Chapter 582: There is no way to carve Longxia’s neck
All the newcomers were shocked beyond measure!
No matter how hard they thought about it, they never imagined that the person in front of them who looked younger than them, the proud ones, was actually Teacher Su, who was talked about by many top military experts!
At this moment, they wanted to question it, but the top military industry experts all spoke of Chief Master Su. The shouts of Teacher Su showed everyone the true identity of the young man standing on the podium and giving lectures to everyone.
This is the legendary Chief Master Su who is said to be so miraculous!
Even after the first lesson, their heads were still buzzing, as if they had been hit hard.
This fact gave them a huge blow.
Many of them are undergraduates, masters and doctoral students, and many of them are even recommended students. They can be said to be the true pride of heaven, top scientific and technological talents.
I originally thought that after entering here, they could still regard themselves as geniuses, be able to easily perform the work here, and even be able to achieve results easily.
It wasn't until they were assigned to the names of various military industry experts and began to be exposed to scientific research projects in the base that they realized how arrogant they were, and their self-confidence was greatly affected.
Later, they felt that the legendary Chief Master Su was an elderly and kind old man anyway, so that it fit everyone's imagination and made them feel more comfortable.
They even thought of the words to comfort themselves. Even if they couldn't compare to each other academically, they were better because they were young. With their intelligence, they might be able to win when they reached the age of 'Chief Master Su'. They are also experts at the level of a leader.
But who would have thought that the so-called kind old man was just a figment of their imagination and did not appear.
The man standing on the podium was a little too young. Even if they dared to squeeze out anyone, he would be older than Chief Master Su.
This directly broke their defense, because in front of Chief Master Su, almost all the things they were proud of were not worth mentioning.
Regardless of their age, experience, or knowledge, they all lost completely and lost all their pride.
This is what I call a serious dragon among men, a true pride of heaven!
At the base, they had heard from the grassroots engineers that Chief Su was a figure highly respected by the chiefs of the three armies and treated as a treasure.
And what do they have?
Su Dingping didn't have the time to care about the thoughts of the newcomers below, nor did he have the leisure and leisure to care about those things.
After talking about the cannon issue, Su Dingping then corrected many military experts' misconceptions about the follow-up scientific research direction of fighter aircraft before officially entering the next lecture session.
"The topic of today's lecture is about wind tunnel technology."
"Today, you will discuss how we can build our own complete third-generation wind tunnel center with completely independent intellectual property rights, as well as a series of problems encountered by the engine during wind tunnel testing."
When the top experts present heard this, their eyes widened in shock, and their ears stretched out like rabbit ears.
Since the White Bear Tribe unilaterally broke the agreement some time ago and forcibly removed the wind tunnel equipment, the Air Force's related research and development has entered a stage of stagnation, leaving them very helpless.
As a result, the Air Force had to allocate part of its strength to deal with manufacturing issues related to wind tunnel test equipment, and at the same time, it also had the strength to overcome engine manufacturing issues.
If the two are done together, the Air Force will not have that strength, and it will not be able to produce it even if it takes a few more years.
No matter what it is, it is extremely difficult for the Air Force. It is not an exaggeration to say that it is difficult to reach the sky.
But now Su Dingping actually directly talks about technical issues related to wind tunnels in class, and even introduces the third-generation wind tunnel.
So confident?
Could it be said that the wind tunnel has been completed? Is it true or false?
As a result, some experts stood up excitedly and asked directly: "Chief Engineer Su, have we finished all the third-generation domestic wind tunnel testing equipment?"
Su Dingping nodded slightly, answering his question.
But such a relaxed nod of answer shocked all the air force military industry experts sitting below!
Now that the third-generation wind tunnel testing equipment is in place, there will be no problems with the construction of the wind tunnel testing center.
According to their understanding, construction is probably already underway, right?
How long has it been?
The speed is too fast, right?
Could it be that as soon as the White Bear Tribe removed the equipment, the domestic third-generation wind tunnel equipment was completed, which is unbelievable to them.
This is not the same as telling the White Bear Tribe that your chokers have no effect on us!
How would they know that Su Dingping had started researching wind tunnel equipment a long time ago, and now he just took it out and built one himself.
The reason why it took so long was simply because his energy was scattered and he couldn't use it all to study wind tunnel testing equipment, otherwise the speed would be even faster.
"Okay, none of this matters."
Su Dingping looked very relaxed and content, "After a while, the construction will be completed, and you will all have the opportunity to participate in the research of related topics. Well, our main task now is to give lectures."
After that, he distributed the relevant wind tunnel information.
After everyone got the information, he continued to teach.
“Unlike ordinary wind tunnels, the difficulty of hypersonic wind tunnels lies in the extremely harsh air flow velocity and pressure conditions that need to be simulated.”
"Specifically, hypersonic wind tunnels need to reach wind speeds of 10 to 18 times the speed of sound, which makes traditional fan driving methods unable to meet the demand. In order to achieve such high flow rates, the design and manufacturing of wind tunnels require the use of special materials and technology.”
"In basic physics, when the temperature on one side rises rapidly, the volume of air expands, but its mass remains unchanged, which causes the density to decrease."
"When the temperature drops sharply on the other side...then an air difference will form! The formation of wind is caused by the pressure difference in the air. You all know this."
After a slight pause, Su Dingping started talking again.
"... When building an advanced wind tunnel, you need a high-pressure gas cylinder to store some high-pressure gas, and use the ultra-high compressed air from the high-pressure gas cylinder to replace the electric fan."
"Actually, this is not enough. At this time, the air pressure difference is there, but the maximum pressure difference is not achieved."
