The avionics level of the Thunder Dragon is far more than that of the J-10, in fact, now the main thing is to send radar and other equipment, Lao Ba is not at ease with the domestic equipment, and wants to choose European products, and his own side, as long as the J-10 radar is transplanted over, the size of the nose of the two is different, as long as the size of the radar antenna is reduced.

It's not just for J-10, even if it's for J-11, it's completely okay, as long as the radar antenna is made bigger, it's completely your own technology, you can do what you want, in fact, now on the basis of the 1473 radar, there is a modification of the 1491 radar, the radar caliber has been expanded to 900 mm, which is prepared for the J-11.

Of course, it still takes a certain amount of time for J-11 to really use domestic avionics, and the action in Shenyang has always been unfast.

Qin Feng sat on the plane for a long time, and he was reluctant to get down, it is conceivable that this kind of avionics brings greater convenience to the pilot, and can allow the pilot to have better energy to devote to the battle.

After getting off the plane and going around the plane, Qin Feng came to the air intake of the plane again, and in the development stage of this aircraft, the choice of air intake was also a difficulty.

The nose air intake is definitely not needed, the air intake on both sides is commonly used by the second generation machine, this air intake is relatively simple, the changes to the fuselage are small, but the performance is still defective, when making sharp turns, it will block the air intake on one side, and at the large angle of attack, the efficiency is not high.

The belly air intake is a more suitable layout of the third-generation aircraft, many third-generation aircraft are used in this way, however, this requires the nose to be raised, and the rear fuselage is in two planes, at the same time, the belly air intake also has higher requirements for the ground, easy to inhale debris, so, not all aircraft can be satisfied, and now this scheme can be said to be a good compromise.

Air inlet with two partitions with a surface layer.

The surface layer is a very complex knowledge in aerodynamics, also known as the boundary layer, under high-speed movement, when the fluid is close to the solid surface, due to the viscosity of the fluid itself, it sticks to the surface for flow and forms a boundary layer. This is somewhat similar to the water in a river, and you can see that the speed of the water is different in the middle of the river and at the edge of the river, which is the viscous resistance.

This is also the case in airplanes, where the normal velocity is almost zero at the part where the surface of the fuselage is close to each other.

In other positions, this does not matter, but in the place of the air intake, it is quite inappropriate, because the speed of the layer close to the surface of the fuselage is too slow, so the engine can not suck in enough air, and at the same time, in this place, it is easy to separate the airflow, resulting in turbulence; Turbulence can further deteriorate the engine's performance, causing the engine to surge or even stop in the air.

Aircraft designers must solve this problem, the common is the attached surface layer partition, the engine air intake and the fuselage are separated through the partition, you can see the upper lip dragged by the villain of the air intake of the J-10, it is this attached surface layer partition, F-16 also has, F-18 also has it, F-15 air intake is originally far away from the fuselage, so don't think about it.

The basic principle of this partition is to separate the turbulence generated by the surface layer, and this air intake must be at a certain distance from the fuselage, which is the gap we see. At the same time, this partition can also have another use, adding an adjustable inclined plate, through the inclined shock surface generated in front of the inclined plate, to slow down and compress the supersonic incoming flow. This is the adjustable air intake, which is adjusted by the angle of the inclined plate to adjust the intake volume and intake air match at different Mach numbers.

For aircraft engines, different speeds require different amounts of air, and if they are not adjusted, they can only optimize performance at one speed, and the others will be affected.

For example, the F-16 uses a fixed air intake, although it can theoretically fly to Mach 2, but in fact, after exceeding Mach 1.6, the drag brought by the speed surges, making it accelerate very slowly in the second half of the road, which is an old bull broken car, and the J-10 uses an adjustable air intake, so it almost does not take much effort to accelerate to Mach 2.

It's just that this adjustable air intake is too heavy.

"Now, the first few prototypes use this kind of partition air intake, but the later prototypes may use new technology." Saad said, "Qin, have you ever heard of the DSI air intake? ”

At the same time that the F-22 was secretly built by the United States, the Americans are also planning to develop a universal combat force, just like the F-16, which can be exported to allies in large quantities, as a low-grade aircraft for the F-22, this project has also been going on for ten years, and now there are preliminary results.

This bulge, the scientific name is called the supersonic air inlet without the surface layer partition, it has many benefits, the partition is canceled, there are no moving parts, the structure is simple, the weight is light, especially because the drum comes out, so the fan blades of the turbofan engine behind have a certain blocking ability, and the stealth effect is better.

However, this kind of inlet is not easy, it seems to be a bulge, in fact, this bulge is very knowledgeable, it requires extraordinary aerodynamic basic research capabilities, but also with supercomputer simulation and actual wind tunnel testing, this is a accurately calculated and simulated fixed shape of the bulge, which can be used as a compression surface, deceleration, compression of air and then provided to the intake; It is also possible to "blow away" the harmful surface layer with a bulge to prevent it from being sucked into the engine and causing intake mismatch.

"Of course I know, but it's not easy to develop this bulge." Qin Feng said that if you want to say that the Americans have developed to the extreme in the aviation industry, there is absolutely no objection to it, and the technology used by people is so powerful.

"Yes, it's not easy, but we are said to be studying this kind of air intake here, and it may be used in prototypes in the future." Saad said.

Do we have this technology too? Chengdu is too powerful, right? Qin Feng was immediately excited when he heard this. In the past few years, the progress made by Chengdu is really emotional, they are all heroes.

"Great." Qin Feng said: "I'm really looking forward to seeing this kind of Thunder Dragon fighter with a bulge as soon as possible, this fighter will hold up the sky of South Asia!" ”

Due to changes in the international situation, it is difficult for Lao Pakistan to obtain F-16 fighters from the United States again, so the aircraft developed by the other side is of great significance to Lao Ba, and at the same time, this aircraft will also be put into production in Lao Ba, marking the further progress of Lao Pakistan's aviation technology and becoming another symbol of friendship between the two sides.

()

1 second to remember Aishang: