Chapter 559: Hang yourself with a hook, don’t change for a hundred years!
"."
inside the house.
Hearing what Qian Wushi said.
The scene was quiet for a while.
Immediately afterwards there were waves of low-pitched discussions.
Mentioned earlier.
The 'Zhuxian Sword Formation' plan designed by Xu Yun actually has only two main structures:
Airships, and launch platforms carried by airships.
Or to be more precise, it should be.
Airships, and missiles on launch platforms.
After all, the initial kinetic energy of the missile is provided by gravitational potential energy, which is the standard free fall mode.
This design is to save the fuel of the missile and allow more propellant to be used in the deflection direction, thereby freeing up space to accommodate the fuze.
The second is that if the missile is changed from [falling] to [launching], then the process technology will obviously be much more complicated.
It is even possible that the tail flame is too high and directly burns the airship - then what falls down will not just be a missile.
Therefore, the most important task of the so-called launch platform is to carry missiles to the sky, and the technical content is relatively low.
But missiles are different.
Let’s take the simplest example.
The principle Xu Yun came up with this time uses ultra-wideband proximity fuze technology, which is considered a brand-new technology.
However, if this theory is to be put into practice, it mainly relies on gas rudder or airfoil control.
These two gadgets are relatively not that “new”.
The so-called gas rudder.
It refers to installing the rudder surface on the rear side of the tail nozzle to change the direction of the jet and allow the missile to turn.
It has a similar principle to another type called moving nozzle, with relatively high rudder efficiency and rapid steering.
What about wing control?
It relies on the air rudder to change the airflow to generate deflection torque.
Its rudder efficiency is relatively low, but it is simple and reliable, and can work continuously and stably.
Of course.
This refers to the technologies that are capable of being experimented with at this time.
If the era were changed to 2023, there would be many options.
For example, engine nozzle vector control technology or side thrust, etc., are not listed here for the time being.
Whether it is gas rudder or wing control, they all need to take into account the size of the missile:
How long is the missile?
What's the width?
What is the leading edge radius?
Not to mention that the length of the missile will directly affect wind resistance and other data, which is the basis of everything.
So before all steps.
The team must determine one of the most critical parameters:
The length of the missile.
Although Xu Yun set the tone from the beginning of the design that the longest length would not exceed two meters, there is still a lot of variability within two meters.
After all, there are too many types of missiles.
As everyone knows.
The definition of a missile is a weapon that relies on its own power unit to propel itself, is guided by a guidance system, controls its flight trajectory, and guides the warhead to destroy the target. It is a precision-guided weapon.
Due to differences in structure and volume,
Missiles are divided into many categories:
Such as ballistic missiles and winged missiles. That is, cruise missiles.
A ballistic missile is a missile that flies along a preset trajectory and delivers its warhead to a predetermined target.
According to the nature of combat.
Ballistic missiles can be divided into two types: strategic ballistic missiles and tactical ballistic missiles.
Strategic ballistic missiles are generally medium-range, long-range and intercontinental ballistic missiles.
Tactical ballistic missiles are generally short-range ballistic missiles.
However, even the smallest short-range ballistic missiles are basically more than eight meters in length.
For example, the length of Dongfeng 11 from Rabbits is 9.75 meters.
And what about winged missiles.
It is an autonomous aircraft powered by a rocket engine or an air-breathing engine. The normal force required for maneuvering flight is provided by the aerodynamic force of the lift component and equipped with a warhead.
Surface-to-air missiles, air-to-air missiles, surface-to-surface missiles, air-to-surface missiles, anti-ship missiles and anti-tank missiles, which are known to everyone in later generations, are all types of winged missiles.
For example, the codename of the rabbits' anti-ground missiles is Long Sword, which is CJ.
The codename of the anti-ship type is YJ, which has also been complained about by countless military fans
The air-to-air missile is codenamed PL,
The surface-to-air missile is codenamed Hongqi HQ,
The sea-based ones are called sea red flags
At the same time, it is directly proportional to the number of categories.
Winged missiles also vary in length.
For example, the length of a long sword is up to 10 meters.
Hongqi 16 is only 5.7 meters.
The thunderbolt is only over three meters.
In 2023.
