I built an armada

The newcomers were all shocked beyond measure!

Even if they racked their brains, they could not imagine that the man in front of them, who looked younger than these talented people, was actually the teacher Su who was elusive in the mouths of the top military experts!

At this moment, they wanted to question it, but from the top military experts who called him Chief Engineer Su, Teacher Su, they all showed everyone the true identity of the young man who stood on the podium and lectured to everyone.

This is the legendary Chief Engineer Su!

Even though the first class was over, their heads were still buzzing, and they felt like they were hit hard.

Such facts gave them a great blow.

Many of them were studying for undergraduate, master and doctoral degrees, and many of them were even recommended students. They can be said to be truly talented people, top scientific and technological talents.

Originally, they thought that they could still regard themselves as geniuses after entering here, and they could easily do the work here, and even easily achieve results.

It was not until they were assigned to various military experts and began to work on scientific research projects in the base that they realized how arrogant they were, and their self-confidence was greatly hit.

Later, they felt that the legendary Chief Engineer Su was, after all, an elderly and kind old man, which was in line with everyone's imagination and made them feel more comfortable.

They even thought of a set of words to comfort themselves. Even if they could not compete with the other party in academics, they were young. With their own intelligence and wisdom, maybe when they reached the age of "Chief Engineer Su", they would also be experts at the level of a master.

But who could have thought that the so-called kind old man was all their imagination and did not appear.

The person standing on the podium was a little too young, and even if they dared to pull out a random person, he would be older than this Chief Engineer Su.

This directly broke their defense, because in front of this Chief Engineer Su, almost all of the things they were proud of were not worth mentioning.

Whether in terms of age, experience, or knowledge, they all lost miserably, without any pride at all.

This is what we call a true dragon among men, a true pride of heaven!

At the base, they all heard from the grassroots engineers that Chief Engineer Su was a person that the three military leaders highly respected and regarded as a treasure.

And what do they have?

Su Dingping didn't care what the newcomers were thinking, and he didn't have the leisure to care about those things.

After talking about the machine gun, Su Dingping corrected many military experts' misconceptions about the subsequent scientific research direction of fighters 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 engines in wind tunnel testing."

When the top experts present heard this content, they were all shocked and their eyes widened, and their ears were like rabbit ears, stretched out.

Since the White Bear Tribe unilaterally cancelled the agreement and forcibly removed the wind tunnel equipment some time ago, the Air Force's related research and development has entered a stagnant stage, which makes them very helpless.

The Air Force has to allocate some of its strength to deal with the related manufacturing issues of wind tunnel test equipment, and at the same time, it must have the strength to overcome the manufacturing issues of the engine.

The Air Force does not have the strength to do both at the same time, even if it is given a few more years.

No matter which one, it is extremely difficult for the Air Force, and it is not an exaggeration to say that it is difficult to climb to the sky.

And now Su Dingping actually directly talks about the relevant technical issues of wind tunnels in class, and he starts with the third-generation wind tunnel.

So confident?

Could it be that the wind tunnel has been solved? Is it true or false?

So, an expert stood up excitedly and asked directly: "Chief Engineer Su, have our domestically produced third-generation wind tunnel test equipment been solved?"

Su Dingping nodded slightly, which was considered an answer to his question.

But the air force experts sitting below were all shocked by his relaxed nod!

The third-generation wind tunnel test equipment has been completed, so there will be no problem with the construction of the wind tunnel test center.

According to their understanding, construction is probably already underway, right?

How long has it been?

Isn't the speed too fast?

Doesn't it mean that the White Bear Tribe just withdrew the equipment, and then the country completed its third-generation wind tunnel equipment, which made them unbelievable.

Isn't this equivalent to telling the White Bear Tribe that your bottleneck has no effect on us!

How could they know that Su Dingping had already started researching wind tunnel equipment, and now he just took it out and built one for himself.

The reason why it took so long was purely because his energy was scattered and he couldn't use it all to study wind tunnel test equipment, otherwise the speed would be even faster.

"Okay, none of this matters."

Su Dingping seemed very relaxed, "After a while, the construction will be completed, and you will all have the opportunity to go in and participate in the research of related topics. Okay, 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 lecture.

"Unlike ordinary wind tunnels, the difficulty of hypersonic wind tunnels lies in the extremely harsh air flow rate and pressure conditions they need to simulate."

