and Yu Min were responsible for supersonic axial symmetry.
There is also the air-breathing propulsion power calculation led by Chai Zhi.
Luo Shijun was responsible for the two-dimensional air intake configuration,
As well as the close cone design of a fixed plane shape taking into account viscosity, led by Wu Beisheng.
Although these three minor items are far less difficult than supersonic axial symmetry, they are all very critical links.
These links generally require CDF or PDF calculations in later generations, but in today's era, they can only be solved manually.
Hearing Master Qian call his name.
Luo Shijun, who was sitting in the second row, stood up immediately, with a trace of restraint on his fair face, and said slowly:
"Old...Director Qian, according to the calculation results of our team, the two-dimensional inlet configuration of the 'Zhuxianjian' missile is much more special than ordinary missiles."
"It requires the missile's side panels to be swept back and the front body to undergo secondary compression, making the missile look like an approximate rectangle as a whole."
"The specific parameters are that the length of the precursor is 23.5 cm, the area shrinkage ratio CR0.94, and the L angle distribution is 12.9°-16.5°..."
When it comes to the concept of air inlets, many people subconsciously think of the application direction first and foremost in fighter jets.
After all, the air intake of the MiG-23 is considered a very representative topic in the aircraft industry, and it will be a lively point of contention even in 2023.
But actually.
The application scope of the air intake duct is still very wide.
For example, a launch vehicle.
Another example is various types of missiles.
99.99% of intercontinental missiles ranging from more than ten meters high to individual missiles measuring tens of centimeters have an air inlet structure.
After all, the purpose of the air intake is to decelerate and pressurize the high-speed airflow and convert the kinetic energy of the airflow into pressure energy.
As the flight speed increases.
The pressurizing effect of the intake duct will become greater and greater.
In an intercontinental missile, the pressurizing effect of the inlet can even greatly exceed that of the compressor...
For the ‘Zhu Xian Sword’ missile.
Its volume itself is very small, and now it needs to increase its altitude, which means that the angle of attack will change from a normal angle of attack to a large angle of attack.
In this situation.
The flow field around the inlet will increase inhomogeneity, so it is very important to handle the configuration of the two-dimensional inlet during the research and development period.
Luo Shijun then reported each parameter.
Qian Wushi quickly drew the corresponding lines on the blackboard just like he had drawn the design drawing before.
five minutes later.
Luo Shijun finished his report.
"...."
Master Qian glanced at the parameters on the blackboard, crossed his arms over his chest, and began to check.
After a while.
He suddenly stretched out his index finger and thumb, marked the length of a vertical line in the middle, and compared it with a horizontal line on the other side.
soon.
Qian Wushi raised his eyebrows and wiped away the parameter of the horizontal line - an L/H ratio of 6.9.
Then he put the chalk into the chalk trough, turned around and said to Luo Shijun:
"Shi Jun, when you calculated the expansion surface ratio, did you use the height of the isolation section of the outer cover as the divisor?"
Luo Shijun was stunned for a moment and replied subconsciously:
"That's right."
Master Qian now showed a hint of excitement, shook his head slightly, and said to Luo Shijun:
This chapter is not finished yet, please click on the next page to continue reading the exciting content! "Shi Jun, you are wrong."
"If you think about it carefully, due to volume issues, the outer cover of our Zhuxianjian missile can only allow the existence of a first-level compression angle."
"So the separation of the lip shock wave must use the non-isolated section as a reference, otherwise the internal channel will be blocked - if you don't believe me, you can use the equation of the blocked state to find a solution. Yes, do it now."
"..."
Luo Shijun looked at the rare serious teacher and had no choice but to do as he was told.
The situation described by Qian Wushi is not complicated, and the results can be easily calculated without the aid of CFD or other tools.
So it's very fast.
A number appeared in front of Luo Shijun:
1.22.
This number is a load ratio. The specific concept is not important. As long as you know that this number is lower than 1, it means that there will be no congestion.
But if it is equal to or greater than 1, it means...
There is blockage in the inner channel.
