Chapter 187 J-7, Super Evolution! (2-in-1)

On the plane, Chang Haonan, who finally had some free time, covered himself with a blanket and took a glass of juice from the flight attendant in military uniform.

Yao Mengna went back to school directly and did not go to Chengdu with her——

Since it is a project, desk work such as year-end summary must be indispensable.

And with his current status, he definitely doesn't have to do these tasks himself.

I can only work hard for my senior sister.

So Chang Haonan, who had nothing to do, was ready to summarize his gains during this period.

Due to the smooth development of the Seiko Project and the putting into use of abrasive flow processing equipment, Factory 112 and 601 were able to legitimately take out a sum of 60,000 yuan from the project funds as a commission and reward him personally.

In addition, before leaving, Yang Fenghata came to him specifically and said that the awards given by the head office were not enough to convince the public, and he would continue to apply for honors consistent with the latter's contributions.

Although Chang Haonan would not change his plans because of these external things, he had to admit that Yang Fenghao was obviously good at winning people's hearts.

After the August 3rd Project achieved phased results, the 112th Factory and the 601st Institute in Shengjing were not only engaged in Project 11th, a major project involving at least 3-4 sub-models, but they were also working on a stealth flying-wing drone. Human and machine conduct technical pre-research.

This is a self-funded project. Compared with the J-7F, the funds are certainly much more generous, but considering its rather ambitious goals, it is not difficult to predict that it will face many difficulties.

And if we can get the help of a strong foreign aid, the progress of these two projects will obviously be accelerated a lot.

In addition to material rewards and that trivial commendation, for Chang Haonan, what is more important is the system.

Perhaps because the Seiko Project created too much noise, this time he directly obtained up to 125 scientific research points, as well as a large amount of experience points, especially in management:

[Research points: 500

Theoretical level: LV2 (3500/10000)

Engineering experience: LV2 (1000/10000)

Management ability: LV2 (0/10000)

Comprehensive ability: LV2

Projects in progress: 0

Projects that can be carried out: 2]

After the theory, engineering and management levels were all upgraded to level 2, the comprehensive capability assessment of the system was also upgraded by one level.

The visible benefit is that now two projects can be carried out simultaneously.

But Chang Haonan still remembers that when he was just reborn, he once thought about letting the system help design a J-20 with some mischievous thoughts.

The response I got at that time was [the ability level is insufficient and there are no available ideas for the project]

In other words, in order to carry out a project, in addition to having a closed-loop and feasible idea, there are also requirements for the level of the system.

But later on, his research was always more down-to-earth, so he never saw the same prompt again.

But as he gradually begins to be exposed to more advanced research content represented by third-generation aircraft, the improvement of comprehensive capabilities will obviously bring many benefits.

…

A few hours later, Tu-154 landed on the runway of Chengdu Shuangliu Airport.

Chang Haonan naturally has feelings for Sichuan Province, where he lived and worked for more than ten years before his rebirth.

But he has actually not been to Rongcheng very often. Instead, he has been to mountain cities that have not yet been upgraded to municipalities.

Fortunately, the 611 Institute directly sent Lu Yuying to pick him up.

When Chang Haonan was led by the other party and saw the car that looked almost identical to the BJ212 Jeep, except that the tail was slightly longer, he couldn't help but sigh that there might be some kind of tacit understanding within the aviation industry system.

Unexpectedly, after Lu Yuying heard his thoughts, he smiled and waved his hands:

"Comrade Xiao Chang, you may have made a mistake this time. This is not a BJ212."

"oh?"

Chang Haonan's understanding of cars basically stops at a few well-known brands.

But after all, the road to the 611 Institute is not close, so he really needs some topics to kill time, and it is not difficult to guess from the other party's tone that this car may have come from a third-tier factory in the past. It was a period that he had never experienced but was quite interesting. I am interested in history, so I don’t mind hearing an introduction related to it.

Lu Yuying patted the bridge in front of him, turned around and explained to Chang Haonan:

"This car is called JC121A. It is produced locally in Sichuan Province under the Yema Bailu brand. It is a replica of the BJ121. Many official cars in the province are of this model, or the better JC212."

"Local production... Could it be your 611 Institute or 132 Factory..."

As Chang Haonan spoke, he tightened his coat tightly.

