Chapter 986 Aerodynamics

Liu Changyun looked at everyone and explained again why he called Zhao Zhongyao here.

After everyone listened, they also knew why Zhao Zhongyao appeared here.

Zhou Quancheng saw that Zhao Zhongyao was coming, and he thought: "You Zhao Zhongyao is here, what's the matter." What is this plane you designed? Today, I want to see what you say about your plane. ”

After Liu Changyun said what he had just said, he looked at Zhou Quancheng again and said, "Expert Zhou, if you have any questions now, you can ask Expert Zhao, and he will give you a satisfactory explanation." ”

Zhou Quancheng listened to Liu Changyun's words, smiled again, looked at Zhao Zhongyao and said, "Expert Zhao, I and several other experts have also seen your design drawing of the new fighter. We feel that this new fighter you designed is really not very good. It's not just weird. It is even more contrary to the principle of aerodynamics. I really don't know how you could have come up with such an airplane. This plane can only be shown to everyone on the drawings, and if it is made into a real plane, it will be impossible to fly at all. ”

After listening to Zhou Quancheng's words, Zhao Zhongyao smiled and said, "Haha, Expert Zhou, I don't know what you think." I don't know, you don't know what aerodynamics is. ”

Zhao Zhongyao had already figured out how to deal with these old guys. Therefore, as soon as he exits, it is not difficult for these old guys to save face.

As soon as Zhou Quancheng heard Zhao Zhongyao's words, his heart suddenly became angry: "Hehe! Yes, several of our aviation experts don't understand aerodynamics. What are you talking about? If we don't understand aerodynamics, how can we know that the geometry of the aircraft you designed is not aerodynamic? ”

Zhao Zhongyao listened to Zhou Quancheng's words, then smiled again and said: "Haha, yes! Since you know what aerodynamics is, then how can you still say that the plane I designed is impossible to fly." ”

"Zhao Zhongyao, how do you want me to explain it to you. When a few of us were in college, we studied aircraft design. You can say that we all came from professional backgrounds, and you! You were just an expert in designing firearms.

To put it bluntly, you're nothing more than a gunsmith. You say that you don't want to be a gunsmith, why do you have to design airplanes? Do you know how to design airplanes? After two months of studying at the 'Zhuhai Aviation Academy', do you feel like an aircraft designer? Don't you think it's ridiculous that you think this kind of thinking.

If someone else wants to learn knowledge for a few years, can you learn it in two months? If you only study for two months, what can you learn? I think you haven't even learned the surface of designing airplanes. When you design this plane, you're completely fooling around, and it's completely impossible to fly.

I really can't figure out how you could have designed such a weird-looking plane. Even if you don't know how to design, if you make a gourd to draw a scoop, you won't be able to design like this!"

Zhou Quancheng himself couldn't figure it out. He also didn't understand how Zhao Zhongyao could design such a strange-looking plane. It's completely beyond the imagination of ordinary people. Not to mention ordinary people, even if he is an aviation expert, he can't imagine how Zhao Zhongyao thought of designing the fighter plane to look like this.

Zhao Zhongyao listened to Zhou Quancheng's words for a long time, then laughed twice and said: "Haha, Expert Zhou, there are many things in this world, you may not know, or you have never seen them at all. One day, when you see something that you haven't seen before, don't you think it's strange? should not be in this world. That's what you think of the plane I've designed! I'm just going to give you four words of fuss. ”

Zhou Quancheng listened to Zhao Zhongyao's words, then glared at him again and said, "What do you mean, I'm making a fuss." But you can also explain to me how you designed this plane. Also, you say that we aviation experts don't understand aerodynamics. Then you, a military expert, should give us a good explanation of what aerodynamics is, so that we can gain some knowledge. We, the aviation experts, are all indiscriminate guys, and we don't understand aerodynamics, and we haven't studied aerodynamics. ”

When Zhou Quancheng heard Zhao Zhongyao's words, he was also a little angry. He was thinking, maybe this Zhao Zhongyao was just a guy who was indiscriminate, maybe he didn't understand anything at all. Just wanted to express himself, so he casually designed an airplane, saying that this kind of aircraft is the most advanced aircraft in the world, and he just wanted to show it in front of the leader.