The rabbits even developed a miniature missile called QN202, which is only 52 centimeters long and as mini as a cucumber.
Of course.
Even in 2023, missiles within two meters are not particularly common.
Because the shorter size means less warhead and propellant, the power and range will be shortened accordingly.
However, the Zhuxian Platform currently has gravitational potential energy to provide kinetic energy, so there is no problem in shortening the volume.
"."
After a while.
A middle-aged man with a round face in the audience, whose complexion was much sallower than ordinary people, raised his hand and said:
"Director Qian, what do you think of 1.83 meters?"
Although Xu Yun did not recognize this person's identity at first, after Master Qian introduced him, he knew that this middle-aged man was the famous Mr. Wu Beisheng.
Brackets, youth version or youth version pro - after all, I am thirty.
"1.83 meters?"
Master Qian touched his chin when he heard this and fell into deep thought.
What Wu Beisheng calls 1.83 meters is not a number that pops up just by thinking about it.
This number is actually familiar to all members of the theory team present.
It is exactly the missile designed by the missile project team when planning the future blueprint after the successful launch of Dongfeng-1 last year.
This missile, codenamed MA-302GQ, has a preset length of 1.83 meters and a combat radius of about 40 kilometers.
This is a third-generation or even fourth-generation missile that may be produced fifty or sixty years later. It is equivalent to the product of future generations' brainstorming.
But even with the blueprint plan, Qian Wushi and the others still calculated some important parameters.
Think of this.
Master Qian picked up his pen and did a simple calculation on the calculation paper.
After a while.
Master Qian shook his head slightly and denied:
"No, the altitude is calculated as 30,000 meters, the air pressure is 0.016Pa, and the atmospheric temperature is 224.65K."
"In this scenario, the MA-302GQ cannot stay at high altitude for too long. The convergence curve is easily unbalanced, and accidents are more likely to occur."
Hear this.
Xu Yun on the side also nodded slightly.
Mentioned earlier.
The search radius of the weather Doppler radar is about 500 kilometers around the base, and the U2's sailing speed is about 600-700 kilometers per hour.
That is to say, normally.
Weather Doppler radar can only determine the flight path of U2 within 40 minutes.
And in accordance with the standards of later generations of aviation associations.
The ascending speed of the airship is about 5 meters per second, which is about 300 meters per minute, and will not exceed 400 meters at most.
In other words.
In 40 minutes, the airship can only rise more than 10,000 meters at most - this is still the most ideal state.
Not to mention the subsequent alignment correction via radio, which also takes a lot of time.
Therefore, we want the airship to fly to an altitude of 30,000 meters in the stratosphere and debug it in good condition.
The base must immediately launch the airship platform into the air as soon as it receives notification from the shore-based radar.
That is to say, regardless of the time it takes to rise, the duration of the entire platform will not be less than two hours in any case.
Therefore, the high-altitude conditions that the missile may encounter during the airborne phase are also a link that Qian Wushi and others must consider.
Think of this.
Master Qian stood up again, drew a horizontal line at the top of the blackboard next to him, and wrote down a few parameters:
Air pressure:
0.016Pa.
Atmospheric temperature:
224.65K.
Angle of attack:
0°.
Spin body flow field:
Axisymmetric horn vortex type horseshoe vortex.
Waverider mesh quality:
0.9+.
Finish writing these.
Qian Wushi drew a simple airplane icon on the lower right side of the horizontal line and wrote the speed of U2 and other words.
Then he patted the chalk dust on his hands and said to everyone in the audience:
"Everyone, let's use this simple diagram as a reference."
"These are the main parameters at an altitude of 30,000 meters. Everyone started to calculate and figure out the structure of the projectile that can stay in this environment for two hours, no, four hours."
"Then we will use this structure to screen and see if we can find suitable examples among the existing design plans."
"If there is no ready-made solution sample, we will redesign a new missile. Do you have any opinions?"
Everyone in the audience quickly gave a neat answer:
"No!"
Upon seeing this, Master Qian nodded with satisfaction:
"Then let's get started."
Say it.
Master Qian first drew a vortex on the blackboard, wrote an elliptical equation, and said:
"First, we still consider the simplification of the perturbation potential flow equation."
