Chapter 1206: Pneumatic vector nozzle, a bright future?
Although he had expected the result, at this moment, Sun Cong still couldn't help but feel a little regretful.
The first thing that 601 Institute was optimistic about was indeed a three-wing plan, which focused on achieving stronger maneuverability with a relatively weak power level.
But due to well-known reasons, about a few years ago, there were some minor changes in the premise of "weaker power level", so they also took advantage of the situation and shifted their focus to regular layout and semi-tailless layout. .
This time we also brought two sets of plans at the same time, and we are ready to decide which one to use based on the on-site conditions.
Therefore, when Chang Haonan took out the indicators of the turbofan 10G, they already had the idea of competing with a semi-tailless layout.
Coupled with the targeted speeches from the 611 Institute later, the delegation finally reached a consensus.
After all, they also considered that it took less than five years for Academician Chang to come up with a quasi-fourth-generation turbofan 10, and now it will take less than five years to come up with thrust vector technology. , seems reasonable.
But success also means failure.
The last glimmer of hope for this plan was extinguished with Chang Haonan's statement.
Correspondingly, Yang Wei, who was sitting opposite him, breathed a long sigh of relief and couldn't help showing a relaxed expression.
In fact, until not long ago, even within the 611 Research Institute, there were still some different voices on whether to continue the J-10's airfoil configuration in the design of the fourth-generation fighter jet.
Especially considering the rapid progress of the domestic aviation industry, it seems that it is not impossible to come up with a model that can compete with the F119 in about 10 years.
In this case, directly replicating an F22 is obviously the least risky option.
As for the intermediate transition period, the turbofan 10B, which has already passed the test on the J-10, can be used as a substitute.
However, on the one hand, 601 has insufficient accumulation in conventional layout, and it is difficult for a satisfactory plan to stand out within the group.
On the other hand, Yang Wei himself does not want to simply follow the Americans.
What he just said as an opening statement was actually not only addressed to others, but also to himself.
Fortunately, the final result is still in line with expectations...
……
After all, the Aviation Industry Group is a whole. Although the subordinate units may have differences in technical routes, in general, once the direction is determined, they can still work together.
For example, the 611 Research Institute had no experience in designing twin-engine heavy-duty aircraft in the past, so although it gained the initiative in design and layout, it still needed the help of other brother units in terms of structure.
So, the rest of the entire meeting basically consisted of communicating with representatives from the Air Force Equipment Research Institute such as Lu Guang, and continuing to deepen some details based on the canard + delta wing solution.
In fact, although Chang Haonan has been an executive in the Aviation Power Group for several years, he still started his career in aircraft design.
So even in the second half of the meeting, there were still people asking him questions from time to time.
But in the face of these questions, Chang Haonan basically just gave the most basic answers and did not expand too much as he just did -
It was not to avoid suspicion in business, but he was still thinking about 601 The proposed semi-tailless solution.
After all, from the perspective of equipment habits, for the sake of risk sharing and business balance, the air forces of major countries generally do not only equip a single type of main fighter aircraft.
Technically speaking, the canard + delta wing layout is not particularly suitable for carriers due to the flight characteristics during takeoff and landing.
This can be verified from the technical data of Rafale M on hand.
More importantly, the semi-tailless layout just fits an important new technology that Chang Haonan is planning to develop in the next stage...
Therefore, during the lunch break of the meeting, Chang Haonan took the initiative to find him. Sun Cong was still a little depressed.
Although the two have not worked together directly, Chang Haonan has worked in the 601 Institute for a long time, and he also received the "Operation Bat Hunting" commemorative medal with the latter, so he can be regarded as an old acquaintance.
Due to limited time, after a brief exchange of greetings, Chang Haonan went directly to the topic:
"Mr. Sun, at the meeting just now, I just discussed the matter. In fact, I personally have We are quite interested in the semi-tailless layout of Institute 601..."
Of course Sun Cong knew that the other party was not targeting him. But humans, it is inevitable to have emotions at times like this.
Of course, since Chang Haonan is now an academician, he cannot really show any dissatisfaction.
But I still don’t want to mention this sad thing.
So I immediately prepared to change the topic:
"I understand, Academician Chang... it's all in the past, there's no need to mention it anymore..."
As a result, he was interrupted by Chang Haonan in the middle of his sentence:
"I'm not being polite, I'm really interested in this plan."
He said and pointed to the PPT that was still open on the computer screen next to him.
Sun Cong was silent for a moment, then sighed heavily, and still couldn't help but spoke:
"Academician Chang, with vector propulsion technology, if you really take the lead, won't you really be able to overcome the lifespan problem?"
Obviously, he still felt unwilling in his heart.
Chang Haonan did not answer the question directly, but showed a smile and whispered:
"Actually, I came to you this time just to talk about this matter in detail. ..."
Hearing these words, a moment of astonishment flashed across Sun Cong's face.
Then he showed hopeful eyes again.
“What we are currently testing on the ground includes, of course, several vector nozzles that have been put into use by the United States and Russia, whether they are deflector type, convergence regulator type, binary pitch type, or even rocket nozzles. The swing type used on the engine is a mechanical thrust vector nozzle. ”
“The direction of thrust action is adjusted through the mechanical structure. Although it is simple in principle, the control mechanism is complex, cooling and sealing is difficult, and the additional cost is heavy... ...And adding hundreds of small moving parts out of thin air, no matter how advanced the technology is, reliability and lifespan will definitely be affected. This is determined by engineering principles..."
Chang Haonan said here, slightly There was a pause.
Sun Cong also nodded to express his understanding.
"So I have been thinking about developing an aerodynamic vector nozzle with a fixed geometry, so as to avoid the performance loss caused by the complex mechanical structure."
At this time, Sun Congke was a little confused. ...
“A vector nozzle with a fixed geometric shape?”
He frowned, and for a moment he even doubted whether he heard correctly.
The core function of the vector nozzle is to change the thrust direction.
But it needs to be geometrically fixed...
It has a sense of déjà vu like "zoom in and zoom out a little bit" or "colorful black".
Chang Haonan also knew that his statement was a bit strange, so he quickly explained:
“You should know that the ejection nozzle used on the old turbofan 10 is passed through the nozzle. The secondary flow is injected into the throat position to adjust the throat area of the nozzle, right?”
The old turbofan 10 he mentioned refers to the version that had been abandoned before he took over.
Sun Cong nodded subconsciously at first, and then showed a clear expression of "I see":
"What you mean is that the secondary flow is injected in an asymmetric way inside the nozzle, so that the secondary flow passes through the nozzle. effect to control the direction of thrust?”
“Yes, that’s why it’s called an aerodynamic vector nozzle”
Chang Haonan looked at the layout renderings of the semi-tailless layout again:
“However, this technical route requires a very sophisticated engine electronic control system and a much larger engine bleed air volume, so a newly designed aviation platform is required to fully exert its performance advantages...”
"I don't know... Mr. Sun, what are your intentions?"
(End of this chapter)