Zhao Zhongyao listened to Zhou Quancheng's words, then smiled again and said: "Haha, okay, since that's the case, then I'll teach you so-called aviation experts a lesson! I feel that the aviation knowledge you learned before may be outdated." ”

"Okay, that's good, the knowledge we learned is outdated, so you can tell us some new aviation knowledge!" Zhou Quancheng looked at Zhao Zhongyao unconvinced and said.

"Well, you're all listening. Zhao Zhongyao looked at Zhou Quancheng and them, thought for a while, and began to explain.

"Aerodynamics is a branch of mechanics that studies the mechanical properties of aircraft or other objects in relation to air or other gases, the laws of gas flow, and the accompanying physicochemical changes. It is a discipline that has grown up on the basis of fluid mechanics with the development of the aviation industry and jet propulsion technology.

Generally speaking, the content of aerodynamics research is the change law of the speed, temperature, pressure and density of the gas in the flow field of aircraft, missiles and other aircraft under various flight conditions, the aerodynamic force and its change law such as lift and drag force on the aircraft, the physical and chemical changes that occur between the gas medium or gas and the aircraft, and the heat and mass transfer law. In this sense, there are two ways to classify aerodynamics.

First, according to the speed range of fluid motion or the flight speed of the aircraft, aerodynamics can be divided into low-speed aerodynamics and high-speed aerodynamics. Usually the speed of 400 km/h is used as the demarcation line. In low-velocity aerodynamics, the gaseous medium can be considered incompressible, and the corresponding flow is called incompressible flow. For flows greater than this velocity, the compressibility of the gas and the change in the thermodynamic properties of the gas must be taken into account. This flow, which corresponds to high-speed aerodynamics, is called compressible flow.

Second, according to whether the viscosity of the gas medium must be considered in the flow, aerodynamics can be divided into ideal aerodynamics and viscous aerodynamics.

Generally speaking, the study of aerodynamics is divided into two aspects: theoretical and experimental. Theoretical and experimental research are closely integrated and complement each other. The general principles on which the theoretical research is based are: in kinematics, the law of conservation of mass, in dynamics, in Newton's second law, in terms of energy conversion and transfer, in terms of energy conservancy, in thermodynamics, in accordance with the first and second laws of thermodynamics, in terms of medium properties, in accordance with the corresponding gas equation of state and the law of change in viscosity and thermal conductivity, etc. ”

Zhao Zhongyao looked at Zhou Quancheng and several other aviation experts, and explained to them the knowledge of aviation that he knew.

Some of this knowledge was re-learned by him in the 'Zhuhai Aviation Academy'. Some of them were also known in the world he had already learned.

After Zhao Zhongyao explained these theoretical knowledge, he took the drawings of the stealth fighter he designed and explained: "Although the new fighter I designed this time looks strange, it still conforms to the principle of aerodynamics. If it were designed to be a real airplane, it would have been able to fly.

Despite the geometry of the aircraft, it is still aerodynamic. As long as the research is successful, it will be able to soar into the blue sky. The main reason why I want to design this kind of aircraft in the shape of a geometric shape is for the reason of invisibility.

As I said, there is a big difference between this new fighter I designed and an ordinary fighter, that is, it can avoid the reflected waves of air defense radars. If this kind of fighter is designed, even if it flies over the enemy country, it will not be discovered by the enemy country. Because this kind of fighter can disappear on the display of the enemy's air defense radar.

