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

"Xiao Chang, due to the weather in Qian Province, the comrades from Guihang Industry said they would not be able to come here until tomorrow, so our seminar can only be postponed for one day. How about taking a look at the current progress of Project No. 10 today?"

After a brief exchange of greetings, Song Wencong, as the host, immediately gave the next itinerary.

The reason why we have to wait for someone from your aviation industry to come is because the flight test data about the DSI air inlet was tested by three JJ-9 prototypes, so it is all stored there.

After all, aircraft design still requires a certain amount of actual measurement results, and it is impossible to rely solely on wind tunnel experiments.

Moreover, the more one comes from a computing school like Chang Haonan, the more so.

"It's okay. I've been dealing with the Taihang Project during this time, and I really haven't paid much attention to the situation on the host side."

Such a big project, no matter how urgent it is, can only be completed in a day or two, so Chang Haonan readily agreed.

In fact, when the plane landed just now, he saw through the portholes two fighter jets with distinctive shapes parked on the tarmac on the other side.

Sure enough, after simply completing some necessary procedures, the other two took Chang Haonan into a minibus and drove toward the distance.

Factory 132 is also considered a major manufacturer in the aviation industry system. Naturally, it is impossible to produce only a few J-10s. Therefore, Chang Haonan also saw many other very familiar models along the way.

They even include a J-7 equipped with a large delta wing and air intake on the nose.

You know, due to the emergence of the J-7F, even the J-7MG, which sold well in the previous generation, has almost no orders.

"The oldest J-7 model is still in production?"

Chang Haonan looked out the window and asked slightly surprised.

"Originally, production was supposed to have been discontinued, but the Sudanese Air Force lost four J-7Ns a while ago and needs to replenish its strength."

Xu De, deputy chief engineer of Factory 132, who was sitting in the row behind Chang Haonan, replied.

He is also the deputy chief engineer responsible for the final assembly and production tasks of the No. 10 Project. He and Chang Haonan had a lot of business exchanges during the first ground test of the J-, so they knew each other.

"We suggested that they directly buy the J-7F or at least the J-7MG, which is more suitable for the low-altitude ground attack mission there, but the other party really couldn't afford the money. We happened to have a few J-7II airframes, so we put the identification friend or foe device on them. The alcohol anti-icing device has also been dismantled, and we are going to dispose of it directly as scrap metal."

In the 90s, Africa could even experience large-scale famine. For a truly third-world country, it was obviously not easy to save money to buy a few new planes.

"But speaking of which, what did the Sudanese Air Force do to lose four aircraft at once?"

In Chang Haonan's impression, the opponent should be equipped with only a dozen or twenty J-7s and MiG-21s in total. Among them, the number that can fly must be even less, and four of them can fall at once...

They couldn't have collided while flying in formation, right?

"We don't know much about the specific situation. We only know that things are not peaceful there recently..."

Song Wencong shook his head and replied with a slightly helpless tone:

"The separatist forces in the south are making a lot of noise. I heard a few days ago that the Americans launched two air strikes on the grounds that they support the KB elements. I guess that's how the planes were lost..."

After the end of World War II, the 90s was the most difficult period for many small countries.

The situation that the United States is the world's dominant player cannot change in a short time. In addition, the Internet era has not really arrived after all, so small-scale air strikes like this will not even be reported in the news.

Even Chang Haonan, a reborn person, would not have known about such a thing if he hadn't asked about it by chance.

"This kind of thing... is beyond our reach..."

Yang Wei, who was sitting in the same row as Chang Haonan, also sighed.

At this moment, China itself has to continue to make concessions to the United States in many places. After the disintegration, Mao still has the unreasonable idea of ​​trying to join NATO, so...

There really is no way.

Some things just don't make sense.

If you fall behind, you will be beaten.

This is why we must build a strong military even if we focus on economic development.

"I just don't know where Sudan offended the United States this time..."

Obviously, these people sitting in the car did not take the so-called "support of KB doctrine" seriously.

However, this unintentional remark made Chang Haonan suddenly think of it.

At the end of last year, Yan Zhongcheng was designing a turbojet 14 aeroderivative gas turbine for natural gas power generation for an oil and gas field project in Sudan.

The reason why there was such an urgent project was that General Electric suddenly stopped supplying the LM2500.

The superficial reason is that China may obtain spare parts for its naval LM2500 gas turbine through this order.

But in fact, it was because Sudan suspended Chevron’s oil field exploration and mining rights in the southern part of the country in 1994.

And if you connect these things...

It seems that it is not difficult to explain.

It is well known that petroleum can breed mold.

Fortunately, at this time, due to the Black Hawk crash, Americans still have a lot of psychological shadow on the Horn of Africa, so they should not send ground troops there to calm things down.

After all, the leader of the other side, Omar Bashir, was a ruthless man who personally participated in the Yom Kippur War.

Judging from the fact that Sudan immediately came to Rong Fei to replenish air force equipment, it seemed that they had no intention of changing their development strategy because of this matter.

But even so, it’s not an option in the long run——

Others are taking risks and pressure to give you this opportunity, but you, in turn, cannot protect the other party's basic safety.

In this case, before anyone chooses to cooperate with you, they must be more cautious.

……

As his thoughts surged, the minibus finally drove to the other side of the tarmac.

Everyone got out of the car one after another.

The two J-10 prototypes are parked here.

One of them is wrapped in a classic camouflage tarpaulin.

The other one is marked 1003, which should be the No. 03 prototype that just rolled off the assembly line.

"Based on the data obtained during the test flight of No. 01, we made some technical adjustments to No. 03 during the manufacturing process. After all, according to our plan, this model will also go through the entire finalization process in the future."

Chang Haonan walked closer to the aircraft and took a look, and sure enough he found that the six stiffeners on the air inlet had been adjusted to look like the original mass-produced model.

In addition to reinforcement, it can also have a slight rectifying effect on the air flowing through this area.

As for other changes visible to the naked eye, there are not many changes, only some details such as the landing gear doors.

It should mainly be on the flight control system.

"In addition, during the test flight, we found that under supersonic conditions, due to the pre-compression effect of the nose on the incoming flow, the part of the belly close to the body will form a bow shock wave, causing changes in the pressure gradient at different locations. The surface layer tends to become more separated.”

Song Wencong stood next to the air intake, stretched out his hand and made a gesture on the upper partition:

"In this case, the J-7F's mandibular air inlet does not exist because it is located forward."

"Currently, whether it is a binary adjustable inlet or a pitot tube inlet, the inlet is designed at a distance from the belly of the aircraft, so it can avoid this shock wave position."

"But if it is a DSI inlet, this bow shock wave will inevitably have an impact on the air intake, further degrading supersonic performance..."

Obviously, after determining the improvement plan for the J-10, Rongfei has already started some technology research and development work in advance.

As a fighter jet, although inferior supersonic performance is acceptable, it cannot be too outrageous.

Especially when the supersonic orientation of the turbofan 10 is specially optimized, it would be a bit of a loss if defects occur in the design process of the aircraft body.

“It’s really not easy to solve this problem just by relying on the bulging design of the DSI air intake.”

Chang Haonan patted some dust on his hands that had just been touched by touching the air intake:

"So it may be necessary to add several vortex generators to the lower edge of the inlet to interfere with the generation of the bow shock wave in advance."

As he spoke, he raised his hand and gestured to the air inlet of the aircraft in front of him:

"The principle is somewhat similar to these six reinforcing ribs. The structure is very simple, but the design requires some calculations."

"When the comrades from Guizhou Airlines bring over the test flight data of the JJ-9 tomorrow, we will make specific considerations."