Chapter 1204 Blueprint for the Next Generation Fighter
As Chang Haonan finished speaking, the PPT was turned to the second page.
The above is a schematic diagram of the aircraft engine structure, and a fairly simple table -
"Fourth Generation Fighter Baseline Engine 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
Turbine front temperature: ~1850K
Afterburner thrust: 150-155kN
Intermediate thrust: 95-100kN
......
The turbofan 10 left enough room for upgrades to the fourth-generation power. This is something that many people know.
But almost no one thought that it could reach this point.
The data in front of me is almost on par with the F119PW100 engine used on the F22.
Although there is a certain gap in aspects such as afterburner fuel consumption, it is more due to different performance trade-offs rather than an absolute backwardness in technology...
If the PPT page just now is okay, Think of it as the cake that Chang Haonan drew for everyone.
This form, even if it is not enough to make the cake, can at least see the dough, the dough board and the rolling pin.
For a time, the entire venue, including Song Jiaxiang, felt that happiness came so suddenly that they were caught off guard...
"Academician Chang, this...should still be the turbofan 10 modification...right?"
Song Jiaxiang asked with a somewhat uncertain tone:
"I mean, In terms of the research and development timetable..."
Chang Haonan naturally understood what he meant, and immediately nodded and replied:
"Generally speaking, the third-generation fighter engine is limited by its basic structure. , it is impossible to meet all the power plant requirements of the fourth-generation fighter through simple improvements, so it is necessary to develop a new fourth-generation power.”
“But because of the special circumstances of the Turbofan 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 research and development stage, we call this powertrain the Turbofan 10G. It can still confuse outsiders to some extent... As for what to call it after it is finalized, we can wait to discuss it later.”
But it is obvious that everyone’s focus is not on the details such as the name.
You must know that all units have basically planned and designed plans based on the performance of the turbofan 10B.
And now...
Chang Haonan noticed with sharp eyes that there had been a commotion over at Institute 601, and it seemed that a new plan was being replaced on the spot——
Originally, the fourth-generation pre-research was meant to open up the imagination, so it was impossible for each research institute to have only one set of preparations.
Since the expected power level has changed significantly, the priorities of various internal plans will naturally also change.
He glanced at it from a narrow angle and found that what appeared on the opponent's computer screen was a plan that seemed somewhat similar to F22, although the details were different.
However, while they were in a hurry, the 611 Institute sitting next to them successfully took the lead.
“Comrades, let me first give you some ideas.”
The first person to speak was Yang Wei, who has now taken over the position of chief engineer of the 611 Institute:
“The basis of modern aviation stealth technology is still based on aircraft shape stealth as the core, whether it is absorbing materials, or plasma stealth, etc. Regardless of technology, it will still be difficult to dominate for at least the next 15-20 years. Therefore, the measures to achieve stealth are relatively unified. The main difference lies in the aerodynamic design method and wing composition adopted by the aircraft under the stealth requirements standard. "
The words he used were very modest. But judging from the momentum, it was directly aimed at setting the tone for the meeting.
While talking about this opening statement, 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 don’t just imitate.”
"Just now, Academician Chang gave our fourth-generation fighter a target engine with performance no less than that of the F119PW100 engine, which provided a solid foundation for our aircraft design work... But even so, if we just follow the technical ideas of the F22 , and it is impossible to truly obtain a product that surpasses its performance..."
Even Chang Haonan, who did not know the inside story, could hear that this sentence was very targeted.
Sure enough, the busy 601 Institute suddenly stopped for a moment. After all, everyone is a second-level unit under the same system.
Everyone knows some details about the other party.
Yang Wei, as if he saw nothing, continued:
"From the perspective of external experience, the United States had a duck layout plan in the early stages of the ATF and JSF project selection process, although later They all lost to the conventional layout in the competition, but more because the United States was unable to completely solve the interference of the front wing on the main wing while meeting the stealth requirements. "
"But through the training of Project 10. , and the flight data accumulated from nearly a hundred J-10 aircraft at various stages, we have undoubtedly surpassed the United States in the performance characteristics and design methods of the canard-delta wing aerodynamic layout, which is enough to support the fourth-generation fighter Apply this design plan..."
Speaking of this, he called up a slightly rough diagram on the PPT, but he could already see some of the features of the J-20:
" The number of airfoils of the canard plan is the same as that of the conventional layout. As long as it is designed properly, it will not have a negative impact on the forward radar reflection area that aviation comrades are most concerned about. The inlet part can also use the DSI structure that we are familiar with to further improve stealth. capabilities, but compared to the J-10, the air inlet of the fourth-generation fighter needs to be optimized towards the supersonic range. Fortunately, the target power performance is strong enough to support sufficient subsonic performance..."
"The air intakes on both sides of the fuselage facilitate the installation of a bomb bay of sufficient size in the middle of the air intake. 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 air intakes The flow path between the inlet and the engine fan is to avoid the bomb bay, which will naturally form an S-shaped inlet on the axis of the intake duct that is conducive to low RCS requirements and better balance 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 make up for the loss of stability compared with the conventional layout, it may be necessary to add additional directional stabilizing surfaces. These will indeed give The aircraft's lateral stealth capability has brought some adverse effects, but our future combat model is inherently different from that of the US military, including Comrade Lu Guang's speech just now, which also placed supersonic maneuverability in front of lateral RCS..."
"..."
For this plan of the 611 Institute, Chang Haonan, who has seen the J-20 with his own eyes, may be more familiar with it than Yang Wei himself today.
But after listening to the whole process, I still gained a lot of new things.
Especially in terms of performance trade-offs, it has indeed reached a certain level of perfection.
In fact, Chang Haonan has no strong will to make changes in the route selection of the fourth-generation fighter jets, and is completely prepared to let nature take its course.
He believes that based on the current level of China's aviation industry on this timeline, no matter which solution is chosen in the end, it will be able to produce a product with performance no less than that of the F22.
However, Chang Haonan was still a little curious about how his opponent planned to counterattack.
He did know that in addition to the famous three-wing design, 601 had a traditional layout plan similar to the later enlarged version of the J-35A.
Combined with what I saw at a casual glance just now...
Maybe it's that one?
But if this is the case, it seems a bit too boring.
Besides, what Yang Wei just said is right.
Under the current technical conditions, the F22 has basically reached the peak of the fourth-generation fighter with conventional layout. If we blindly follow the development pace of American aviation technology, the result will only be further and further away.
For a time, almost all the attention in the venue was focused on the people in School 601 opposite.
And their response was also quite rapid.
Soon, a new schematic diagram appeared on the curtain at one end of the conference room.
It is the plan that Chang Haonan saw before.
At first glance, it does look like an F22 using a DSI air intake.
In other words, the F35 in a double-release layout.
But now taking a closer look, Chang Haonan immediately noticed a new detail -
This aircraft has neither canards nor a tail in the conventional sense!
(End of this chapter)