Chapter 37 The shock of the J-7E chief designer [seeking further reading]
Later that day, inside the 611 Research Institute in Chengdu.
59-year-old aircraft designer Lu Yuying has just returned to his office after dinner.
As the chief designer of the J-7E aircraft, he can now be considered successful.
This deeply improved version of the J-7 is well received by the troops and may soon be exported to other countries in exchange for valuable foreign exchange.
Lu Yuying himself is quite satisfied with this model.
But satisfaction does not mean satisfaction. With the completion of the finalization of the J-7E, he has already begun to think about how to improve the J-7 in the next step.
As a member of Institute 611, he certainly knows that Project No. 10 is currently progressing smoothly.
But whether it is from the perspective of project risk prevention or simply from the perspective of export, the J-7 still has the potential to continue to improve.
However, Lu Yuying encountered difficulties when it came to improving his ideas.
There is no doubt that it is already the second half of the 1990s and there is no way out for continuing to build day fighters.
However, the all-weather model J-7C/D that was developed simultaneously with the J-7E was not successful, and the evaluation of the troops was even worse than the former.
So the path of enlarging the body and sacrificing mobility in exchange for extremely limited over-the-horizon detection capabilities...
It doesn't work!
So Lu Yuying quickly began to consider new design ideas.
The space in the nose of the aircraft is freed up to install the radar, and the air intake is placed elsewhere.
But after trying several solutions, either the performance failed to meet the standard, or the changes were too large, and none of them satisfied him.
In recent months, Lu Yuying has been studying a way to air intake the mandible, but the design of this seemingly simple structure is quite difficult.
The radome on the nose part will interfere with the oncoming flow and affect the normal operation of the air intake.
Most design drafts never even make it to completion.
The only relatively successful one, after blowing through several wind tunnels, it was found that the intake distortion at certain speeds and angles of attack can even exceed 0.3, which will undoubtedly make the WP13F engine's already less than adequate performance To add insult to injury.
Now I come back to work overtime after dinner, just for this matter.
Just when Lu Yuying took out the key and was about to open the door, he noticed an envelope stuffed in the mailbox on the wall at the door.
Take it out and see that there are several large characters printed on the kraft paper:
Editorial Team of "Journal of Aeronautics and Astronautics".
As one of the reviewers of this magazine, he naturally has some review tasks to complete every year.
Lu Yuying does not object to reviewing manuscripts and never procrastinates. Whenever she receives a manuscript, she will try to read it as soon as possible.
He is not going to make an exception this time.
It's just a pity that I won't be able to advance the work at hand this whole night.
“Alas...”
Lu Yuying sighed and walked into the office with the envelope.
After pouring himself a glass of water, he returned to his desk.
Light the desk lamp and slowly open the envelope.
"Research on the Integrated Layout of Dual-Module Mandibular Inward-Turn Inlet/Conical Anterior Body"
The moment he saw the title, he was even stunned for a moment - he thought he was reading A report submitted by his own designers.
"It's interesting..."
Lu Yuying suddenly cheered up.
After all, this is exactly what I am currently studying.
He subconsciously turned to the last page to confirm and found that the author was from Beijing Hang University.
"The first author and the corresponding author are the same person, Chang Haonan..."
Lu Yuying shook his head at a name he had never heard of.
He has at least heard of several relatively high-level professors at Beijing Airlines.
It seems that there is a high probability that this is an ordinary or even a bit watery paper.
After all, one of the organizers of Journal of Aeronautics and Astronautics is Beijing Airlines.
When people from your own school submit articles, the editorial department will take care of them to some extent. However, his duty as a reviewer still made him put aside his inner contempt and continue reading seriously.
What if it can bring some inspiration...
However, when he read the summary on the first page, he realized that he had been preconceived.
“This design not only provides a good displacement effect of the anterior body boundary layer for the internally turned inlet, but also effectively avoids the separation between the anterior body boundary layer and the inside of the inlet in the traditional mandibular air inlet layout. The mutual interference between flow fields.”
This sentence almost directly wrote into Lu Yuying’s heart.
He has been tortured by the interference between the precursor boundary layer and the flow field inside the inlet for half a year.
The author of this article claims that he has solved the problem.
“When M=0.8, the total pressure recovery coefficient is not less than...0.942.”
When Lu Yuying saw the last value in the abstract, the right hand holding the pen trembled violently For a moment.
A drop of ink was thrown onto the glass of the table, but he didn't notice it at all.
Compared with his previous designs, it is more than 10% higher.
What Lu Yuying didn't know was that this result that he couldn't believe was even after being specially "handled" by Chang Haonan and Du Yishan.
But this number is enough for him to look forward to the following content.
Wow——
He turned the paper to the second page.
After a ridiculously short introduction, the author started to introduce design ideas and methods without any nonsense.
……
Ten minutes passed……
Twenty minutes……
An hour……
When Lu Yuying read the last page of the paper and raised his head again, the hour and minute hands of the clock on the wall had overlapped.
He actually read the paper for almost six hours without knowing it!
The notebook on the right is already filled with densely written content, some of which are things that I don’t quite understand yet, some of which require calculation or wind tunnel verification, and some of which are simply sighs.
For example:
"It not only ensures the capture of the high-energy mainstream, but also discharges the low-energy flow near the wall out of the inlet, wonderful!" and so on.
This paper is a full ten pages long, but the sentences are concise, concise and concise, and there is no trace of word count.
It’s all good stuff.
And the problem-finding and problem-solving ideas are very clear.
Rao is a 59-year-old comrade, and he has to sigh for his rigor!
It seems that although the author is unknown, he seems to have some engineering experience.
Lu Yuying thought so.
When the paper is officially published in a journal, the author's photo and introduction will be attached at the end. However, this is the job of the editorial department, and the reviewers cannot see it during review.
So Lu Yuying doesn’t know who this Chang Haonan is.
I can only make a rough guess, maybe it is a young talent that Beijing Airlines recently poached from a foreign university.
These days, many Chinese people run away, and few choose to come back after going out.
So if this is really the case, it is a rare thing.
Moreover, after reading the entire text, Lu Yuying has realized that the content of the paper should have undergone a similar declassification process, with some data and processes hidden.
So after going to work tomorrow, he planned to call Beijing Airlines to see if he could communicate with the author himself.
Only after obtaining complete information from the other party can the next step of wind tunnel testing be started.
Because the paper reviewers are only responsible for examining the research process and ideas, they do not need to be responsible for the authenticity of the data itself.
But as an aircraft designer, he had to ensure that the data he obtained was complete and true.
Of course, judging from the rigor of the process discussed in this paper, Lu Yuying is relatively optimistic about the results.
(End of this chapter)