The military-industrial scientific research system of the academic master.

No one knows how many phone calls Ding Gaoheng made that night and how many people he woke up from their sleep.

In short, on the afternoon of the next day, a newly delivered Hongyou-6 landed on the runway of Yanliang Airport, and was quickly dragged into the assembly workshop to prepare for modification.

There was not much time left for them. Fortunately, the aircraft already had complete pipelines and control systems, and this part only needed to be slightly improved.

To Chang Haonan's surprise, a little later than the arrival of Hongyou-6, another Boeing 737-300 slowly appeared on the horizon.

Flying here from Shengjing.

Although at first glance it looks similar to the painting of most civil aviation aircraft, there is a parallelogram-shaped national flag painted on the vertical tail.

It was similar to the Challenger 601 business jet he took when he came to Haojing a few days ago.

A special plane for important personnel of the Air Force 34th Division.

"Is there a leader coming?"

Chang Haonan, who had just completed the on-site inspection of the H-6 in the assembly workshop, was confused for a moment.

The standards of this negotiation are indeed very high, but even based on the principle of reciprocity, Huai Guomo's level is definitely enough, and there is no need for a higher-status figure to show up in person.

Moreover, the security level around the airport is completely different from that at Beiling Airport.

His doubts were quickly answered as the Boeing 737 landed and began taxiing a few minutes later.

What came out of the plane turned out to be a group of old acquaintances.

"Senior sister? Forest worker?"

Chang Haonan quickly recognized the two people who walked out of the cabin first.

One of course is Yao Mengna, whom I haven’t seen for more than a month.

The other one is the leader of the digital design team, Lin Shikuan, who was led by Chang Haonan and his colleagues for several months when they were in Institute 601, and now can barely take charge of his own role.

"Dr. Chang!"

After seeing Chang Haonan, who was wearing an aviation industry overalls and a cotton-padded jacket, standing not far from the parking space, Yao Mengna couldn't help but smile. However, she still remained a little reserved and only sped up her pace slightly.

But Lin Shikuan didn't pay that much attention. He quickly walked down the gangway, stretched out his hands and shook Chang Haonan's hand:

"Happy New Year, Dr. Chang. It's a pleasure to work with you again."

Among the aviation industry employees who had worked with Chang Haonan, only Lin Shikuan always called him Dr. Chang because of his initial habit, and he obviously respected him more.

On the one hand, the two of them have been working together for significantly longer. On the other hand, Lin Shikuan and his entire digital design team have also grown from semi-abandoned children that even the cafeteria aunts disliked after Chang Haonan and Yao Mengna arrived at No. 601. Now there is a rising star in the entire institute.

It can be said that Lin Shikuan's entire life has changed because of Chang Haonan.

"Junior brother, long time no see. Happy New Year."

Yao Mengna also walked down later, but almost subconsciously stood opposite Lin Shikuan, side by side with Chang Haonan.

"Happy New Year to you too, senior sister."

Behind the two people were more than two dozen engineers from the 8 Institute who had participated in the improved design of the J-601C.

Now Chang Haonan finally understood.

It should be that the Science and Technology Commission played a role. It was worried that the strength of the 603 Institute alone was not enough to complete the research and development of the H-6AIT aircraft and the improvement of the anti-icing system of the MA-60 in such a short period of time, so it directly transferred the research and development of the H-AIT aircraft and the improvement of the anti-deicing system of the MA-. Lin Shikuan and others came to support him.

As for this Boeing 737 special plane...

If combined with the Challenger 601 that was sent to me, it does have some profound meaning——

When Chang Haonan came here before, he didn't know exactly what he was going to do. He was arranged to take off from the military part of the Twin Towers Airport and take a specially dispatched business jet. He just felt a little flattered.

However, no aircraft from the civil aviation system was rented for transporting personnel on both occasions.

Obviously there are confidentiality considerations.

Although Chang Haonan has always been far away from the world, he knows very well that the development of the aviation industry is not only a technical issue, but also a route issue.

Judging from the current situation, Ding Gaoheng and the Science and Technology Commission system are obviously better.

For him, this result is obviously a reassurance.

At this time, Yi Yuanhe also stepped forward and thanked the fraternal units for their support on behalf of the entire Haojing factory.

"Mr. Yi is so polite. Why don't you thank me? After all, our China Aviation Industry is not a family..."

Lin Shikuan said as he followed Chang Haonan and Yi Yuanhe towards the office building of Factory 172.

His words were not entirely polite. At least Chang Haonan had seen with his own eyes in his previous life many big bosses from 601 and 603 when Institute 611 held celebrations.

