Li Shuguang stood up very confidently and said: "Dear leaders and seniors, I am very grateful today. Mr. Song invited me to meet with you and serve as the senior consultant of the 611 Institute. To be honest, everyone here is better than me.

I am older and have more experience in aircraft design and development, so I am not qualified to be this consultant."

Indeed, apart from Li Shuguang, the youngest person in this conference room is already thirty years old. After all, you cannot be a supervisory designer without certain qualifications.

As soon as the words changed, Li Shuguang said: "But Mr. Song thinks highly of me so much and gives me this opportunity, then I will boldly put forward some suggestions. If there are any inaccuracies, please correct me."

As he spoke, Li Shuguang picked up two wooden models of the new fighter plan, which are the latest optimization results of the 611 Institute. Among them, the one with an air intake in the abdomen looks very much like an F16 fighter jet, with an elliptical air intake.

The side air intake scheme is relatively similar to that of the J-9. Indeed, it was optimized from the J-9.

Li Shuguang pointed to the abdominal air intake and said: "Our new fighter, first of all, is the power system. It must meet the standards of third-generation aircraft, that is, it must be equipped with a high-thrust afterburning turbofan engine. Yesterday, Mr. Song and I discussed this issue.

The 24th Institute has already contacted Jiang

The director and others have discussed that our aero-engine will soon achieve a breakthrough, so now I can tell you with confidence that the engine afterburner thrust of our new J-fighter will not be less than 13 tons, and the thrust-to-weight ratio will not be lower than 13 tons.

Under seven point five!"

Hearing the news, the designers in the conference room all exclaimed, how is this possible? It can't be a turbofan six engine. There are many problems with that thing, and it is impossible to install it on the new Jian.

Initially, the turbofan six engine was used to power the J-9 fighter. Although the turbofan six engine underwent a 24-hour ground test last year and was ready for installation and test flight, it has never been tested because of many problems.

.

Seeing everyone's reaction, Li Shuguang naturally knew what everyone was thinking, so he continued: "This engine is not a turbofan six, but a brand new turbofan engine. Now our 624th Institute,

We already have the development conditions and confidence to develop not only high-thrust turbofan engines, but also medium-thrust turbofan engines to upgrade the J-7-8 aircraft."

This news stirred up waves, and the designers all started talking in low voices below.

Li Shuguang continued: "With such a good high-thrust turbofan engine, we can freely design our new fighter. The matching of the air intake and the engine is very important. A good air intake can make the engine fully

Give full play to its performance and ensure the safety of fighter aircraft under various flight conditions. Now

Among the air intakes of these two plans, one is an abdominal pitot tube-type air intake, similar to the air intake of the F16 fighter, and the other is an air intake on both sides, similar to the MiG 23. My suggestions

Yes, it uses the most advanced double-beveled wave-riding air intake among the more advanced two-rib air intakes!"

Double beveled waverider air inlet! It can be said that most of the designers present have not heard of this term, because this kind of air inlet has not actually appeared in the world yet, but Li Shuguang has

Not long ago, I discussed this air inlet with Chief Engineer Gu and the others, which will be used by the J-8 II fighter.

Of course, Master Song knew about the existence of such an air inlet from the review experts at the time, but he didn’t know how to design it.

Li Shuguang said sternly: "It's normal that people don't know much about this kind of air intake, because this kind of air intake design was created by me personally, and there is no such design abroad!"

Suddenly, the whole scene was boiling because everyone couldn't believe that Li Shuguang could design a brand new air intake. This was no joke. After all, the design of the air intake was very complicated and could not be designed by imagination.

Everyone can draw it randomly, but can the drawn air intake work properly? This is a problem.

But it doesn’t look like Li Shuguang is talking nonsense.

Faced with everyone's doubts, Li Shuguang continued: "Currently, a large number of wind tunnel tests have been done on this inlet, and the results show that its inlet rate is better than any current supersonic inlet for fighter jets.

It also has a certain stealth effect, and the radar reflection area is small. And it can be well integrated with the fuselage, creating better conditions for the wing-body fusion design."

At this time, a designer from the pneumatic room of the 611 Institute couldn't help but ask: "Gong Li, you said that the air inlet you designed is better. Do you have specific parameters that you can tell me?"
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Li Shuguang smiled and said: "Of course there is no problem. Let's compare this pitot tube inlet with the double beveled waverider inlet. I have a piece of information here that you can take a look at."

This time Li Shuguang also brought comparative technical information on the two air inlets. This was all done at 601. The improved model of the J-8 II fighter was compared with the pitot tube inlet at that time.

Now that the information is in the hands of the designers, everyone looks at it, how is this possible?

The pitot tube air inlet is the simplest supersonic air inlet. This fixed air inlet can be arranged on the nose, belly, or even both sides of the fuselage.

At supersonic speeds, a shock wave will be formed in front of the pitot tube air inlet to decelerate the intake air. This type of air inlet is very simple, has no weight loss, and is relatively insensitive to the direction of the intake air flow. However, because it is not adjustable, the maximum speed

The adaptability range can only reach Mach 1.8.

The parallelogram double beveled waverider inlet designed by Li Shuguang improves the total pressure recovery through the carefully designed internal S-shaped inlet and can adapt to the maximum speed of Mach 2.3.

Therefore, after adopting this new air inlet, the fighter can not only have good subsonic performance but also very good supersonic performance. For example, when intercepting at high altitude and high speed, the advantage of this air inlet is

It’s more obvious.

Of course, another point is that when flying at a high angle of attack, this double-beveled waverider inlet is better than a simple abdominal pitot tube or a pitot tube inlet on both sides.

As for the reduction of the radar reflection area, designers are not concerned about it. After all, the stealth era has not yet arrived. When mobility is king, the pursuit is mobility, and the requirements for the air inlet are mainly in this aspect.<

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After seeing everyone's reactions, Li Shuguang knew that he had to win this time and convince the designers that this design was better.

Li Shuguang continued: "The double-beveled waverider inlet uses the supersonic shock wave supercharging principle to increase the inlet pressure under supersonic flight by separating the supersonic shock wave. With it, coupled with the large
Chapter completed!