Yan Zhongzhong's report quickly attracted the attention of the Commission of Science, Technology and Industry for National Defense.

In the evening of the same day, General Ding Gaoheng, director of the Commission of Science, Technology and Industry, convened experts in the field of aviation who were in Beijing and held a small but high-level internal forum.

Among the invitees naturally included Du Yishan and Liu Zhenxiang, who were in Beijing Airlines.

As academicians, the two of them are naturally equipped with special cars, but Liu Zhenxiang's organizational relationship is still on the side of the 624 Institute, so he had to squeeze in the back seat of the same car with Du Yishan.

"You're pretty well prepared."

Du Yishan glanced at Liu Zhenxiang, who was carrying a bulging briefcase.

The latter casually put the bag between the two and said with a smile:

"Your baby student, this time the whole movement is not small, Fucheng has already called me last night, telling me that I am going to apply for a standard review, but I didn't expect to directly alarm the Science and Technology Commission."

"Oh, this stinky boy, I made such a big deal, and everyone knew about it before me, and in the end, I, the mentor, was kept in the dark."

Du Yishan had a cold face, but the joy in his tone couldn't be hidden at all.

It's like a child who has just gotten a new toy, and although he talks about it, he can't help but take it out and dangle it in front of his friends.

And deliberately pretended to be casual.

There is no doubt that Liu Zhenxiang is the little friend who was dazzled:

"Okay, okay, I know that you have a great student, and when the matter of the 624 Institute is settled, I will also move the organizational relationship back to Jinghang as a professor......

"In fact, when Chang Haonan officially studies for a doctorate next year, you can also come to be his assistant tutor." Du Yishan looked cunning.

"Go, go, that's the same thing......"

Liu Zhenxiang suddenly regretted that he had just rejected the proposal of the Commission of Science and Technology to send a car to pick him up, and chose to ride in the same car with the other party.

But then again, since Chang Haonan has also shown extraordinary ability in the field of aviation power, it seems that it is not impossible to put on a name?

Of course, the associate tutor is nameless and unpleasant, but if you can be a joint training mentor......

That's at least half a student.

Looking at the street scene that swept back quickly outside the window, Liu Zhenxiang couldn't help but start thinking about this possibility.

……

The seminar was held in an inconspicuous conference room of the Commission of Science and Technology.

The number of participants was small, and there were only two rows in total.

Everyone had only a bottle of water in front of them, and no meeting papers.

It wasn't until about ten minutes after the scheduled start time of the meeting that two staff members finally hurriedly walked in and handed a black briefcase to Ding Gaoheng, who was sitting at the head of the conference table.

"Comrades, we also received the report at noon, so today's forum is really in a hurry."

Ding Gaoheng said as he took out two documents from his briefcase and handed them to the first person on his left and right hands:

"These two copies were just brought by the confidential officer from Fucheng, "Guidelines for the Assessment of Imported Total Pressure Distortion of Aviation Turbojet and Turbofan Engines", because I didn't have time to print more copies in a hurry, I bother the experts to circulate them first, and Comrade Liu Zhenxiang will also introduce us to the relevant situation later."

With the status of everyone in the conference room now, it is rare to encounter something that needs to be circulated, but it also shows the importance of this matter from the side.

"Total Pressure Distortion Assessment ......"

"I think it was GJB/Z64-94?"

"That's right, but that standard really doesn't have much operational value......"

“……”

When Ding Gaoheng heard the names of the two documents, the experts below also began to discuss in whispers.

Since it was a short-notice meeting, most people only knew that they were coming to attend a symposium related to the aviation industry, but they didn't know exactly what it was about.

After about twenty minutes, the document was finally brought to the back.

The meeting room fell silent.

Like Yan Zhongzhong before, although the time is not enough for everyone to read the content, for these people in the industry, as long as they glance twice, they can probably judge the value of this thing.

"Ahem......"

Liu Zhenxiang coughed lightly twice:

"This guide was compiled by the 606 Institute in the process of testing the improved turbojet 14 engine at an altitude platform, and they are now following the steps to conduct the intake distortion test."

"We know that the year before last, we issued our own national standards on the basis of the introduction of American standards, but in terms of specific engineering applications, the 1994 standards still have some deficiencies."

"For example, we don't know what kind of impact different forms of distortion spoilers can have on the stability of the compressor, how much steady-state and dynamic distortion intensity can be generated by the same distortion spoiler, and whether the integration time scale has an impact on the stability margin......"

"The guide that the 603 Institute came up with based on the test experience of the turbojet 14 engine this time is to supplement and correct the ambiguity in the 1994 standard and the incompatibility with China's aviation industry system at the operational and theoretical levels."

“……”

Hearing this, even Ding Gaoheng, who was the first to sit, showed a somewhat helpless smile.

The formulation of the national military standard requires the approval of the Commission of Science, Technology and Industry for National Defense.

In the early 90s, in the face of an almost blank standard system in China, the biggest problem faced by the Commission of Science and Technology was not even that it did not know how to establish standards, but that it did not know what standards needed to be established.

Therefore, the principle at that time was to ignore the specific content first, occupy the pit position by taking it, and establish a standard system.

By analogy, it is probably to build a library from scratch, because I have no experience, so I have to follow the example of other libraries, first determine the classification of books and the required bibliography, and then slowly fill in the specific books later.

In this case, Liu Zhenxiang's evaluation of GJB/Z64-94 "still has some deficiencies" is indeed enough to save face for the Commission of Science and Technology.

After all, it's actually a shell, the equivalent of a fake book on a shelf......

"I think that this guide has a strong operability, and we can consider sending an expert group to the 624 Institute to confirm the ground test results of Turbojet 14, and modify the operation and evaluation specifications in GJB/Z64-94 based on the content of the guide and the existing engineering experience, so as to better carry out the research on distortion experimental evaluation technology."

This kind of internal small-scale symposium was relatively casual, and Liu Zhenxiang's position in the field of aviation power was very detached, so he did not make any twists and turns, but directly expressed his attitude after the introduction was completed.

"I don't think the people who wrote this guide were thinking about changing the old standards."

As soon as Liu Zhenxiang's words fell, another expert sitting at the end of the conference table opened his mouth to express a different opinion.

He flicked the document in his hand lightly:

"Because I'm the last one here, I took advantage of it and took more time to watch it than my comrades."

"The 1994 standard is formulated by drawing on the ARP and AIR series of general specifications, and has a strong British and American style in the evaluation method, such as using a distortion net to simulate a typical distortion flow field, studying the effect of distortion on stability through the description of the maximum instantaneous distortion, and establishing the relationship between compressor surge or stall and the maximum dynamic distortion."

"On the one hand, this set of methods is costly and very cumbersome, and on the other hand, it does not cooperate well with China's existing aero engine design system."

"But the guide we just saw is completely different, it uses the turbulence degree in the comprehensive distortion index of the engine import to evaluate the pressure distortion, and the test method is also used in 86 years, Academician Liu has proposed the plug-in board simulation method, but it should be the optimization and discussion of the plate type."

"What's more, in the last part of this guide, there is also a mention of the comprehensive evaluation method of aerodynamic stability in the engineering design stage, which I briefly looked at, and it is definitely something that can only be written by people with experience in engine design, and it is very instructive."

"So this is by no means a tinkering with the 1994 standard, we should treat it as our own and brand new standard!"

(End of chapter)