So the aerodynamic design of the F-4 and the Mirage 3 can be used on the fighter, and even the air inlet layout of the Mirage 3 has been extended to the Mirage 2000, which naturally proves that such an air inlet design can still be used on the fighter, but why the fighters of the third-generation aircraft era have abandoned this kind of design except for the Mirage 2000?

The reason why the F-4 and Mirage 3 will be placed on the wing with the air intake is because the design should effectively ensure the maneuverability of the aircraft, and as a fighter, it must first do its own air superiority work, so for the sake of maneuverability, it has to choose the lower wing design, and then in order to lower the single wing design, it has to choose the upper air intake. Pen % fun % Pavilion www.biquge.info

In the era of the third-generation aircraft, although the initial fighter mafia has been advocating to use the aircraft for special purposes, but as the cost of the fighter is getting higher and higher, multi-purpose is still the road of the future, so for the sake of multi-purpose combat capabilities, the problem of the wing being too low from the ground caused by the design of the single wing has always been difficult to solve, resulting in many safety problems.

It was also when the problem of the lower wing being too close to the ground was criticized, the great Northrop company discovered the role of the wing design for the first time in an accident, so the major designers began to explore and study the wing wing, and found that the wing can pull out a beneficial vortex on the surface of the wing to have the same effect as the fixed canard, which will greatly optimize the aircraft's maneuverability at the high angle of attack.

At the same time, because the side strip wing can play a good pre-compression role in the airflow flowing under the wing, even if the air intake of the third-generation aircraft is designed below the side strip, it can also have a very good air intake effect.

The advantages of the lower wing have finally been diluted by the emergence of new technologies, so since the advantages of the lower wing are no longer obvious, the design of the middle wing or the upper wing with a larger ground clearance has ushered in the dawn, and because they have a better ground loading capacity, this is naturally also very popular.

And at the same time, the abdominal air intake is also in the era of the third generation aircraft with the strong rise of the F-16, designers have more options, and the lower wing design is naturally no longer so popular.

And at this time, maybe some people will start to think about it, since the side wing is so good, and the lower wing itself also has a strong air superiority maneuvering ability, then if the two are combined, it must be a strong combination, and such a fighter will definitely beat everything when fighting air superiority!

In addition, although the design of the lower wing has a low ground clearance, it is not impossible to use it for multi-purpose, F-4, Mirage 3, Mirage 2000, these three aircraft do not all have good multi-purpose combat capabilities? The inconvenience of loading ammunition is a matter of ground support, and it will be over after a little overcoming, in contrast, it is more worthy of the designer's careful pursuit of the performance of the aircraft after it goes into the sky.

But in fact, for this kind of idea, it is simply a joke, as mentioned earlier in the design of the single wing plus the upper air intake, in order to ensure that the air intake is not blocked by the wing, the air intake has been moved forward, and now if you add a side strip wing to the front of the wing.

Think about it, the side strip wing that is closer to the front will definitely block the air intake effect of the air intake at a large angle of attack, and even more, the detachment vortex pulled out above the side strip will flow directly into the air intake, not only the vortex can not produce gain on the upper surface of the main wing, but even the vortex will be very unstable after entering the air intake, which will directly cause engine surge.

Therefore, in the era of third-generation aircraft, the aircraft with edge wing is either arranged under the side wing with the air intake, or directly arranged in the belly of the aircraft like the F-15 or Su-27, and it is difficult to see the design scheme of the lower wing and the upper air intake.

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After spending half an hour before and after giving a detailed introduction to the history, advantages and disadvantages of the design scheme of the single wing and the upper air intake, it finally caused some chain reactions on the side of Chief Song.

Looking at Chief Song's actions, it is even more incomprehensible, it seems that Chief Lu's design plan is really very meaningful! It's definitely a design that hasn't appeared in the previous one.,And I'm afraid this design is also quite good!

Immediately afterwards, Chief Engineer Lu directly asked the assistant to replace the picture projected on the big screen, at this time it was no longer the overall three-dimensional model of the aircraft, but the side view of the aircraft jumped on the screen, and after this side view was released, Yang Hui finally understood why Chief Lu had to go to such great lengths to choose the design scheme of placing the air inlet on top and moving the air inlet forward, which was too ingenious.

At this time, Yang Hui had to sigh from the bottom of his heart, saying that Hongdu is the most spiritual one of the aircraft design units of the Republic, and the design is full of the unique beauty of the Jiangnan region, just like the garden design of the Jiangnan water town, each design seems inconspicuous, and even seems a little redundant, but after really tasting it carefully, it is found that they are all full of wisdom.