"When is the maximum pressure difference? If the pipeline corresponding to the high-pressure gas cylinder is vacuum, then the pressure difference will reach the maximum."
"So at this time, we have to pump out the air in the pipe."
"After the vacuum pipe is formed, as soon as the high-pressure gas bottle is opened, the high-pressure gas rushes into the pipe with a whistle, eventually forming a higher wind speed."
Su Dingping was talking non-stop, and everyone below, whether they were experts or newcomers, listened carefully with their ears widened, not daring to stray or get distracted in the slightest.
They all know that the things Su Dingping explained are the core technologies of wind tunnel construction, which are not disclosed abroad at all, so they have no place to learn them.
Su Dingping on the podium glanced at everyone and then continued to explain.
"Turn the information to the next page and let's continue." "After the vacuum pipe is formed, once the high-pressure gas bottle is opened, the high-pressure gas quickly flows into the pipe, eventually forming a higher wind speed."
"In this way, we need to build a key thing, which is the vacuum ball. In fact, there is nothing inside this ball."
"Of course, just a vacuum ball is not enough. A complex heating system also needs to be built."
"The larger the wind tunnel, the more troublesome the heating system will become. In addition to heating, an air dryer is also required, and the air humidity must be accurate."
Next, Su Dingping continued to explain again.
"For example, when experimenting at five to ten times the speed of sound, the specific humidity of the air is 0.00075 pounds of water per pound of air. Then there will be an error of 1% in the force changes produced by the model in the wind tunnel..."
"Of course, this is not enough."
"The speed of the wind blown out of a wind tunnel built with pressure difference is still not enough. Because its maximum limit is about five times the speed of sound. Therefore, if we want to increase the wind speed of the wind tunnel, we must find other ways to find other ways."
Having said this, Su Dingping paused and looked at everyone.
"Everyone, let's think about it. What better way can we do?"
He directly put the question to those who were listening carefully and asked them to think about it.
Because this already involves knowledge related to the fourth generation wind tunnel, establishing a new generation of wind tunnel and developing supersonic weapon systems.
For a moment, everyone below looked at each other.
After a moment of silence, a brave person stood up: "Teacher Su, is it possible to create a pressure difference through high-voltage current..."
"I think the Tesla effect of electromagnetic reaction can be used...but in this case, it is still a little bit meaningless, and it is too difficult to achieve."
"Electromagnetic reaction is impossible to achieve. We don't have that technology at all now, and we still don't know how to build it."
Everyone discussed it for a long time, but no one said it could be implemented. It was either too difficult or simply stuck in fantasy.
Naturally, they couldn't agree, and finally everyone turned their attention to Su Dingping.
Su Dingping smiled casually, and then continued to lecture.
"Actually, this already involves the fourth generation of wind tunnels, which we can call shock wave wind tunnels."
"Speaking of it, it's actually very simple, that is to use explosions."
"The explosion will produce a shock wave, and this shock wave will push the air, and the shock wave will push the air faster than the air moves."
"So in this way, the air will be compressed, and the compressed air will have a greater pressure than the compressed air we produce... Eventually we can achieve a wind speed of forty times the speed of sound or higher... ”
The explanation of the construction theory related to the new generation of wind tunnel was explained in simple and profound terms, which made everyone below listen with interest.
They kept taking pens and taking notes carefully, for fear of missing half of the knowledge points.
The Longxia Tribe is not only building a third-generation wind tunnel to test heavy-duty products, but judging from the current situation, the fourth-generation wind tunnel is also under research. It can be said that it is suddenly at the forefront of the world.
For those military industry experts of the Air Force, it is even more like a treasure.
After a while, a new talented doctoral student stood up: "Honestly, I have a question."
"Okay, you say."
Su Dingping raised his hand and gestured to the man.
He still likes it very much. Being able to ask questions in class proves that others are listening carefully and thinking of their own.
"How to determine its suitability based on the similarity between the Reynolds number (Re) and Mach number (Ma) in the wind tunnel test and actual flight?"
The genius doctoral student asked immediately.
This has reached a very difficult and in-depth field of knowledge. New graduate students and doctoral students feel overwhelmed by it, and interns from the research institute are also confused.
Even many professors have fallen into thinking, and they are also considering this issue.
Before Su Dingping could speak, the new doctoral student asked again.
"It is well known that two flows are similar when Re and M are equal and the streamlines are similar. That is to say, if you want to simulate the flow of a real machine, the Reynolds number of the model machine in the wind must be the same as that of the actual machine. Equal.”
"... If an aircraft cruising at subsonic speeds shrinks and wants to keep the Reynolds number equal, the flow velocity will increase and exceed the speed of sound, causing the lift and drag characteristics to change greatly. How should this be simulated experimentally?"
"How to determine the flow velocity in the experiment? Do the Reynolds numbers have to be equal? How to estimate the parameters of the real machine if the Reynolds numbers are not equal."
"Also, if only one Reynolds number and Mach number are equal, what impact will it have on the experimental results?"
The other party's mouth kept firing like a machine gun, throwing out a series of questions that would have confused an average professor. His professionalism was so strong that even an average professor would have to think for a moment.
Su Dingping was very happy to meet a young man with some wind tunnel skills.
The more such young people there are, the happier he will be.
At least people are thinking about it and are very interested in wind tunnel technology and aerodynamics.
Su Dingping smiled and pressed his hand, motioning for the doctoral student to sit down.
"He was able to raise so many questions. To be honest, I am very happy and happy to see you think deeply about related issues."
"Okay, let's get down to business."
I don't know why, but after hearing the praise from Su Dingping, the doctoral student felt extremely happy and proud.
(End of chapter)