Once the inner channel of the missile becomes clogged, the flow field in the outer channel will change drastically.
The missile will then...
Think of this.
Swish——
A thin line of cold sweat suddenly broke out on the foreheads of Luo Shijun and other team members.
A few seconds passed.
Gulu——
I saw Luo Shijun swallowing hard, quickly stood up from his seat, and said to Master Qian:
"Director Qian, I have reviewed and found out that our team ignored the first-level compression angle!"
"How about you punish me, deduct wages, report me, or even imprison me? I don't mind!"
"Okay Shijun, you don't have to be so nervous."
Qian Wushi heard this and waved his hand. After pointing out the problem, he seemed to become the kind and good teacher again:
"Recognizing mistakes is a good thing, and there is no need for punishment. If you are criticized because of some calculation problems, who will dare to take on the task in the future?"
"Not to mention you and other comrades, even me, Comrade Yaoping next door, and Lao Guo from the base, who hasn't made similar mistakes?"
"The key is to warn yourself and never make the same mistake again. Don't think too much about other things - the missile design will definitely go through at least one round of review after it lands. It is impossible for the first-level compression angle error to actually appear on the missile.
"
"...."
Hearing what Qian Wushi said.
Luo Shijun murmured at the corner of his mouth a few times, then sat back down silently, looking a little depressed with his head lowered.
See this situation.
Xu Yun on the side was slightly stunned, and a question appeared in his heart:
What is going on?
Of course.
What Xu Yun is confused about is not that Qian Wushi did not punish Luo Shijun, but because...
According to the original history.
This conversation should have taken place fifteen years later.
Mentioned before.
Luo Shijun was the teacher of Yang Wei, the later J-20 chief designer. Mr. Yang Wei once mentioned an embarrassing thing about his teacher in an interview:
It was the late 1970s, when Luo Shijun led a team to solve the convergence problem of nonlinear aerodynamic calculations at large angles of attack.
Among them, Luo Shijun made a wrong calculation in the calculation of aerodynamic angle, and was pointed out by Qian Wushi.
The content of the conversation between the two at that time was similar to the situation above.
Is this pure coincidence?
still.....
Because of the appearance of Xu Yun, the ‘little butterfly’, some ‘parameters’ in the chaotic system have changed?
"...."
Xu Yun then shook his head and temporarily put this idea behind him.
Maybe it's just historical inertia.
Since my little butterfly has no power now, it can't really cause a big storm, right?
Impossible, absolutely impossible!
...........
After Luo Shijun sat back down.
It was the turn of Chai Zhi, the deputy leader of the theoretical group, to stand up and begin to report on the results of their group.
Chai Zhi is responsible for the air-breathing propulsion power calculation process. After all, although the Zhuxianjian missile uses the waverider principle, it is still different from that kind of intercontinental ballistic missile:
Although the missile can also turn vertically to horizontally by drifting in the water, the final sprint is inseparable from the engine.
And since it is an engine.
Then thrust is an issue that must be considered.
Of course.
Without the participation of Xu Yun, it was naturally impossible for Chai Zhi and his team to come up with a scramjet engine with an integrated body-propulsion design.
The engine they developed is still a crankshaft-shaped through-tube propulsion model, and is technically relatively mature.
In addition, Chai Zhi is the oldest and most experienced member of the team except Qian Wushi, and has participated in many key projects.
So it's very fast.
Chai Zhi's report didn't have many problems, and it quickly passed the preliminary evaluation by Qian Wushi and Yu Min.
Immediately afterwards.
Qian Wushi turned his attention to the last person, Wu Beisheng, who was sitting in the corner.
The project Wu Beisheng is responsible for is the close cone design of a fixed plane shape considering viscosity, which is also a very important part of the theoretical link.
Students who have participated in the research and development of DF-17 should all know this.
There are actually many types of waverider models in waverider technology:
For example, a wedge-guided waverider.
As the name of wedge-guided waverider implies, the basic flow field that generates this waverider is a wedge.
The characteristics of this configuration of waverider are obvious. The shock wave is a two-dimensional plane shock wave, and the flow field has high uniformity, which is convenient for parameterized expression and subsequent optimization design.