After carefully reviewing this design, Yang Hui felt that it was difficult to describe the ingenuity in it, and in the end, all the exclamations could only be reduced to one sentence: "Wonderful!" It's just amazing! ”

Then, Chief Engineer Yu and Chief Engineer Song, who were also responsible for the design of the fourth-generation aircraft scheme in their hands, also nodded along with Yang Hui to express their admiration for Chief Engineer Lu's plan.

At this time, Chief Engineer Lu did not make excuses, he has devoted himself to research all these years, in order to create an excellent military fighter? Although the J-12 ended in failure, the current light four plan has finally seen the light of day, and it is enough to be able to get heartfelt praise from colleagues.

Turning his head, he saw that Sun and Wu, the two chief designers of the new generation of fighters, who still didn't understand the way on the side, began to explain the essence of the design.

"You two have not participated in the R&D and exploration project of the fourth-generation aircraft, and you should not be very clear about the design focus, so let me tell you. First of all, one of the most important indicators of the fourth-generation aircraft is: stealth design, and this stealth design is the first aircraft frontal stealth, after research, we found that the radar reflection source on the front of the aircraft, the uncovered engine fan blades are a large radar reflection source, and this is not only our research found, the United States research also acknowledges this. ”

As soon as Chief Lu talked about the radar reflection of the air intake tract and the engine, Yang Hui knew that he was right, and the biggest consideration of Chief Lu's plan was stealth design, and as Mr. Lu continued to explain in depth, Yang Hui and others also listened with interest.

"In order to shield the engine's fan and prevent the fan from being irradiated by radar and reflecting echoes, our DSI inlet is a good solution at first, but it is not enough, in order to better achieve frontal stealth, the S-shaped design of the intake duct is a new solution. The American F-22 fighter adopts this design, their air intake is bent towards the central axis of the fuselage, and the F-22 originally used two engines arranged at a small distance, so this S-type design is the most suitable for them to use, and the S-type design can also leave side bomb bays for them to carry missiles. ”

After introducing this much, Chief Engineer Lu finally wanted to tell the essence of his light four design plan: "Our design is different from the American F-22 fighter, the air intake of the light four is born S-shaped, not only that, but our aerodynamic design also ensures that the aircraft has good maneuverability, so it is definitely not an attack aircraft that can only stealth." ”

At this time, the two chief engineers Sun and Wu discovered that in the light four plan of the chief division Lu, after the air intake is placed in front of the wing, the air inlet needs to have an upward bend at the leading edge of the wing due to the obstruction of the wing, so that the air inlet can pass above the wing.

And this bend is exactly the S type, and then coupled with the partial blocking of the DSI inlet tract, no matter which direction the radar irradiates from the inlet tract, it is impossible to directly irradiate the engine in the end, which cleverly solves the problem of stealth of the engine.

At the same time, Yang Hui can also see through the picture that the light four scheme can bend more for the natural formation of the air intake in front of the wing, even if the aircraft is a lower single-wing design, the wing is slightly raised, so that there is a slight height difference between the wing and the belly, but it is definitely not as obvious as the F-35 and F-22.

After taking a breath of relief, Chief Engineer Lu continued: "After talking about the design of the air intake, let's talk about another major requirement of the stealth fighter: the built-in magazine, now you can take a closer look, there are actually only two bomb bays on the left and right in the plan I brought." The scheme does not arrange separate side bomb bays, or more directly, because the height difference between our wings and the belly is not large, so the side bomb bay and the belly bomb bay are merged together, the side bomb bay is a hatch, plus the belly bomb bay door, the closure of the two hatches is the folded line transition between the belly and the side fuselage. ”

At this time, Yang Hui fixed his eyes and found that the design of this bomb bay is really only two, but due to the opening between the side bomb bay and the belly bomb bay, the size of this bomb bay is definitely not small, even compared to the bomb bay of the special attack aircraft F-35, the bomb bay of the light four will definitely not be small, although there are only two bomb bay designs before and after, but the belly will definitely not be small.

Moreover, as far as Yang Hui sees now, he only needs to fix his eyes to understand that although the side bomb bay and the main bomb bay are merged together, after the side hatch is opened, if the design is reasonable enough, this can be done the same as the F-35, and the infrared fighting bomb is installed on the hatch cover, so that it can be regarded as having a side bomb bay. (To be continued.) )