This car, which looked to be quite old, was leaky when running. It also had no heating equipment, so it had to rely on people to withstand the humidity and coldness of the Sichuan winter.

Of course, he was used to this kind of climate in his previous life, but this body was still not used to it since it was his first time to spend the winter in the Yangtze River Basin.

"That's not true."

Seeing his appearance, Lu Yuying took out a pair of gloves from nowhere and handed them over, motioning to Chang Haonan to put them on:

"The Yema Bailu was led by Chengdu Auto Repair Factory and worked together with four automobile manufacturing and maintenance companies. However, Factory 132 produced some parts for them in the most difficult years."

"Before the 1990s, the development momentum of light vehicle factories has always been good. Unfortunately, in recent years, good foreign cars have continued to come in, and joint ventures have been established to produce them. The prices have also become lower and lower. It has been difficult to sell such low-end brands. ”

For Chang Haonan, this kind of thing is not new. After all, similar plots will continue to be played out in the next ten years.

Moreover, judging from his experience along the way, the quality of this Mustang and Egret car is indeed unflattering.

For areas that do not directly affect national security, some things should be let go.

China's automobile industry must develop, but Chang Haonan's own energy is limited and he cannot do everything himself. He can only rely on channels such as the Seiko Plan to spread the technological achievements of cutting-edge projects faster.

As for who can take advantage of this wave of technological dividends, it all depends on their own efforts and luck.

After all, the fate of a factory must not only consider its own struggles...

Chang Haonan and Lu Yuying chatted about various things about this car, Chengdu, and the aviation industry, and finally arrived at the 611 Institute before the sun set.

"Now the comrades in charge of Project No. 10 are following the final assembly of Prototype No. 01 in Factory 132. The place is a little deserted, but our J-7F project team is here, and we have arranged a simple reception for you, Comrade Xiao Chang. ceremony."

Perhaps he was worried about being rejected, so the latter continued:

"In addition to our 611 Institute and 132 Factory, there are other fraternal units involved in the project, especially comrades from several factories in Zhucheng, who all came here specially."

"I also want to meet the comrades who built the city. It was not easy for them."

Chang Haonan nodded slightly:

"But I still want to go to my accommodation first and pack my luggage."

If you just look at the map, Zhucheng does not seem to be much more remote than Chengdu. However, due to a series of factors such as history and topography, the economic level of the former is much lower. The 648 and Guizhou are both products of third-tier construction. Fei (the merger of 130 Yunma Factory and 162 Shuangyang Factory) naturally has less satisfactory development than its brother units.

At present, we can only rely on the JJ-7 model to maintain the production line and research and development capabilities without interruption.

Therefore, when Lu Yuying proposed the export-oriented J-7 improved plan, the city builders chose to join in almost without hesitation.

Considering that most of the future production capacity of Factory 132 will probably be placed on the production of J-10, Guifei Factory has a good chance of getting the production task of the new J-7 model, and Institute 648 can also use this project to train its team.

In this most difficult moment for the military industry, only by finding a way to survive can we persevere until we see the light of day.

"No problem, I'll take you there right away. The conditions are definitely no worse than those at 601."

Lu Yuying patted Chang Haonan on the shoulder, and then motioned to the driver to drive towards a side road.

…

The dinner was held in the 611 guest house.

The scale is not large, at least not as much as after the successful test launch of Thunderbolt 11.

After all, it was a celebration.

Unsurprisingly, not long after the banquet started, after Lu Yuying introduced Chang Haonan to everyone, the topic at the scene gradually turned to aircraft design.

"Comrade Chang, we saw the turbojet 14B engine just shipped from Shengjing yesterday. Can you tell us about the difference between it and the old model in terms of inlet matching?"

The one who spoke was an engineer from Liyang Factory.

He had met Chang Haonan before when he was doing high-altitude platform testing at 624.

As one of the participants and investors in the research and development of the J-7F, Liyang originally hoped to use its own turbojet 13FII engine as power.

But after seeing the turbojet 14 ground test with their own eyes, they immediately realized that it was a new model that could make a leap in aircraft performance.

But to recognize the reality clearly is to recognize the reality clearly, and there is still a certain degree of unwillingness.

"It's mainly in the transonic range and the overflow resistance of the inlet."