"Specifically, hypersonic wind tunnels need to reach wind speeds of 10 to 18 times the speed of sound, which makes traditional fan drive methods unable to meet the needs. In order to achieve such high flow rates, the design and manufacture of wind tunnels require the use of special materials and technologies."

"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 on the other side drops sharply... then an air difference will be formed! And the formation of wind is caused by the pressure difference of air. You all know this."

After a slight pause, Su Dingping started to talk 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 in the high-pressure gas cylinder to replace the electric fan to work."

"In fact, this is not enough. At this time, the air pressure difference exists, but the maximum pressure difference has not been achieved."

"When is the maximum pressure difference? If the pipeline corresponding to the high-pressure gas cylinder is a vacuum, then the pressure difference will reach the maximum."

"So at this time, the air in the pipeline must be evacuated."

"After the vacuum pipeline is formed, once the high-pressure gas cylinder is opened, the high-pressure gas whistles into the pipeline, and finally forms a higher wind speed."

Su Dingping talked endlessly, and the people below, whether experts or newcomers, listened carefully with their ears wide open, not daring to be absent-minded or distracted.

They all knew that the things Su Dingping explained were the core technologies of wind tunnel construction, which would not be told abroad at all, so there was no place to learn.

Su Dingping on the podium glanced at everyone and continued to explain.

"Turn to the next page and we'll continue."

"After the vacuum pipe is formed, once the high-pressure gas cylinder 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, that is, a vacuum ball. In fact, there is nothing inside this ball."

"Of course, just a vacuum ball is not enough. A complex heating system needs to be built."

"The larger the wind tunnel, the more troublesome the heating system will become. In addition to heating, there must be an air dryer, and the air humidity must be accurate."

Next, Su Dingping continued to explain again.

"For example, when the experiment is five to ten times the speed of sound, the specific humidity of the air is 0.00075 pounds of water per pound of air, so there will be a 1% error in the force change of the model in the wind tunnel..."

"Of course, this is far from enough."

"The wind speed of the wind tunnel made by the pressure difference is still not fast 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 another way to think of other ways."

At this point, Su Dingping paused and looked at everyone.

"Everyone, think about it next, what better way can you have?"

He directly threw the question to those who listened carefully to the class and asked them to think about it.

Because this already involves the relevant knowledge of the fourth-generation wind tunnel, building a new generation of wind tunnels and developing supersonic weapon systems.

For a moment, everyone below looked at each other.

After a moment of silence, a brave person stood up and said, "Teacher Su, can we use high voltage current to create a pressure difference..."

"I think we can use the Tesla effect of electromagnetic reaction... But this is still a little bit lacking, and it is too difficult to achieve."

"Electromagnetic reaction is impossible to achieve. We don't have the technology at all now. We don't know when we can build it."

Everyone discussed for a long time, but no one said that it could be put into practice. Either it was too difficult, or it was just a fantasy.

Naturally, there was no consensus, and finally everyone cast their eyes on Su Dingping.

Su Dingping smiled casually and continued to lecture.

"In fact, this has already involved the content of the fourth-generation wind tunnel, which we can call a shock wave wind tunnel."

"Speaking of it, it is actually very simple, that is, using the method of explosion."

"The explosion will produce a shock wave, and this shock wave will drive the air to move, and the speed at which the shock wave drives the air is faster than the speed at which the air moves."

"Therefore, in this way, this will compress the air, and the pressure of this compressed air is greater than the compressed air we produce... In the end, we can get a wind speed of forty times the speed of sound or higher..."

The explanation of the construction theory of the new generation of wind tunnels was easy to understand, which made the people below listen with relish.

They kept taking notes carefully with pens, for fear of missing half a knowledge point.

Longxia tribe is not only already building the third-generation wind tunnel to test heavy equipment, but also, according to the current situation, the fourth-generation wind tunnel is already under research, which can be said to be at the forefront of the world.

For those military experts in the air force, it is even more like a treasure.

After a while, a new talented doctoral student stood up and said, "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 speed shrinks and wants to keep the Reynolds number equal, the flow velocity will increase and exceed the speed of sound, causing a significant change in lift and drag characteristics. How should this be simulated experimentally?"

"How to determine the flow rate 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 to the point."

I don't know why, but after hearing the praise from Su Dingping, the doctoral student felt extremely happy and proud.