Chapter 213

Xue Weidong opened his mouth and wanted to say that I really forgot, but he also knew that he was the only one to lose face when he said that, so he laughed and patted the wing in front of him: "according to my experience, the aircraft with this kind of wing can reduce the overall structural weight of the aircraft, so I don't understand the parameters you just mentioned. Why add one to reduce the structural weight How can the takeoff weight and load of a good wing with low total structure not be significantly improved? "

Although Xue Weidong didn't listen to Zheng Quanli's words very much, he still had a general impression. Therefore, Zheng Quanli was stupid when he said this. He said that this guy was a chicken thief. He knew that he didn't take what he said to himself, but he just did it. Let alone, he was stunned and couldn't help it.

This question is too professional for Zheng Quanli to answer. As he was thinking about how to deal with it, a familiar voice came from behind him: "that's because our wings are not very mature. It's just a verification plane with experimental nature made according to the preliminary wind tunnel test data and our ty-2 UAV platform. After all, the Xingzhou army wants to build a test plane Seek a certain endurance time at high altitude.

Although our wing is still immature, we have reduced the total structure, increased the fuel load, and the advantages of supercritical wing in lift and unique economy, which can meet the basic needs of the army. However, it is a testing aircraft after all. That's why we call this aircraft ty-2plus, otherwise it will be named TY-3 UAV. "

Xue Weidong was very surprised that he didn't wear a military uniform, and he looked very young. He looked at the visitor suspiciously, then turned his head. As soon as he was about to ask Zheng Quan who Lilai was, he saw that the young man in a white Dacron shirt suddenly stretched out his hand to him and introduced himself warmly: "Hello, I'm Tengfei factory The person in charge of, Zhuang Jianye, you must be the leader of the aviation surveying and mapping brigade, right?

If the aerial surveying and mapping brigade needs UAVs for terrain surveying and mapping, I recommend a more mature ty-2 platform. After all, ty-2plus is a special case, and the cost is expensive. If it is generally equipped, it is not cost-effective. If the aerial surveying and mapping brigade wants to have requirements on the endurance time, we can choose turbocharged engine imported from Sweden for you, so that you can carry 200 kg Under the load, our ty-2 platform can reach a endurance of 6 hours.... "

Let's go ~ ~ ~ Zhuang Jianye holds Xue Weidong's hand and begins to sell the ty-2 UAV of Tengfei factory. He hears that Zheng Quanli in the back is the one who holds the forehead straight, and Xue Weidong in the front is the one who stares at the top of his eyes. If there is no glasses in front of him, he may jump out.

How did you start selling to yourself? Wait. Do you know me well?

"Well Xiaozhuang, right? Your ty-2... " Being familiar with Zhuang Jianye, Xue Weidong was a little confused, but after all, he was from the headquarters. He had never seen any scenes before. After his initial maladjustment, he immediately recovered his composure. So he interrupted Zhuang Jianye's chatter and took pictures of the drones around him. However, he was embarrassed. Because the name of the drone was very complicated, Xue didn't remember it.

Zhuang Jianye has a lot of insight to remind: "plus, ty-2plus."

"Yes, Plath Hehe, the name is very special, but it has the potential to be in line with international standards. Just like the supercritical wing you used, this is the first time I have seen it in China. I can see that you have got a lot of information abroad, but I don't know whether you are taking the American route or the European route? "

Supercritical wing is an advanced airfoil which prevailed in Europe and America in the 1960s. As we all know, the pressure of the aircraft surface is different everywhere, and the sound velocity of the air on the aircraft surface is also different, which leads to the different velocity of the air flow in these places.

In other words, the Mach number of the airflow on the surface of the aircraft is not a fixed value.

This is just like swimming. The resistance of the head and upper hand must be different, and the Mach number of the aircraft surface is also a truth.

In some places, when the air flow accelerates, the pressure becomes smaller and the sound speed becomes smaller, so the Mach number in this place becomes higher, on the contrary, the Mach number will be lower.

In the process of continuous acceleration of the aircraft, the Mach number of these points will continue to increase. The point with the largest Mach number reaches a critical value, which is the so-called critical Mach number.

That is to say, if the whole aircraft does not exceed the speed of sound, some points on the surface of the aircraft have exceeded the speed of sound.

At this time, something called shock resistance will be produced on the surface of the aircraft, which will consume the power of the aircraft and affect the speed and endurance of the aircraft.

In order to solve this problem, supercritical wing came into being. In the late 1960s, NASA found that the first part of the aircraft wing to exceed the speed of sound was usually the curved surface on the upper surface of the wing through wind tunnel tests on different airfoils.

In this place, the air flow is accelerated very fast, the pressure is relatively small, the sound speed is relatively small, and the Mach number in this place is the largest. Therefore, they proposed a method that does not have the obvious radian of the general airfoil to make the velocity and pressure distribution more uniform.

The head and tail have also been adjusted accordingly. The head is smoother and the tail is sharper. Besides, there is a concave part in the lower edge. The purpose of this design is to make the air pressure on the upper and lower surfaces more uniform.In this way, the supercritical wing can obtain a higher speed without exceeding the speed of sound. With the speed, the economy will be very good, and the total structure of the aircraft will be reduced accordingly. Therefore, in the case of the same weight, it not only has to be farther, but also can carry more goods or weapons.

Therefore, as soon as supercritical wings appear, they are sought after by European and American aviation giants, especially in the field of civil aviation. Flying farther, installing more, and low fuel consumption are always the goals of civil aircraft, and supercritical wings fully meet this demand.

As a result, since the 1980s, Airbus in Europe took the lead in applying supercritical wings to A300 airliners, followed by Boeing, McDonnell Douglas and Lockheed. Soon, European and American civil airliners swept the international market with more economical fuel consumption and larger load, and pinned down the Soviet civil airliner that intended to enter this field, thus establishing the European and American position in the world The monopoly position in the field of passenger aircraft.

Of course, while Europe and the United States jointly suppressed the Soviet civil aircraft, the internal competition between them was also very fierce, especially on the supercritical wing. Although all the technologies came from NASA, after more than ten years of development, the European route represented by Airbus and the American route represented by Boeing have already formed.

That's why Xue Weidong asked. After all, the two routes have their own advantages. Xue Weidong wanted to know which one was used by Tengfei factory?

In this regard, Zhuang Jianye was very proud of his brilliant smile and also took a picture of ty-2plus: "we are using the Chinese route."