Chapter 611 J-10A and J-10E
“Xiao Chang, due to the weather in Qian Province, comrades from Guizhou Aviation Industry said they would not be able to come over until tomorrow, so our seminar can only be postponed by one day. Today How about taking a look at the current progress of Project No. 10?”
After a brief greeting, Song Wencong, as the host, immediately gave the next itinerary.
The reason why we have to wait for someone from your aviation industry is because the test flight data about the DSI air inlet was tested by three J-9 prototypes, so it is all stored there.
After all, aircraft design 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 for a while, 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. It took only one or two days, 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.
One of them even includes 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 is still in production?”
Chang Haonan looked out the window and asked with slight surprise.
"It should have been discontinued, but the Sudanese Air Force lost four J-7Ns a while ago and needs to replenish its establishment."
Xu De, deputy chief engineer of the 132 Factory, sitting in the row behind Chang Haonan, replied road.
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 many business exchanges during the first ground test of the J-10, 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 over there, but the other party really can’t afford the money, and we happen to have a few J-7II aircraft here. , I dismantled the identification friend or foe device and the alcohol anti-icing device, and prepared to dispose of them directly as scrap metal. "
In Africa in the 1990s, there was even an environment where large-scale famines could occur. For real people. For third world countries, it is obviously not easy to save money to buy a few new aircraft.
"But speaking of it, what did the Sudanese Air Force do to lose four aircraft at once?"
In Chang Haonan's impression, the other party should only be equipped with a dozen or twenty J-7s and MiG-21s. The number of them that can fly must be smaller, and they can crash four at once...
It can't be that they collided with each other 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 Wenchong shook his head and replied in a slightly helpless tone:
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"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 1990s 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. come out.
Even Chang Haonan, a reborn person, would not have known about such a thing if he had not 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 time, 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...
It is indeed 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 have no idea about the so-called "support for KB doctrine". It's not serious.
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 these things are connected...
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 seems that they have no intention of changing their development strategy because of this matter.
But even so, it is 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 worried.
......
As thoughts swirled, the minibus finally drove to the other side of the tarmac.
Everyone got off the car one after another.
The two J-10 prototypes are parked here.
The surface of one of the frames 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 reinforcing ribs on the air intake 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 visible changes, there are not many, only some details such as the landing gear doors.
The main thing should 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 shock waves at different locations. The pressure gradient changes, and the tendency of boundary layer separation becomes stronger."
Song Wenchong stood at the entrance of the air inlet and stretched out his hand to mark the position of the upper partition:
"In this case, the J-7F's mandibular air inlet does not exist because it is located forward."
"At present, whether it is a binary adjustable air inlet or a pitot tube inlet, both The air inlet is designed at a distance from the belly, so it can avoid the shock wave position. "
"But if it is a DSI air inlet, the bow shock wave will inevitably face the air intake. The gas conditions will have an impact and further degrade the 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 is really not easy to solve this problem solely by the bulging design of the DSI air intake.”
Chang Haonan patted some dust on his hands just because he touched the air intake. :
“So it may be necessary to add a few vortex generators to the lower edge of the inlet to interfere with the generation of this bow shock wave in advance.”
As he spoke, he raised his hand to signal. Above the air intake of the plane in front of me:
"The principle is somewhat similar to these six reinforcing ribs. The structure is very simple, but the design requires some computing power."
"When the comrades from Guihang Airlines bring the test flight data of the JJ-9 tomorrow, we will Let’s think more about it later.”
(End of this chapter)