At the same time, the geometric configuration is simple and easy to design, the aerodynamic parameters are easy to solve, etc. These are its characteristics or advantages.
As for the disadvantage, it requires a three-dimensional reference flow field, which is more difficult.
Another example is the conical waverider.
The conical guide waverider means that the base flow field is a conical shock wave flow field, which can be understood as an ordinary cone with a straight busbar.
Its shortcomings are also that the shock wave configuration is three-dimensional and the uniformity of the compressed air flow is poor.
But the advantage brought by this is that the volumetric ratio of the waverider will be increased.
Other than that.
Waveriders also include blunt cone waveriders, elliptical cone waveriders generated by asymmetric cone-like flow fields, and...
This chapter is not over, please click on the next page to continue reading! Kiss-cut cone waverider.
The snub-cut cone waverider may seem a bit similar to a snake such as the sharp-nosed adder at first glance, but it is actually a waverider designed with close cone theory.
This kind of waverider needs to be designed in a sliced manner, angle by angle, which is very detailed and complicated.
The advantages and disadvantages of this configuration should be the synthesis of the above two-dimensional (wedge) and three-dimensional (cone) waveriders.
That is to say, the uniformity of the flow field in the middle area can be improved, and the volume ratio is also increased.
The disadvantage is, of course, that it is more difficult to design.
all in all.
We have reached this point.
If there is nothing wrong with Wu Beisheng's design and structure.
Then the entire missile design can enter the final demonstration stage, and the actual product can be produced soon.
But if there are errors in Wu Beisheng's design...
Then it's more complicated.
Because theoretically.
Once Wu Beisheng and others fail, it is basically unlikely to be due to calculations, but to the original thinking - that is, the problem with Xu Yun's original thinking.
........
And at the same time Wu Beisheng reported the results of his group.
The main factory office is about one kilometer away from this house.
Lao Guo also hurriedly walked into Li Jue's office:
"Lao Li, what do you want from me?"
"Oh, Lao Guo is here."
Upon seeing this, Li Jue stood up from behind his desk and motioned for Lao Guo to sit down:
"Come on, take a seat first."
After Lao Guo takes his seat.
Li Jue poured him a glass of water, then put the water glass in front of him and asked:
"Lao Guo, how is the Zhuxian project going these days?"
Although Li Jue is the general manager of Base 221 in his official position, the Zhu Xian project is also headed by him on the surface.
However, the organization considered that the "Four Swords" of the Zhu Xian project involved a lot of professional knowledge, and Li Jue, a big boss, was not very good at handling detailed information.
Therefore, the task of dispatching and summarizing the information for the entire project is still left to Lao Guo, who is equivalent to supervising the army.
Lao Guo glanced at Li Jue and knew that this was probably someone from the capital asking about the progress of the project, so he introduced:
"Overall, everything is going smoothly. Among them, the Absolute Immortal Sword Team...that is, the capsule research and development team in charge of Director Liu Youcheng has made the fastest progress. Now there are no more hairy donkeys in the base."
"The second most progressed project is the research on ultra-wideband proximity fuzes that Comrade Sun Junren and his colleagues are responsible for."
"As far as I know, their team's theoretical derivation has been completed, and the physical trial installation may begin tomorrow or the day after tomorrow."
"However, Comrade Wang Yaoping and Comrade Qian Fifth Division may not be so fast - especially Comrade Qian Fifth Division. The research and development of missiles has always been very complicated and difficult."
Hearing what Lao Guo said.
Li Jue nodded thoughtfully.
Then he pondered for a moment and continued to ask:
"Lao Guo, in terms of time, how long will it take for the Zhuxian Platform to be launched?"
"..."
Lao Guo raised his head and glanced at Li Jue. This time he did not give a direct answer, but frowned and asked:
"Lao Li, did something happen again?"
Hearing this, Li Jue tapped his fingers on the table a few times, then motioned to Lao Guo to come closer and whispered a few words:
"Europe...Britain...Gaul..."