"There is almost only horizontal wind in the stratosphere, so the equation can be simplified into a hyperbolic equation"
As everyone knows.
The spiral body is a basic shape of rockets, missiles and aircraft bodies.
Although its geometry is simple, its separation flow structure is complex and exhibits some unique three-dimensional flow phenomena.
The composition of the spiral body of later missiles has developed to the fourth generation, and there is basically no need to consider the impact of the stratospheric state on the deformation of the spiral body.
But today's domestic missiles are still in the early stages of development, and are still relatively primitive alloy steel-based metal matrix composite materials.
Therefore, the influence of the spiral body flow field on the missile spiral body is very critical.
soon.
Qian Wushi simplified it into a particularly simple expression:
mdVdt=PcosαcosβXmgsinθmVdθdt=P(sinαcosγV+cosαsinβsinγV)+YcosγVZsinγVmgcosθmVcosθdψVdt.
sinβ=cosθ[cosγsin(ψψV)+sinsinγcos(ψψV)]sinθcossinγ
sinα=cosθ[sincosγcos(ψψV)sinγcos(ψψV)]sinθcoscosγcosβ
sinγV=cosαsinβsinsinαsinβcosγcos+cosβsinγcoscosθ.
That's right.
The smart classmates must have figured it out.
Qian Wushi re-created a longitudinal symmetry plane in the ballistic coordinate system.
That is, with the center of mass O of the projectile as the origin, the vertical plane containing the velocity vector.
The angle between the velocity vector and Ox1 is the angle of attack.
That is the so-called
Angle of attack.
But after writing this.
Qian Wushi did not continue the deduction.
Instead, after a short pause, he turned his thoughts to the center of mass and wrote another equation:
dx/dt=VcosθcosψVdydt=Vsinθ.
See this situation.
Xu Yun couldn't help but raise his eyebrows.
He could still see the derivation related to fluid mechanics and mathematical fields.
Then quickly.
He realized something and his heart suddenly sank.
Could it be because of that reason
"."
More than twenty minutes later.
Master Qian just put down the chalk in his hand.
At this moment.
The two blackboards in front of him were filled with a lot of formulas.
A high-intensity derivation process coupled with a hot and dry environment without air conditioning.
So after Qian Wushi finished writing these contents.
His thin white shirt was completely soaked with sweat, and it clung tightly to his chest, like a water man.
After a while.
Master Qian wiped the sweat from his forehead and said to everyone in the audience:
"Okay, comrades, the formula has been simplified."
"Now the members of the theory group are divided into three groups in pairs, and each group is matched with comrades from the three-digit calculation group to start dividing the work and calculations."
Everyone in the audience quickly responded:
"Understood!"
Later, including Luo Shijun and others.
The six members of the theory team quickly found their partners and began to work in groups to make calculations:
"I'm missing a comrade here. Does anyone know more about aerodynamics?"
"Any comrade here, thank you!"
"Which comrade is more proficient in derivatives? What, you don't have a girlfriend, comrade? Then it's you!"
Master Qian slowly sat down in his seat, picked up the enamel teacup and took a sip of water.
Then he glanced at Xu Yun, raised his chin towards the outside of the house, and said:
"Comrade Han Li, we have nothing to do now, why don't we go out and have a chat?"
Xu Yun has no opinion:
"Okay."
So Master Qian pushed Xu Yun out of the door and took a walk in the garden.
"Comrade Han Li."
After the two of them had walked about seven or eight meters, Master Qian suddenly stopped and asked Xu Yun:
"You should have noticed it just now, right?"
Xu Yun was silent for a long time this time, and then replied:
".Well, if I read it correctly"
"What you wanted to write just now should be the subsequent equations of waverider technology?"
"."
Upon hearing this, Master Qian took out a long breath, put his hands behind his back, and said with emotion:
"Yes, you have a good vision, it is the equation of the waverider."
"Theoretically, the way the airflow turning angle δ is handled in the waverider concept can perfectly optimize the projectile material and even the subsequent falling problem."
"After all, if a 30,000-meter projectile freely falls to a certain speed, it will definitely meet the supersonic speed scenario."
"It's just a pity, we can't do it now"
Xu Yun was also silent.
