The Military-industrial Scientific Research System of the Academic Master Chapter 218

Chapter 218 Already has an idea

 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 H-6 that had just been delivered landed on the runway of Yanliang Airport, and was quickly dragged into the assembly shop to prepare for modification.

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

 What surprised Chang Haonan was that a little later than the arrival of Hongyou 6, another Boeing 737-300 slowly appeared on the horizon.

 Flying 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.

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 34th Air 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 according to 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.

And 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.

 The people who walked 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 is naturally Yao Mengna, whom I haven't seen for more than a month.

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

 “Dr. Chang!”

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

But Lin Shikuan didn't pay that much attention. He walked down the gangway quickly, 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 employees in the aviation industry who have 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 of them were more than two dozen engineers from the 601 Institute who had participated in the improved design of the J-8C.

This time 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 M60 in such a short period of time, so it directly transferred the 603 institute, which had no urgent tasks at the moment. Lin Shikuan and others came to support him.

 As for this Boeing 737 special plane…

If combined with the Challenger 601 that was sent here, it does have some profound meaning -

Chang Haonan didn't know exactly what he was going to do when he came here before. 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, in both cases of transporting people, no aircraft from the civil aviation system was rented.

 Apparently 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 that when Institute 601 held celebrations, many bigwigs from Institute 603 and 611 came.

 In the 1990s, 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 stepped in 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 also 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 is not difficult to design the planar nozzle array. Moreover, with the help of designers from the 603 Institute, as long as some key parts are sorted out, the rest of the numerical simulation part only needs 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 office first. I'll briefly explain the current situation to you…”

 Then, 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 ChinEU negotiations were ignored. All parts.

 It's not that I 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 hearing the work arrangements, Lin Shikuan stretched out his hand to push up his glasses and asked hesitantly:

“There is no problem in improving the design, but... after the design is completed, we still have to manufacture it. Is one week really enough?”

 “Of course it's 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 standing vortex behind the slats becomes larger, and the lift coefficient decreases by 54.6% within 180 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.

  Droplet diameters of 100 microns and 1,000 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 there is a customer's explicit requirement to fly 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 past life, even before Chang Haonan was reborn, no aircraft in the world could pass the whole aircraft icing test method to verify the compliance of supercooled large droplets, mixed phases and ice crystal icing conditions.

 So the normal configuration combined with the Category 4 anti-icing and de-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, 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 the 603 institutes participating 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 phased research results?

 Be a human being!

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'll 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!

 (End of this chapter)

Chapter end