Chang Haonan put down the cup in his hand and explained to the other party:

"In order to improve the overall performance of the engine, the final turbojet 14 engine has a boost ratio of 18.6, which is basically between a typical turbojet of less than 15 and a typical turbofan engine of greater than 20."

"Since the main installation target of the turbojet 14 was initially determined to be the J-8C with a high-altitude and high-speed orientation, the jet velocity was increased by increasing the temperature in front of the turbine and redesigning the afterburner to maintain its operating condition of more than twice the speed of sound. The performance is at the cost of using a large amount of new materials, but the lifespan is almost no improvement compared to the old model.”

"However, the designed maximum speed of the J-7F aircraft is only about Mach 2.1. It is assumed that under combat conditions, the speed is mostly in the subsonic to transonic range. An excessively high jet speed is meaningless for our model, so I It was specifically requested that when designing the turbojet 14B in 606, the temperature in front of the turbine and the jet velocity were reduced in exchange for longer life, higher reliability and lower fuel consumption.”

"But there was a problem. The original inlet was designed by me based on the flow characteristics of the turbojet 13F engine. It was too big for the turbojet 14B. The air flow captured by the inlet lip was even larger than The sum of the flow rate and the exhaust volume required by the engine will push out the positive shock wave at the lip, causing the intake duct to work in a subcritical state for a long time, resulting in a large overflow resistance."

"I wonder if I made it clear?"

His explanation was concise and to the point, and in just a few sentences he explained the next step that needs to be optimized for the J-7F.

In fact, it is not impossible for the 611 Institute to complete this work alone, but it requires a little exploration of the appropriate starting and matching sweet spots, which is far less efficient than Chang Haonan, who understands the air intake characteristics of the aircraft and engine at the same time.

After all, we still have to rush to the first flight node.

The engineer who just asked the question didn't want to embarrass Chang Haonan, so he simply nodded, then raised his cup and gestured to Chang Haonan.

"In this case, Comrade Chang..."

Another young engineer from the 611 Institute spoke.

"Just call me Chang Gong."

Among people of roughly the same generation, Chang Haonan is still more accustomed to this title.

"Okay, then Chang Gong, since the key to the inability to match the old intake duct and the engine is that the intake air flow is too large, can we directly design a few vent holes to increase the air bleed volume of the intake duct?"

"No, of course not."

After hearing this question, Chang Haonan shook his head solemnly, then looked around and found a blackboard in the corner of the scene. He walked straight over, picked up the chalk and drew an abstract entry on it. Airway diagram.

The reason why he paid so much attention was because he remembered that his previous research on the mandibular airway had suffered a lot of setbacks here.

"In the subsonic state, there is no problem with the method you just said, but in the transonic range, the normal shock wave of the inlet wave system is located outside the inlet lip, between the free flow tube boundary and the wedge plate surface , can’t reach the position of the air vent at all.”

"If it were an adjustable air inlet like the J-8C, it would not be a big problem, but the shape of the air inlet of the J-7F is fixed and there is no way to adjust it according to different speeds. The entire air intake structure design must be optimized."

Chang Haonan put down the chalk and turned around. What he saw was a group of people either bowing their heads in deep thought or looking suddenly enlightened.

By this point in the banquet, it had already begun to look like a technical seminar.

In order to make the atmosphere less bad, Chang Haonan put on a more relaxed expression and tone:

"Besides, don't you think the previous design was a bit too ugly? It's like... a toad with a big mouth."

"After switching to the new design, although the overall appearance is still the same,... at least the mouth is not as big as it is now, and it needs to be coordinated a lot."

This description immediately enlivened the atmosphere at the scene, and some people laughed involuntarily after hearing it.

In fact, the design of the mandibular air inlet is indeed inferior in aesthetics, but models such as the J-7F and the US military's F8 and A7 are fine.

What really breaks through the lower limit of aesthetics is the X32 fighter jet that has not yet come out, which is the technology demonstrator launched by Boeing to bid for the JSF project.

Toad's mouth is also used to describe this model.

The X32 ultimately lost to Lockheed Martin's X35. One of the very important factors was that pilots from the three services expressed their unwillingness to fly such an ugly aircraft into the sky, which would affect morale too much.

Lu Yuying also raised his wine glass very appropriately at this time:

"Then I wish our new model can evolve successfully with the help of Comrade Chang Haonan!"

"Evolution successful!"

Everyone present echoed in agreement.