In fact, Jiang Xinwei can't really study these data, but can only be regarded as caring.

Yes, that is, he cared about these data all his life. If he had to talk about research, he was also studying the electronic circuits of automobiles and the control circuits of engines related to his specialty.

But these amateur studies are not as much as his research on weapons and equipment and even aircraft, although they are all amateurs, but he was a military fan in his last life, and he is much deeper than a car fan.

As the name suggests, the drag coefficient is related to the resistance of the wind to the vehicle when the vehicle is moving.

There are three types of wind resistance (i.e., air resistance) experienced by a vehicle: the first is the drag caused by the air flow hitting the front of the vehicle. You may not feel it when you're slow, but if you shake it with a plank, you can feel it all at once. The faster the vehicle, the greater the air resistance, the stronger the wind we feel, and when we have time to sit in the car, we can feel the wind like a knife cutting people.

The second type is frictional resistance, which is so small that it is almost negligible.

The last type is the external resistance, generally speaking, when the vehicle is driving at high speeds, 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 drag coefficient is a decisive factor in determining the fuel consumption and speed of a vehicle. Because as the speed of the vehicle increases, the air resistance becomes the greatest driving resistance. Vehicles, especially sports cars and sedans. If the drag coefficient is not well controlled, the fuel consumption will soar upward.

Zheng Zitong said: "The drag coefficient we used the wind tunnel to blow the clay model was 0.232. …… That's the perfect number. Domestic cars are not so good, even good foreign cars, and this is basically the number. ”

Jiang Xinwei was naturally very happy to hear the news, and hurriedly asked: "Really, it is similar to the drag coefficient of excellent foreign cars, and what is the general drag coefficient?"

Zheng Zitong said: "Of course it's true. Generally from 0.24 to 0.25, we are 0.232. ”

Jiang Xinwei remembered Zheng Zitong's initial tone, and hurriedly asked, "This is a good thing." Since our drag coefficient is small, let's design the product according to this model. It's not going to have a good drag coefficient, but it's hindering you from designing and producing cars, right?"

Zheng Zitong smiled bitterly: "It's not an obstacle." However, when we designed the product, installed the components and the interior of the car, and then conducted wind tunnel tests, the results were very different. This data is not only not excellent, but also not qualified. The drag coefficient is as high as 0.37. ”

Jiang Xinwei was stunned and asked, "How is it possible?...... What will be the consequences if the drag coefficient exceeds 0.37?"

Zheng Zitong said: "The consequences of 0.37? Once the speed of the car exceeds 100 kilometers, the fuel consumption is more than one-third of the fuel consumption of a normal car! You say, the fuel consumption is so large, who will buy such a car." ”

Jiang Xinwei asked modestly, "Why is this happening?"

Zheng Zitong said: "It's not that there is too much difference between our model data and the actual parts? ”

Jiang Xinxu sighed and didn't speak immediately. He knows the production level of China's automobile industry in his previous life, and he feels that the current situation is normal.

After a while, he asked, "Mr. Zheng, what do you want me to do?"

Zheng Zitong said: "I would like to ask you to take time out of your busy schedule to check the relevant design for us and help us review the construction of the body model. …… , Jiang Dong, you know, after the model is decided, it is very, very important to build a data model, and the workload is also very large. You're an automotive expert and a computer expert, so it's probably best for you to review this matter. ”

Speaking of this, he smiled bitterly: "Jiang Dong, I really don't want to be happy in vain." ”

Thinking of the big leader's expectations of himself, thinking of his previous life and the car dream in this life, Jiang Xinwei hesitated for a moment and said, "Okay." I'll go to you tomorrow. Please arrange two experts for me, first of all, tell me about the modeling, and tell me about the influence of component design on the drag coefficient. If you don't solve the problem, I won't come back!"

Zheng Zitong was overjoyed and hurriedly said, "Jiang Dong, are you really willing to come over? I'll prepare right away, I'll prepare right away, I'll find the best and most authoritative experts to help you. I also contacted Zhang Huan and asked him to send several automotive experts from the former Soviet Union and Italy to come and consult with us. ”

Obviously, Zheng Zitong also knows that Jiang Xinwei's technology in the automotive field is not so good, although he praises Jiang Xinwei as an expert in the automotive field, and wants to encourage Jiang Xinwei to go over.

He didn't know if Jiang Xinwei had passed or not, not because he praised him at all, but because he felt the responsibility on his shoulders.

When he called, Leng Lan next to him had been watching coldly. When he promised to go over, and also said the promise of "don't solve the problem, don't come back", Leng Lan couldn't help but be moved: I didn't expect this guy to be so devoted. I worked hard abroad early on, and I almost lost my life, and now I have to do this before I get back to China. Is he physically able to eat?

At this time, Jiang Xinwei asked again: "Mr. Zheng, why are you processing parts so fast? ”

Zheng Zitong said: "It's still fast? Do you know how many CNC machine tools we have in our factory now? Do you know how many designers, engineers and technical experts we have in our factory? Let me tell you, now as long as the parts are designed, if it is not very complicated, the processing program of the CNC machine tool will come out in two hours. In three to four hours, the parts will come out. Now our workers and technicians are waiting for the rice to go to the pot, eager to do something. Besides, the main components of the car, the engine and the reducer, are ready-made, can it not be fast?"

Jiang Xinxu smiled and said, "It's good to process quickly." I'm worried about slow processing. …… , the engine production line has not been installed. ”

Zheng Zitong said: "The relocation from Shuangzhou City has already been installed. Production workers work day and night. However, the commissioning of the five new engine production lines has not yet been completed. I guess there will be three to five more days. ”

……

Seeing that Jiang Xinxu hung up the phone, Leng Lan asked coldly, "You don't want to live anymore, is it necessary to behave like this?"

.com。 Wonderful Book House .com