As Lao Guo listened, his pupils suddenly shrank.
After a while.
Lao Guo took a deep breath, calmed down the shock in his heart, and said in a deep voice:
"Old Li, judging from the current progress, it will take more than three weeks at the earliest for the Zhuxian Sword to be officially launched." (Pre-judging the comments, some people may say that the update will take three weeks to blow up the plane.
Let me explain in advance, it will explode in the next two days)
"But now that we are in such a situation... I will try my best to mobilize comrades and try to shorten the time."
Li Jue nodded:
"Then thank you for your hard work."
Finished.
Li Jue thought of something again, with a trace of concern in his eyes, and asked Lao Guo:
"Lao Guo, how are your lungs lately?"
"Lungs? It's still the same."
Old Guo Youyou sighed, leaned back on the chair, shook his head and said:
"I have taken a few tablets of tetracycline hydrochloride given by the organization recently, but the effect is just the same. I still have to cough up blood when I should."
"I think there is probably no chance of saving this lung. I can only make some contribution to our country while I am still alive. If I can survive until the day the atomic bomb explodes, I will rest in peace."
Lao Guo and Li Jue have a very good relationship. The two were familiar with each other long before the nuclear weapons project was established.
Therefore, when facing Li Jue, Lao Guo did not hide the fact that he was coughing up blood.
Of course.
If you don’t cover it up, you won’t cover it up.
If Li Jue asked Lao Guo to suspend his scientific research tasks, Lao Guo would not obey anything he said.
"...."
See this situation.
Li Jue was silent for a moment, and instead of comforting Lao Guo, he took out a box from the drawer.
This box is small in size, similar to the ring boxes of later generations. It is made of wood and has a lock on the edge.
Then Li Jue pushed the small box in front of Lao Guo and said:
"Lao Guo, this is something Comrade Qian Wushi brought from the capital, and the recipient is you."
"Its confidentiality level is very high. The organization specifically stated that I must hand it over to you personally. Now you can open it and take a look."
Lao Guo blinked when he heard this, with some surprise on his face:
"Something from the capital? Such a small thing?"
To know.
Not to mention that Lao Guo’s wife Li Pei was currently working as an English teacher in the Foreign Languages Teaching and Research Section of the University of Science and Technology of China in Luzhou and was not in the capital at all.
Just for such a small box to be handed over in such a high-standard way is not normal.
At the same time, theoretically speaking.
It seems that the only things that can be packed into such a small box are...
letter?
Could it be a letter written by a friend from the special front or a leader in the capital?
Think of this.
Lao Guo couldn't help but flip up the lock and opened the lid of the small box.
The result is when you see the situation in the box.
Lao Guo was stunned subconsciously:
I only see this moment.
In this palm-sized box, there is something lying...
Three small white pills.
At the same time, only one of these three tablets was relatively well preserved.
The edges of the remaining two pieces were scorched black, and their volume was so damaged that only about half of them were left. They looked like they had been picked up from a fire.
See this situation.
Lao Guo couldn't help but raise his head and looked at Li Jue:
"Old Li, this is..."
Li Jue immediately shook his head and said:
"Don't ask me, I don't know the specific situation - didn't I say, they have a very high level of confidentiality."
"Bu Liu just called me not long ago and said that this is a special medicine specially sent by the chief to give you. You can take half a pill first and have a look."
"If nothing else... your lung condition should improve temporarily."
Lao Guo:
"?!"
........
Just when Lao Guo swallowed the first pill in a daze.
In the classroom where the project team is located.
Qian Wushi also nodded lightly towards Wu Beisheng:
"Comrade Youxun, thank you for your hard work."
"The design structure of your team is quite excellent, if nothing else..."
"Our group's Immortal Killing Sword will be available soon."
.............
Note:
The kiss-cut cone waverider involves a lot of data, even if I made it up myself, because there is no way to verify whether I made it up or wrote the real parameters (whisper: I really don’t have the ability to get the real parameters)
Yes...), so Wu Beisheng's report was cut in half. This can't be blamed on the review, it's just to avoid suspicion...