In fact, he noticed it just now.
There was an obvious pause when Qian Wushi wrote about the longitudinal symmetry plane, and then he suddenly turned his thoughts to the study of the center of mass.
How to say it
This conversion is not particularly far-fetched, but it is very "violent".
So from that time Xu Yun realized that Qian Wushi's original idea was actually a wave-riding body.
Waverider technology.
This theory was first proposed in the 1940s, and the proposer was Qian Wushi himself.
At the same time, this theory is not like the Karman-Qian approximation formula, where outsiders or even foreigners are involved in the whole process.
The waverider technology was completely established by Qian Wushi from beginning to end.
It can be seen literally.
The so-called wave-riding body refers to a technology that rides on ‘waves’.
So what kind of wave is this wave?
The answer is shock waves.
Students who were shock waves in their previous lives should know this.
Shock wave is a very strong disturbance wave.
At the shock wave.
The air will experience a sudden increase in pressure, temperature and density from before the shock wave to after the shock wave.
At the same time, the air speed will decrease.
Generally speaking.
Shock waves are common in supersonic aircraft, explosions, bullet shooting, etc., and can be directly observed using a schlieren.
Shock waves can be divided into normal shock waves and oblique shock waves according to their characteristics.
Among them, the normal shock wave is easy to understand.
Give an example.
Suppose there is an infinitely long cylinder in which the air is at rest.
at the same time.
The cylinder contains a piston.
When the piston starts to accelerate to the right from rest.
The gas on the right side of the piston will generate disturbance waves in turn and propagate to the right.
When the piston continues to accelerate.
Since the speed of the subsequent wave is greater than that of the previous wave, the subsequent wave will definitely catch up with the previous wave.
When numerous disturbance waves are superimposed to form a vertical compression wave, a normal shock wave is formed.
Oblique shock waves refer to when a cone moves at supersonic speed. Since its speed exceeds the speed of sound, the disturbances emitted from the object will superimpose to form a wave front.
This wave front is an oblique shock wave.
The concept of waverider is the idea of using shock wave pressure to improve the lift-to-drag ratio of the aircraft in the aerodynamic shape design of hypersonic aircraft.
The flat upper surface allows air to pass smoothly without generating shock waves.
The spikes on the lower surface form shock waves.
Because the gas is compressed from before the shock wave to after the shock wave, the pressure after the shock wave is greater.
In this way, the shock wave below provides lift for the aircraft and improves the lift-to-drag ratio of the aircraft.
Because it obtains lift by "riding" on the shock waves generated by its own flight, it is named "wave rider".
The trajectory of this kind of warhead is as erratic as the update time of a certain author, and there is no way to intercept and snipe in the process.
Qian Wushi proposed the waverider technology very early, but unfortunately when it was actually realized, Mr. Qian was no longer here:
It was not until 9 years and 11 months after Qian Lao passed away.
The hypersonic waverider missile Dongfeng 17, which was officially unveiled at the 2019 military parade, truly brought Qian Lao's theory into reality.
So at this moment.
Mr. Qian probably doesn’t have much confidence in his own technical concept.
During the selection of people who moved China, Mr. Qian’s comment once moved countless people:
[Five years to return home, ten years to complete].
But actually.
Master Qian's contribution was more than just ten years?
Until more than ten years after his death, he was still protecting the country he loved.
After a while.
Mr. Qian suddenly took a deep breath and asked Xu Yun:
"Comrade Han Li, do you think I will see the emergence of waverider warheads in my lifetime?"
Xu Yun was startled when he heard this, then nodded seriously:
"Director Qian, don't worry, you will definitely see that day."
joke.
Although he doesn't know much about missile design.
But with so much technology already available, how could the Rabbits not develop a waverider warhead before Master Qian died?
If nothing else,
The industrial software and computer technology he mentioned to Sun Junren and Qian Bingqiong alone were enough to shorten the process a lot.
Brush——
Hearing Xu Yun's words.
Master Qian suddenly turned his head to look at Xu Yun and asked in surprise:
"Comrade Han Li, are you telling the truth? Can I really see that day?"
"I'm telling you, I've read a lot, and I was a professor at Caltech. I can't be fooled easily."