The enemy's air defense radar cannot detect this new type of fighter we designed, so they should not think of using anti-aircraft missiles to shoot down this new type of fighter of ours. You say, the new type of fighter I designed is not very advanced? ”

Zhao Zhongyao spoke in detail and professionally. After Zhou Quancheng and several other aviation experts listened to it, they couldn't help but feel shocked in their hearts by Zhao Zhongyao's aviation knowledge. You must know that Zhou Quancheng and they are all experts in the aviation industry. The knowledge they have is almost all the aviation knowledge of this era. But after listening to Zhao Zhongyao's lecture, they felt that there were some things that they had heard of for the first time. I hadn't heard anyone say it before.

However, how could Zhou Quancheng be willing to admit defeat in front of Zhao Zhongyao! After listening to what Zhao Zhongyao said, he glanced at Zhao Zhongyao with contempt and said, "Expert Zhao, we all know these things you are talking about. These things are just some theoretical knowledge.

But what's the use of talking about that? We are all experts in aviation knowledge, and if you just give us theoretical things, I'm afraid it won't be interesting! If you have the ability, do you want to get some real things for us to see? ”

After Zhou Quancheng finished speaking, several other aviation experts also looked at Zhao Zhongyao and echoed: "Yes! Expert Zhao, what's the use of just not practicing, we still like to look at some young people who are willing to work hard, rather than those young people who can only talk about it." ”

Zhao Zhongyao listened to their words, then looked at Zhou Quancheng again and smiled and said: "Expert Zhou, how do you want to practice, do you want me to develop a stealth fighter I designed right now? It will take at least three years for any new fighter to be successfully developed from design to development. How could I have developed a real stealth fighter for you right away. ”

"Well, you don't need to study a real fighter first, I think you might as well study a model fighter first! If you design this kind of aircraft, if you directly study the real plane, I'm afraid you will waste manpower and material resources. When the time comes, your plane will fly at all, and that's not a big joke. Zhou Quancheng looked at Zhao Zhongyao again and said.

In fact, Zhou Quancheng had already thought about how to deal with Zhao Zhongyao just now. He thought that it was not interesting to just listen to Zhao Zhongyao's theories. Since he said that the fighter he designed was reasonable, he should let him research a model aircraft to see.

Listening to Zhou Quancheng's words, Zhao Zhongyao sneered and said: "Hehe! That's really good, before, when I was studying at the 'Zhuhai Aviation Academy', I had already designed a model aircraft of this kind of stealth fighter that I designed. If you're not convinced, of course I can design a model airplane to show you. ”

"Okay! A few of us have recently wanted to design a new type of fighter! In that case, then we might as well have a competition! Let's all design a model airplane first, and see who can design it well. What do you think. Zhou Quancheng listened to what Zhao Zhongyao said, and of course he was not convinced. But he thought that if the competition was real, it would be a relatively long time, and it would be better to study it into a model aircraft first, and if the competition was conducted, it would not be possible to achieve it soon.

"Okay, then we can just talk. Zhao Zhongyao listened to Zhou Quancheng's words, and also smiled and agreed.

After that, Zhao Zhongyao looked at Liu Changyun again and said: "Minister Liu, Expert Zhou wants to design a model aircraft first, to compete with the model aircraft I designed before." If you have any instructions, you can also talk about them now. ”

Liu Changyun listened to Zhao Zhongyao's words, stood up, looked at everyone and said, "Okay, I listened to the conversation between the two of you just now. I feel that I don't understand some of the aviation knowledge that you professionals say.

It's just what Expert Zhou said, I think it can be done. The study of a new type of aircraft is a major project, which cannot be accomplished overnight, and it requires a series of processes from theory to practice, such as design, demonstration, development, and test flight.

What Expert Zhou said just now is good, if this new type of fighter designed by Expert Zhao is directly researched, then if it can't fly at all, isn't it a waste of manpower and material resources!

Instead of this, it is better to first study a model aircraft fighter, perform it, and show it to everyone. If this model airplane is a good performer. Naturally, this new type of fighter can fly into the blue sky. ”