The military-industrial scientific research system of the academic master.

As Chang Haonan finished speaking, the PPT turned to the second page.

Above is a schematic diagram of the aircraft engine structure and a fairly simple table -

《Fourth Generation Fighter Engine Benchmark Performance Indicators》

Thrust to weight ratio: ~10

Bypass ratio: 0.3-0.4

Fan pressure ratio: 3.8-4.5

High pressure compressor single stage pressure ratio; 1.08-1.46

Total boost ratio: ~25

Temperature before turbine: ~1850K

Afterburner thrust: 150-155kN

Intermediate thrust: 95-100kN

……

It is something that many people know that the WS-10 left enough room for upgrading to the fourth-generation power.

But almost no one expected it to be this far.

The data in front of us is almost on par with the F22PW119 engine used on the F100.

Although there is a certain gap in aspects such as fuel consumption, it is more due to different performance choices rather than absolute backwardness in technology...

If the previous page of PPT can be regarded as the pie that Chang Haonan drew for everyone.

Even if this form cannot be used to make pancakes, at least it can show the dough, the rolling board and the rolling pin.

For a moment, the entire venue, including Song Jiaxiang, felt as if happiness had come too suddenly and caught them off guard...

"Academician Chang, this... should still be the WS-10 modified version... right?"

Song Jiaxiang asked with a somewhat uncertain tone:

"I mean, in terms of the development schedule..."

Chang Haonan naturally understood what he meant, and immediately nodded and replied:

"Generally speaking, third-generation fighter engines are limited by their basic structure and cannot meet all the requirements of fourth-generation fighter engines for power units through simple improvements, so a completely new fourth-generation power needs to be developed."

"But because of the special situation of WS-10, we don't need to go through the development process again, but can make modifications based on it... I personally suggest that, at least in the development stage, we call this engine WS-10G, which can confuse outsiders to some extent... As for what to call it after it is finalized, we can discuss it later."

But it is obvious that no one's focus is on details like the name.

You know, before this, all units basically planned and designed the plan according to the performance of WS-10B.

And now...

Chang Haonan noticed that there was a commotion at the 601 Institute, and it seemed that they were changing a new plan on the spot.

The fourth-generation pre-research is originally quite imaginative, so it is impossible for each research institute to have only one set of preparations.

Since the expected power level has changed significantly, the priorities of internal plans will naturally change.

He took a quick glance at it from a narrow angle and discovered that what appeared on the other party's computer screen was a plan that seemed somewhat similar to the F22, although with some differences in details.

However, while they were in a panic, the 611 Institute sitting next to them successfully seized the initiative.

"Comrades, let me start by saying something."

The first person to speak was Yang Wei, who has now taken over the position of chief engineer of the 611 Institute:

"The foundation of modern aviation stealth technology is still based on the stealth of aircraft shape. Whether it is radar-absorbing materials or plasma stealth technology, it is difficult for them to occupy a dominant position at least in the next 15-20 years. Therefore, the measures to achieve stealth are relatively unified. The main difference lies in what kind of aerodynamic design method and wing surface composition the aircraft adopts under the stealth requirement standard."

The words he used were very humble, but judging from his tone, he was intended to set the tone for the meeting.

While he was speaking, the conference staff had already switched the projector line to the computer in front of Yang Wei:

"In this regard, our principle is not to be innovative, but also not to imitate blindly."

"Just now, Academician Chang gave us a target power for the fourth-generation fighter jet that is no less powerful than the F119PW100 engine, which provides a solid foundation for our aircraft design work... But even so, if we just follow the technical ideas of the F22, it is impossible to truly obtain a product that exceeds its performance..."

Even Chang Haonan, who didn't know the inside story, could tell that this sentence was very targeted.

Sure enough, the busy 601 Institute suddenly stopped for a moment.

After all, we are all second-level units under the same system.

Everyone knows a little about the other party.

Yang Wei seemed to have seen nothing and continued:

"From the perspective of external experience, the United States had canard layout solutions in the early stages of the ATF and JSF project selection process. Although they were later defeated by conventional layouts in the competition, it was more because the United States could not completely solve the interference of the front wing on the main wing while meeting the stealth requirements."

"But through the training of Project No. 10 and the flight data accumulated from nearly J- aircraft at various stages, we have undoubtedly surpassed the United States in the performance characteristics and design methods of the canard-enlarged delta-wing aerodynamic layout, which is sufficient to support the application of this design scheme on the fourth-generation fighter..."

At this point, he pulled up a rough schematic diagram on the PPT, which already showed some of the characteristics of the J-20:

"The number of wing surfaces in the canard scheme is the same as the conventional layout. As long as the design is appropriate, it will not have a negative impact on the forward radar reflection area that the aviation comrades are most concerned about. The air intake part can also adopt the DSI structure that we are more familiar with to further improve the stealth capability. However, compared with the J-10, the air intake of the fourth-generation fighter needs to be optimized for the supersonic range. Fortunately, the target power performance is strong enough to support sufficient subsonic performance..."

"The air inlets on both sides of the fuselage make it easy to set up a bomb bay of sufficient size in the middle of the air inlet. Although it will increase the cross-sectional area of ​​the middle fuselage by about one-third and the structural weight by about one-fifth, the flow path between the air inlet entrance and the engine fan will naturally form an S-shaped air inlet on the axis of the air inlet duct to avoid the bomb bay, which is conducive to low RCS requirements and better balances the relationship between stealth and flight performance..."

"Of course, the canard layout will inevitably lead to an increase in the axial size of the aircraft. At the same time, in order to compensate for the loss of stability compared to the conventional layout, it may be necessary to add additional heading stabilization surfaces. These will indeed have some adverse effects on the aircraft's lateral stealth capability, but the combat mode we envision in the future is different from that of the US military. Including Comrade Lu Guang's speech just now, supersonic maneuverability was placed before lateral RCS..."

"..."

Chang Haonan, who has seen the J-611 with his own eyes, may be more familiar with this plan of the 20 Institute than Yang Wei himself is today.

But after listening to the whole thing, I still gained a lot of new insights.

Especially in terms of the trade-offs among various performance aspects, it has indeed reached the extreme to a certain extent.

In fact, Chang Haonan did not have a strong desire to make changes in the choice of route for the fourth-generation fighter jets, and was completely prepared to let nature take its course.

He believes that with the current level of China's aviation industry on this timeline, no matter which option is finally chosen, it can produce a product with performance no less than the F22.

However, Chang Haonan was still somewhat curious about how his opponent was going to counterattack.

He did know that in addition to the famous three-wing design, the 601 had long had a traditional layout similar to an enlarged version of the later J-35A.

Combined with what I just saw in that casual glance...

Maybe that's it?

But if that's the case, it seems a bit too boring.

Besides, what Yang Wei just said is correct.

Under the existing technical conditions, the F22 has basically reached the pinnacle of conventional fourth-generation fighter jets. If it blindly follows the development of American aviation technology, the result can only be getting further and further away.

For a moment, the attention of the entire conference hall was almost focused on the people from Institute 601 opposite.

And their response was also quite quick.

Soon, a new schematic diagram appeared on the screen at one end of the conference room.

This was exactly the plan that Chang Haonan had seen before.

At first glance, it does look like an F22 using a DSI air intake.

In other words, the F35 with a twin-engine layout.

But now, after taking a closer look, Chang Haonan immediately noticed a new detail -

This plane has neither canards nor a tail in the conventional sense!