Xu Yun nodded seriously again:
"Of course it's true. Maybe we are the first country in the world to master waverider warheads."
"Oh?"
Qian Wushi's breathing stagnated slightly, and an inexplicable look suddenly burst out in his eyes.
Snap——
I saw him slap Xu Yun on the shoulder, and when Xu Yun grinned in pain, he laughed loudly, and the original fatigue of the whole person disappeared instantly:
"Okay! Comrade Han Li, then I, an old man, will believe you just once!"
"If our country can really be the first to master the waverider missile, then I will die with no regrets!"
Master Qian looked as excited as a child.
While Xu Yun was rubbing his shoulders, he felt a surge of emotion in his heart.
Mr. Qian, are the rabbits of future generations more than just the first to master waverider missiles?
After the 2019 military parade.
With the emergence of the DF17 waverider warhead, the entire world's nuclear deterrence pattern has changed - this is not a joke, but a real thing.
Although Mao Mao's dagger was claimed to have been intercepted not long ago, many Kuomintang-haters started pretending to spray daggers, but actually started spraying DF17.
But not to mention that the dagger uses a water-floating bomb with a double-cone warhead, which is technically similar to the DF-15B and the older sea-facing Pershing 2.
These people are too lazy to just check the authenticity of the news - according to the information compiled by all parties, Da Mao should have fired two daggers.
One of them hit a love 3 defense system, and the remaining one probably vaporized hexahydrogen
His eyes returned to reality.
Just when Xu Yun was feeling emotional.
The Fifth Master Qian on the side thought for a moment and suddenly stretched out his little finger towards Xu Yun:
"Comrade Han Li, come on."
A question mark appeared in Xu Yun's eyes:
"?"
Qian Wushi glanced sideways at Xu Yun and pretended to snort:
"Why, have you ever tried hanging yourself with a hook?"
"We have agreed that if I don't see the waverider warhead appear before I leave, I will settle the score with you, little comrade."
"."
He looked at Master Qian who looked childish but serious.
Xu Yun opened his mouth slightly subconsciously, as if he wanted to say something.
But in the end he didn't speak.
After a while.
He silently raised his little thumb and gave Qian Wushi a very funny but not funny hook:
"Hook hook~hanging~no change allowed for a hundred years"
Finish these.
Qian Wushi just let go of his hand with satisfaction.
I saw him humming an unknown tune happily at first, then suddenly thought of something, turned to Xu Yun and asked:
"By the way, Comrade Han Li, if I want to see the waverider warhead right now, are you capable of doing it?"
Xu Yun:
"???????"
Then he didn't wait for Xu Yun to answer.
Qian Wushi laughed alone, shook his head and said:
"Hahaha, Comrade Han Li, don't be too nervous, I'm just kidding."
"With our current level, it is simply wishful thinking to come up with a waverider warhead. Even a missile with a similar principle is impossible - I still have this point."
"If someone can come up with a plan with similar principles now, old man, I dare to take the Maxwell that was given to him by Lao Guo's mentor von Kármán and was snatched away by Ye Duzheng before Comrade Sun Junren had finished chewing half of it. Grab the used ax and chew it!”
Xu Yun:
"."
After a while.
Qian Wushi looked at the watch in his hand that the leader had given him back then, his expression straightened, and he said to Xu Yun:
"Okay, Comrade Han Li, it's almost time, we should go back."
"If nothing else, Ronaldinho and the others should have figured out the structure of the missile - even if they haven't estimated it, they will be close."
Xu Yun had no objection.
So Teacher Qian pushed Xu Yun's wheelchair back to the classroom.
Sure enough.
After Qian Wushi re-entered the classroom.
Luo Shijun, the leader of the theory group, immediately stood up and said to Master Qian:
"Teacher, the missile structure that meets the conditions has been calculated, but"
Qian Wushi glanced at him:
"But what?"
"."
Luo Shijun was silent for a moment and said:
"But."
"If it is designed according to the corresponding parameters, there should be some problems with its power link."
Say it.
Luo Shijun left his position and walked to Master Qian with a document:
"Teacher, look at this." Note:
Thanks to book friend 33021211001677 for the reward!
(End of chapter)