Chapter 63 Stronger than them

After the seminar, Chang Haonan was not surprised to be surrounded by a group of people again.

In addition to those who come to him to discuss fluid dynamics simulation issues, there are also some people who are very interested in the situation of MA-60.

Even Yao Mengna and Lin Shikuan who were with him were asked many questions.

Therefore, it was not until about one o'clock in the morning that Chang Haonan and the three finally "escaped" from the conference room.

"call--"

Lin Shikuan, who had not encountered such a battle for a long time, moved his somewhat stiff body and took a deep breath with pleasure.

Even though I was following Chang Haonan to get the chance, I still felt like I was being surrounded and asked questions.

Cool!

But as soon as he thought about it, he felt a little worried again.

"Dr. Chang, can the flow field simulation analysis you just mentioned at the meeting really match the test flight results?"

Over the past year or so, Lin Shikuan and his engineers have actually been working very hard to learn from the advanced experience of their foreign counterparts. Even though information technology is not developed and there are technical barriers in the field of engineering simulation, they are still Read a lot of literature and technical manuals.

We really can't blame them for not making any outstanding achievements. After all, China has no foundation in this area.

Therefore, Lin Shikuan is very clear that even Americans who are at the forefront of aerodynamic simulations cannot guarantee the accuracy of numerical calculation results. They can only say that there are no problems with the rules.

However, Chang Haonan is ready to directly challenge the comparison between numerical calculation results and test flight data!

"Is it completely consistent? Of course I dare not say, so we need to test the flight." Chang Haonan shook his head: "But if you can choose the right simulation method, it is not difficult to control the average difference to about 5%. "

This data shocked Lin Shikuan so much that he even forgot to continue walking and just stopped in place.

In the field of engineering design, an error of 5% is an accuracy that can only be dreamed of.

There are no two identical leaves on a tree, nor two identical air currents on the earth.

Even if the same aircraft is used for two consecutive test flights, there may be a few percent difference between the data obtained.

"But...but...how was this done?" Lin Shikuan asked in an unbelievable tone:

"We have also communicated with the French and Americans, and even they cannot achieve this level."

"Are they hiding something secret?"

"This is not a technical detail, there is no need to hide it." Chang Haonan waved his hand:

"Besides, as long as you refer to their aircraft design cycle, you can roughly estimate that they really can't achieve this level of accuracy."

"But, have you ever thought about..."

At this point, Chang Haonan suddenly stopped and turned around to face Lin Shikuan behind him:

"What they can't do, doesn't mean we can't do it too? Or is it that we are stronger than them?"

"This……"

Lin Shikuan stared blankly at Chang Haonan, who had his hands in his pockets.

He could feel that what a confident spirit was hidden under the other person's calm appearance!

We are stronger than them!

In the 90s, how many people could say this from the bottom of their hearts?

However, Chang Haonan didn't just say it.

His tone and expression when he said these words seemed to have a kind of magic that made others believe that he could really do it.

Yao Mengna, who had been walking alone in front, subconsciously looked back because of these words.

The other party's image seemed to grow taller at this moment.

Of course, what neither of them know is that for Chang Haonan, who returns from 2023, having this kind of thinking is completely normal.

Looking at Lin Shikuan who was stunned, Chang Haonan smiled, turned around and continued walking towards the dormitory.

The former finally reacted at this time and quickly caught up to Chang Haonan:

"You are right, we can be better than them, but in terms of aerodynamic simulation... Among other things, the software we use is written by French and Americans."

In fact, it is very normal for people living in this era to have this kind of thinking.

Be it Yao Mengna or Lin Shikuan, their patriotism may not be any worse than that of Chang Haonan.

But feelings are one thing, reality is another.

In the face of a huge gap, one blow after another can easily make people lose hope.

But Chang Haonan can become that hope.

"Software, after all, is just a tool." He shrugged and replied: "Those who make tools are not necessarily the best at using them, just like those of us who make airplanes may not necessarily know how to fly airplanes."

After a pause for a few seconds, he continued to add:

"But what you said makes sense. After all, other people's tools are not the most handy. Sooner or later, we can also use our own tools."

Reasonable and well-founded.

Lin Shikuan nodded after hearing this:

"Well, I hope you are right. If you need help with anything during this period, just let me know. Our entire digital design team will listen to you."

Of course, Chang Haonan was not prepared to be polite to the other party. After all, he was still counting on gaining more management experience through these people.

"The two of us can do the flow field simulation itself. Your task is to follow the idea mentioned by Yao Bo the day before yesterday and produce the digital structural diagram of the entire aircraft as quickly as possible. This will greatly improve the performance of the wing when it is improved later. efficiency."

In the original timeline, the J-8F added an additional pair of wing blades in order to straighten out the turbulent flow field on the wing surface after carrying bombs. From an engineering point of view, this was of course the method with the least impact on the overall design. Later, The Americans encountered the same problem when developing the EA18G. The solution was to simply add a pair of wing knives.

But that doesn't mean there aren't better solutions.

A better plan means more changes. If digital design methods are not adopted, the delay in project progress will be very serious.

"We must do it as soon as possible."

When Lin Shikuan said this, he hesitated.

After a few seconds, he turned around and walked back in the opposite direction.

"Eh? What are you doing?"

Yao Mengna, who was walking together, didn't react for a moment.

"Go to work overtime."

"This……"

Yao Mengna looked at Lin Shikuan who was gradually walking away, and then at Chang Haonan next to her.

"Aren't we going along?"

The latter simply shook his head:

"I know the progress, and calculation and simulation rely on inspiration, so I have to have a good rest."

……

Three days later, when a J-7 aircraft borrowed by Yang Fenghao landed on the runway of Beiling Airport, Chang Haonan also handed over the calculation results of the wing flow field to the former's hands.

This speed almost caught the team responsible for the project by surprise - no one expected that the simulation results would be available within three days.

In fact, this is because two people spent one day converting the numerical results output by the computer into a more intuitive flow field distribution map, otherwise two days would be enough.

Yang Fenghao looked at the simulation results in front of him and took a deep breath:

"Change the schedule and test the flight earlier!"