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 workshop to prepare for modification.
They don't have much time left. 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 H-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 is similar to the Challenger 601 business jet he took when he came to Haojing a few days ago.
A special plane for VIPs 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 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.
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.
What came out of the plane turned out to be a group of old acquaintances.
"Senior sister? Forest engineer?"
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 walked down the gangway quickly, stretched out his hands and shook hands with Chang Haonan:
"Happy New Year, Dr. Chang, I'm so happy again I can work with you.”
Among the aviation industry employees who have worked with Chang Haonan, only Lin Shikuan always called him Dr. Chang because of his habit at the beginning, and he was obviously interested in it. He has more respect.
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 been working together since Chang Haonan and Yao Mengna arrived at No. 601 Institute. From a disgusted semi-abandoned child to 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.
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, and directly transferred Lin Shikuan, who had no urgent tasks for the time being, and others came to support him.
As for this Boeing 737 special plane...
If combined with the Challenger 601 that sent him here, it does have some profound meaning——
Previously Chang Hao When Nan himself came here, 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 both transports of personnel.
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? To be honest, our China Aviation Industry is not a family..."
Lin Shikuan said, followed by Chang Haonan and Yi Yuanhe Walking behind me towards the office building of Factory 172.
His words were not entirely polite. At least Chang Haonan had seen in his previous life that when Institute 601 held celebrations, many big bosses 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 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 also arrived at the office space prepared for them.
Lin Shikuan turned to Chang Haonan again:
"Chang Gong, you will assign work to all of us next."
"Is this..."
Chang Haonan briefly analyzed the current situation:
For him, it is not difficult to design the planar nozzle array, and there are also designers from the 603 Institute To help, as long as some key parts are sorted out, the rest of the numerical simulation part only needs to be let the computer run by itself.
On the contrary, the analysis of wing icing conditions and aerodynamic effects under SLD conditions requires more people to complete.
"Let's go to the design room first. I will briefly explain the current situation to you..."
Afterwards, Chang Haonan spent about 10 minutes introducing the two tasks before him.
Of course, I only talked about the need to design a new icing water sprayer and modify the MA 60 to adapt to harsher climate conditions. The construction period is very urgent and must be completed within a week, but I skipped it. All aspects related to China-EU negotiations.
It’s not that I don’t trust Lin Shikuan, Yao Mengna and others.
It’s just not necessary.
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 MA60 work."
After hearing the work arrangements, Lin Shikuan reached out and pushed up his glasses, and asked hesitantly:
"There is no problem in improving the design, but. ...After the design is completed, we still need to manufacture it. Is one week really enough?”
“Of course it’s not enough to make a new one.”
Chang Haonan replied simply:
"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."
"Because time is limited. , 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 and behind the slats. The scale of the standing vortex becomes larger, and the lift coefficient is reduced by 54.6% within 180 seconds of ice formation. The ice on the winglets causes the flutter characteristics to change. The effect of the previously designed active flutter system is weakened, and the flutter speed directly decreases. It has been reduced by 15%.”
“No matter how good the de-icing system is, it cannot be saved. Therefore, if you want the aircraft to fly normally under extremely harsh conditions, you must use the previous one which is more reliable. The conservative wing just needs to be modified by Factory 172.”
They are both SLDs, so there are differences.
Both droplets with diameters of 100 microns and 1,000 microns are 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 whole aircraft icing test method to verify the icing conditions of supercooled large droplets, mixed phases and ice crystals. Compliance.
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.
Improving the accuracy of weather forecasting is the right way.
If you insist on taking 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 the 603 Institute participating in the meeting collectively performed a dumbfounded performance——
< br>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 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 will go to the computer room to talk in detail later."
Lin Shikuan, who was already not surprised by this, immediately curled his lips and thought, you young comrades from the 603 Institute still don't see each other very often. , Chang Gong was so shocked before he showed his most inhuman side...
Too young!
(End of this chapter)