readx;? In the wind tunnel laboratory of the Automotive Research Center of Nanqi Group, Li Fanyu and several students have worked together to fix the A4 clay model of the real car scale on the test bench. Pen & Fun & Pavilion www.biquge.info

The wind tunnel laboratory is not really a "hole", it is a combination of a tunnel and a giant wind turbine. If a huge knife cuts through the room where Li Fanyu is located, you can see that the entire laboratory is actually a hollow-shaped structure.

And the room where Li Fanyu is located has a big hole at each end is actually just a section of the tunnel.

Although the staff of Nanqi were curious, they had already received the advice of their immediate superiors - stay away from the people who believe in the faith, and don't provoke them.

So in the laboratory at this time, there were only Li Fanyu and Wang Dazui, and a few students.

In order to better distinguish the white smoke that marks the airflow, the 1:1 scale mould of the A4 has been painted blue.

A student checked it again, and after making sure that the preparations were correct, he came to Li Fanyu and stood still: "Senior brother, it's all over, can we start?"

Li Fanyu asked Wang Dazui with his eyes, and the latter prepared the camera and nodded.

"Okay, let's go!"

As the working gates were closed, a windmill-like sound came from the two large holes in the room, and the giant fan began to run slowly.

After about ten minutes, a huge air flow erupted from the air outlet at one end of the laboratory.

Air resistance is the largest and most important external force encountered by a car when driving.

There are generally three types of air resistance encountered by the vehicle during driving, the first is the resistance caused by the air flow hitting the front of the vehicle. This resistance is easy to understand, and you can feel it when you walk with a plank facing the wind on a windy day. The second type is frictional resistance, which is so small that it is almost negligible.

Generally speaking, when the vehicle is driving at high speed, the external resistance is the main source of air resistance. This drag is created by the high velocity of the airflow through the body, creating a vacuum zone at the rear of the car. Vacuum, there will be tension, so in general, the better the rear streamline, the less affected by the vacuum area, the faster it runs.

The wind tunnel test was mainly carried out for frontal resistance and external resistance.

Six white smoke blew along with the gale A4 model, looking at the slowly rising wind value on the instrument, Li Fanyu was a little anxious.

Because after all, the shape has been changed, and if a mistake leads to excessive wind resistance, then this period of work and effort will be in vain.

Wang Dazui took the SLR, adjusted the focus slightly, and took two photos of the model. When he turned around, he saw that Li Fanyu's face was a little anxious, so he smiled and patted him on the shoulder.

"Don't worry, brother. This is just the first test, even if the value is not good, it doesn't matter, just go back and revise it. None of the models I've tracked and reported on before can be finalized all at once. ”

Li Fanyu reluctantly smiled and nodded.

Wang Dazui's comfort didn't play a big role, because Li Fanyu was too concerned about this test.

You know, aside from the performance of the engine, the drag coefficient is the decisive factor in determining the fuel consumption and speed of a car.

Let's put it this way, when a car is driving, the resistance to overcome is the frictional resistance of the organic parts, the road resistance generated by the tires, and the air resistance.

However, as the speed of the vehicle increases, the air resistance becomes the greatest driving resistance. At speeds above 200 km/h, air resistance accounts for almost 85% of all driving resistance!

cars, especially sports cars and sedans. If the drag coefficient is not well controlled, the fuel consumption will soar upward.

Li Fanyu is not afraid of failure, he is afraid that he will not have time. The production lines of several workshops have been set, and Pan Qiang has gone to several domestic production line placement companies but has not been able to find a suitable one. In the end, An Ning stepped forward and introduced a set of old French production lines through foreign relations. Although it is expensive and broken, it can be used high and low.

is such a production line, and almost all of Li Fanyu's worth is required. More than 400 million, plus follow-up installation and commissioning, 500 million can be stopped.

Now the whole Zhengxin is relying on the second-hand car platform to maintain, if A4 drag on for a year or two to go offline, the company has no new revenue, really to the rhythm of the dog.

The test of the wind resistance coefficient is automatically calculated with the gradual increase of the wind speed in the wind tunnel, Li Fanyu looked anxious, and turned around and walked to the door.

When Wang Dazui saw his strange appearance, he knew that he was anxious, so he took out a cigarette from his pocket and handed it over.

"Go out and smoke a cigarette to breathe, and when you come back in a while, the results will come out. ”

Li Fanyu doesn't smoke, but he couldn't bear to be upset, so he took it in his hand and turned around and went out.

The sky outside was a little hazy, and it looked like it was going to snow. He looked around and sat down on a stone pier in front of the lab.

Wang Dazui is an old smoker, and he can't beat one pack a day. So although the salary of this product is now more than 40,000 yuan a month, it still smokes seven five-day boxes of Hongta Mountain.

Li Fanyu took out one and stuffed it into his mouth, and lit it in a decent way. As soon as I took a puff, I was choked by the spicy smoke and felt like I was vomiting.

He hurriedly threw the cigarette on the ground and covered his mouth for a long cough.

Hey, it would be great if the production capacity of the X super line could keep up.

He suppressed the feeling of nausea and thought sullenly.

But as soon as he thought about it, he immediately abandoned the idea.

There is nothing wrong with my choice, sooner or later I will come to this road, and I can't always count on X black technology.

Although xapp can create huge benefits in a short period of time and make money quickly, it is rootless water. If you want to achieve the goal you have set, you will have to take this road sooner or later.

Now that we have chosen, we must unswervingly go on. The rest is left to time to verify whether it is right or wrong.

He sat silently on the stone pier, pulled out the eyes in the cigarette case one by one, and crushed them.

Time passed like this, minute by minute, and I don't know when the crystal snowflakes fell in the sky.

I don't know how long it took, but a student named Wang Rui came out of the laboratory. looked around, and saw Li Fanyu sitting in the corner with his back, and ran over.

"Senior brother, the test results are in!"

Li Fanyu was taken aback by his shout. Hurriedly came back to his senses and got up suddenly.

He threw the tobacco leaves in his hand into the ground and asked urgently, "How much!?"

"Guess?"

Li Fanyu blocked his chest with a mouthful of old blood: I guess your sister! When are you still playing naïve with me?!

He was about the same age as the students, and they always liked to joke when they got acquainted. Wang Rui knew that he was in a hurry, so he deliberately hung his appetite.

If it was usual, Li Fan was in a hurry, how could he still have the heart to play with him, so he was about to kick his feet.

Wang Rui saw that Li Fanyu was really anxious, and hurriedly dodged: "Senior brother, spare your life! The wind resistance coefficient is 0.23!"

0.23？

Pretty!

When Li Fanyu heard this number, he felt that the sky was bright. (To be continued.) )