Chapter 37 J-7E Chief Designer’s Shock [Please read]
Later that day, inside the 611 Research Institute in Chengdu.
Lu Yuying, a 59-year-old aircraft designer, had 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 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. 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 90s 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.
Therefore, relying on enlarging the body and sacrificing mobility in exchange for extremely limited over-the-horizon detection capabilities...
No way!
Therefore, 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, but none of them satisfied him.
In recent months, Lu Yuying has been researching a way to introduce air into the lower jaw, 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.
When I took it out, I saw 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 wasn't going to make an exception this time either.
It's just a pity that I won't be able to advance the work at hand this whole night.
"Ugh……"
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-turning inlet/conical anterior body"
The moment he saw the title, he was even stunned for a moment - he thought he was looking at a report submitted by his own designers.
"interesting……"
Lu Yuying immediately 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 corresponding author are the same person, Chang Haonan..."
Lu Yuying shook his head at a name he had never heard of.
He had at least heard of several relatively high-level professors at Jinghang.
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.
If someone from your own school submits an article, the editorial department will take care of it 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 precursor boundary layer for the internally turned inlet, but also effectively avoids the interaction between the precursor boundary layer and the internal flow field of the inlet in the traditional mandibular inlet layout. interference."
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 summary, the right hand holding the pen trembled suddenly.
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 unbelievable result had even been "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 have passed...
twenty minutes……
One 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.
such as:
"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 dry stuff.
And the idea of finding and solving problems is very clear.
Even though he is a 59-year-old comrade, he has to lament the 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 the review process.
So Lu Yuying didn't know who this Chang Haonan was.
We 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 are traveling abroad, and few choose to come back after going out.
Therefore, if this is really the case, it is a rare thing.
Moreover, after reading the entire text, Lu Yuying realized that the content of the paper should have been declassified, with some data and processes hidden.
Therefore, after going to work tomorrow, he plans to call Beijing Airlines to see if he can 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 paper reviewers are only responsible for examining the research process and ideas, they are not responsible for the authenticity of the data itself.
But as an aircraft designer, he has to ensure that the data he gets is complete and true.
Of course, judging from the rigor of the process discussed in this paper, Lu Yuying is relatively optimistic about the results.
