The result of this acceptance is the optimized design plan for the inlet of the J-8 II fighter jet. You must know that Li Shuguang participated in the design optimization. Compared with the original plan, the difference is still very big.

Because this time Chief Engineer Gu adopted the rib air intake design on both sides proposed by Li Shuguang, which means that the air inlets on both sides were changed from being parallel to the longitudinal axis of the fuselage to a design that is retracted ten degrees inward.

It becomes rib air intake.

The benefits of this design are of course obvious, because the performance at large angles of attack has been greatly improved, which is equivalent to combining the advantages of abdominal air intake and air intake on both sides.

You must know that many later fighter jets have this design. For example, the French Rafale fighter, the American F22 fighter and F35 fighter, the F18EF fighter, the Chinese J-20 fighter, and the J-35 fighter all adopt inward retraction.

Two-rib air intake design.

The compact under-rib air intake method has a small cross-sectional area, which is conducive to supersonic drag reduction, and the air intake can be better integrated with the fuselage, which is better than the simple two-side air intake of the original J-8 II fighter

It's much better. You must know that the air intakes on both sides of the J-8 II fighter are like two square holes coming directly from the fuselage. It is not only unsightly, but also has a greater impact on the aerodynamic shape and air intake efficiency.
p>

This is because the original air inlet had a large corner after the airflow flowed in from the air inlet, but now the new design is a longer S-shaped one, so the airflow can flow better in the air inlet.

Flow compression.

This has been verified using the simulation design of Dassault Systèmes, and the air intake efficiency is much higher than before.

Now is the critical moment for acceptance. After all participants arrive, the meeting officially begins.

The person presiding over the meeting was an expert from the Ministry of Aviation Industry named Gao Ming.

Gao Ming said with a smile: "Comrades, experts from Dassault, I think today's acceptance meeting is not only an important victory, but also an important stage in the cooperation between my country and France in the aviation industry. We must vigorously promote the computer Assist in design and manufacturing to truly realize the dream of aviation serving the country."

There was a burst of warm applause. After the leaders finished their speeches, Li Shuguang came on the stage. He had to give a perfect report on the results of this air inlet design to the leaders, and he also had to accept the opinions of the leadership experts.

Inquiries will be considered successful only if the final acceptance is passed.

Facing so many leaders and experts, Li Shuguang still seemed calm and confident, because the system now gave him enough confidence. After obtaining the fly-by-wire flight control system technology, Li Shuguang finally seemed to have entered a vast world. The fly-by-wire flight control system

Technology involves many sciences, including aircraft aerodynamics, air intake and engine control, etc.

The most advanced fly-by-wire flight control system can realize the integration of flight, fire and thrust, which means that the control of the engine and the air intake are all in the flight control system.

The control of the air inlet is part of the propulsion control system, so it is naturally a very critical aspect in the flight control system technology.

Li Shuguang now has a deeper understanding of various air inlet technologies, so it is very useful to report to the leading experts on the optimized design of the J-8 II air inlet plan, including the application of computer-aided design.

Confidence.

Li Shuguang turned on the projection, and the new rib air inlet design of the J-8 II was displayed in front of the leading experts.

This air intake indeed looks more beautiful than the original. It looks a bit like a third-generation aircraft and is very integrated with the fuselage.

Li Shuguang introduced calmly: "Dear leaders and experts, this is the rib air inlet model on both sides of the J-8 II fighter jet that we built with Dassault Systemes. The air inlet is retracted ten degrees inward, combined with the abdominal air intake and the two sides.

The advantages of the side inlet are that the performance is improved when flying at a high angle of attack. The inlet control system includes the air pressure source and air pressure control system, the inlet sloping plate aerodynamic load control system, and calculation

Machine measurement and control system. According to changes in the boost ratio of the engine compressor, the inlet sloping plate angle can be automatically and continuously adjusted to change the inlet inlet area, and compensation adjustment can be made according to the water tail deflection angle to ensure that the inlet and engine work

Matching, so that the engine and the intake duct work stably in the best condition. The sloping plate adjustment starts from the flight Mach number greater than 1.3, and the maximum angle is 15 degrees!"

Li Shuguang's introduction won rounds of applause. It is true that this inlet is well optimized. The most direct point is that it can maximize the engine thrust, and the efficiency is more than 10% higher than the original design plan.<

/p>

And for the first time in the application of computer-aided design, leading experts are naturally very interested in this new technology. After listening to Li Shuguang's report, they learned a lot.

Of course, when the talk was about to end, Li Shuguang mentioned the fly-by-wire flight control system and some ideas of integrating the air intake control and engine control into the fly-by-wire flight control system. Unexpectedly, this caused the leadership to

After receiving warm applause from the experts, a leader impatiently asked.

The leader said eagerly: "Comrade Li Shuguang, how much do you know about fly-by-wire flight control system technology? What you just said is so true. Can our J-8 II be equipped with fly-by-wire flight control?"

Li Shuguang smiled slightly and said: "Of course our J-8 II can be equipped with a fly-by-wire flight control system, but the cost of the fly-by-wire flight control system is very high. If we equip the J-8 II with a digital fly-by-wire flight control system with three axes and four redundancies

system, the cost would be tens of millions. But at this stage

, it is still possible to install a single-axis dual-redundancy analog fly-by-wire flight control system. This will not only greatly improve its flight quality and performance, but also the cost increase will not be very high! It is also technically easy to implement!

I feel confident."

Seeing that Li Shuguang was so confident and said that he could handle the fly-by-wire flight control system, the leaders and experts present became uneasy. After all, Li Shuguang was only a young man in his twenties and had only been working for two years, yet he dared to say such big words.

Either you are confident or you are arrogant.

So one of the leaders was a little suspicious and said in a reproachful tone: "Comrade, don't say this nonsense. The fly-by-wire flight control system is not something you, a young man, can handle just by saying you can handle it. Our aviation industry and

There are so many experts in the Air Force, but they haven’t done it yet, so you just say it’s okay?”

Li Shuguang was not angry or depressed. After all, it was normal for the leaders to question him. He was too young and not a flight controller, so he was indeed a bit crazy to say this.

But Li Shuguang couldn't let go of this opportunity. Faced with the leader's reproach, Li Shuguang still said without being humble or arrogant: "I believe that I can work with the comrades who are engaged in flight control to develop the fly-by-wire flight control and make our J-8 II become a
Chapter completed!