In the 90s, the first group of people involved in the aviation system had not all retired, and the relationship between them was actually closer.

Besides, the Science and Technology Commission has already come forward to coordinate, so how can we not give face?

This is the advantage of using your energy in one place.

After the greetings ended, the group arrived at the office space prepared for them.

Lin Shikuan turned to Chang Haonan again:

"Chang Gong, you will be the one to assign work to all of us."

"Is this..."

Chang Haonan briefly analyzed the current situation:

For him, it was not difficult to design the planar nozzle array. Moreover, with the help of designers from the 603 Institute, as long as he sorted out some key parts, the rest of the numerical simulation part only needed to be run by the computer.

On the contrary, the analysis of wing icing conditions and aerodynamic effects under SLD conditions requires more manpower to complete.

"Let's go to the design room first. I'll briefly explain the current situation to you..."

Afterwards, Chang Haonan spent about 10 minutes introducing the two tasks before him.

Of course, they only talked about the need to design a new icing water jet and modify the MA 60 to adapt to harsher climatic conditions. The construction period is very urgent and must be completed within a week, and the issues related to the China-EU negotiations were ignored. All parts.

It's not that they don't trust Lin Shikuan, Yao Mengna and others.

It's just simply unnecessary.

The fewer people who know about this before the negotiations are finally settled, the better.

"So my arrangement is to leave three to four people to help design the flat nozzle array and change the original refueling control system to a water spray control system. Lin Gong, Senior Sister Yao, and the remaining comrades need to Help improve the work of MA60."

After Lin Shikuan heard about the work arrangements, he stretched out his hand to push up his glasses and asked hesitantly:

"It's okay to improve the design, but... after the design is completed, you still have to manufacture it. Is one week really enough?"

"It's certainly not enough to make new ones."

Chang Haonan replied simply and neatly:

"But I have done some small calculations last night and found that when the lift-increasing drag-reducing airfoil encounters large-grained supercooled water droplets, the lift coefficient decreases more significantly."

"Due to limited time, I only tested it once with 100 microns and 500 microns. The result was that it was fine at 100 microns, but at 500 microns, the ice on the leading edge slats made the flow boundary layer on the upper surface thicker. Moreover, the size of the resident vortex behind the slats becomes larger, and the lift coefficient decreases by 180% within 54.6 seconds of ice formation. The ice formation on the winglets causes the flutter characteristics to change, and the effect of the previously designed active flutter system weakens. The flutter speed is directly reduced by 15%."

"No matter how good the de-icing system is, it can't save this situation. So if you want the aircraft to fly normally under extremely harsh conditions, you have to use the previous more conservative wing. As long as the 172 factory is on it Just renovate it.”

They are both SLDs, but they are also different.

Droplets with diameters of 100 microns and 1000 microns are both called SLD, but their effects on aircraft are obviously completely different.

The reason why Chang Haonan wanted to simulate conditions of 500 microns or even higher severity was to show off his skills in the faces of Europeans, so he did not hesitate to modify the aircraft specially for this purpose.

As for the model that is truly market-oriented, it will naturally use the new wing.

Unless a customer explicitly requires flying in extremely bad weather.

That is the scope of the special aircraft business, and such users can naturally accept the corresponding performance loss.

In fact, in the previous life, even before Chang Haonan was reborn, no aircraft in the world could pass the entire aircraft icing test method to verify the compliance of supercooled large droplets, mixed phases and ice crystal icing conditions.

Therefore, the normal configuration combined with the Category 4 anti-icing capabilities in Chinese standards is absolutely sufficient to cope with normal flight conditions.

The Americans are just making cards out of thin air now.

Improving the accuracy of weather forecasts is the right way to go.

If you have to take off in a snowstorm with high humidity, even the gods will not be able to save you.

After explaining, Chang Haonan put down the chalk and looked back at everyone:

"Do you understand everything?"

Looking at the key data and mathematical models written by Chang Haonan on the blackboard, the members of Institute 603 who participated in the meeting collectively performed a dumbfounded performance——

Didn’t we just receive the mission yesterday?

It’s only been one night?

I thought it was just the beginning?

How come you have even compiled the preliminary research results?

Be yourself!

After a while, an engineer finally raised his hand weakly:

"Chang Gong... do you mean you already have an idea?"

Chang Haonan smiled and nodded:

"Of course, we will go to the computer room to talk in detail later."

Lin Shikuan, who was already used to this, immediately curled his lips, thinking that you young comrades from Institute 603 still don’t see much of you, and the regular workers were shocked like this before they even showed their most inhuman side...

too young!