Chapter 112 Our own standards!
Yan Zhongcheng’s report quickly attracted the attention of the Commission of Science, Technology and Industry for National Defense.
That evening, General Ding Gaoheng, director of the Science and Technology Commission, convened experts in the aviation field in Beijing and held a small but high-level internal symposium.
Of course the invitees also included Du Yishan and Liu Zhenxiang who were on Beijing Airlines.
As academicians, the two of them were naturally provided with special cars, but Liu Zhenxiang's organizational relationship was still with Institute 624, so he had to squeeze into the back seat of the same car as Du Yishan.
"You are quite well prepared."
Du Yishan glanced at Liu Zhenxiang, who was carrying a bulging briefcase.
The latter put the bag casually between the two of them and said with a smile:
"Your precious student, the commotion caused by this time is not small. There was a big noise in Fucheng last night. I already called and told me that I was going to apply for a standard review, but I didn’t expect that the Science and Technology Committee would be directly alerted.” I knew first, but in the end it was me, the mentor, who was kept in the dark.”
Du Yishan had a cold face, but the joy in his tone could not be hidden at all.
It’s like a child who just got a new toy. Although he talks about it, he still can’t help but take it out and wave it in front of his friends.
And he also deliberately pretended to be casual.
There is no doubt that Liu Zhenxiang is the friend whose face was dazzled:
“Okay, okay, I know you have a great student, let’s wait for the matter over at 624 Institute to be dealt with After that, I also transferred my organizational relationship back to Beijing Airlines as a professor..."
"Actually, when Chang Haonan officially studies for a Ph.D. next year, you can also be his associate tutor." Du Yishan looked sly.
"Go, go, go, is that the same thing..."
Liu Zhenxiang suddenly regretted that he had just rejected the proposal of the Science and Technology Commission to send a car to pick him up, and chose to go with him. Take a car.
But then again, since that Chang Haonan has also shown extraordinary abilities in the field of aviation power, it seems that it is not impossible to have a name?
Of course the deputy tutor is nameless and unpleasant, but if I can be a joint training tutor...
That can be considered at least half a student.
Looking at the street scene speeding past 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 Committee of Science and Industry.
The number of participants was not large, and they were only seated in two rows.
There was only a bottle of water in front of everyone and no meeting documents.
It was not until about ten minutes after the scheduled start time of the meeting that two staff members finally walked in in a hurry and handed a black briefcase to Ding Gaoheng, who was sitting at the head of the conference table.
“Comrades, we only received the report at noon, so today’s symposium is indeed held in a hurry.”
Ding Gaoheng said, taking out two documents from his briefcase and writing them down respectively. He handed it to the first person on his right and left:
"These two copies were just brought over from Fucheng by the confidential officer, "Guidelines for Evaluating the Imported Total Pressure Distortion of Aviation Turbojet and Turbofan Engines" "Since I am in a hurry and have not had time to print more copies, I would like to ask all the experts to circulate it first. Comrade Liu Zhenxiang will also introduce the relevant situation to us later."
With the current status of everyone in the conference room, it is rare to encounter things that need to be circulated, but it also illustrates the importance of this matter from the side.
"Total pressure distortion evaluation..."
"I remember it seems to be GJB/Z64-94?"
"Yes, but that standard really has no operational value ..."
"..." When Ding Gaoheng said 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 did not know what the specific content was.
About twenty minutes later, the file was finally transferred to the end.
The conference room became quiet.
Same as Yan Zhongcheng before, although there is not enough time for everyone to read the contents, for these industry insiders, they can probably judge the value of this thing with just a few glances. .
"Ahem..."
Liu Zhenxiang coughed twice:
"This guide was compiled by the 606 Institute during the high-altitude bench test of the improved turbojet 14 engine. , and they are now conducting air intake distortion tests according to the steps.”
“We know that the year before last, we issued our own national standards based on the introduced American standards, but in specific terms. In terms of engineering applications, the 1994 standard still has some shortcomings.”
“For example, we don’t know what impact different forms of distortion spoilers can have on compressor stability. The same distortion spoiler can. How much steady-state and dynamic distortion intensity is generated, and whether the integration time scale has an impact on the stability margin..."
“This guide issued by the 603 Institute based on the turbojet 14 engine testing experience addresses the issues of ambiguity in the 1994 standard and incompatibility with my country’s aviation industry system at both the operational and theoretical levels. Supplement and correction."
"..."
Hearing this, even Ding Gaoheng, who was sitting in the first place, showed a helpless smile.
The formulation of national military standards requires approval from the Commission of Science, Technology and Industry for National Defense.
In the early 1990s, faced with an almost blank standard system in China, the biggest problem faced by the Science and Technology Commission was not even that it didn’t know how to establish standards, but that it simply didn’t know what standards needed to be established. .
Therefore, the principle at that time was to ignore the specific content first, rely on borrowingism to occupy the pit, and establish a standard system.
To give an analogy, it is probably like building a library from scratch. Because I have no experience, I have to follow the example of other libraries and first determine the book classification method and the required titles. As for the specific books, I can figure it out later. Complete it slowly.
In this case, Liu Zhenxiang’s comment that GJB/Z64-94 “still has some shortcomings” really saved the Committee of Science and Industry enough face.
After all, it is actually a shell, equivalent to a fake book placed on the bookshelf to occupy a place...
“I think this guide already has strong operability. , you can consider sending an expert team to the 624 institute to confirm the ground test results of the turbojet 14, and rely on the content of the guide and existing engineering experience to modify the operation and evaluation specifications in GJB/Z64-94 to better carry out distortion Research on Experimental Assessment Technology”
This kind of internal small-scale symposium was relatively casual, and Liu Zhenxiang's status in the field of aviation power was very transcendent, so he did not make any twists and turns, but directly expressed his attitude after the introduction.
“I think the person who wrote this guide did not want to revise the old standards.”
As soon as Liu Zhenxiang finished speaking, the person sitting at the end of the conference table Another expert expressed a different opinion.
He flicked the document in his hand:
“Because I am the last one here, I take advantage and have more time to read than all the comrades.”
"The 1994 standard was formulated based on the ARP and AIR series of general specifications. It has a strong British and American style in the evaluation method. For example, it uses a distortion network to simulate a typical distortion flow field and studies the impact of distortion on stability by describing the maximum instantaneous distortion. The impact of this method is to establish the relationship between compressor surge or stall and the maximum dynamic distortion. "
"On the one hand, this method is very costly and cumbersome. On the other hand, it is inconsistent with my country's existing aviation. The engine design system is also poorly coordinated.”
“But the guide we just looked at has a completely different idea. It uses the turbulence degree in the engine inlet comprehensive distortion index to evaluate pressure distortion and test methods. The plug-in board simulation method proposed by Academician Liu in 1986 was also adopted, but the board type should have been optimized and discussed. "
"More importantly, in this guide. The last part also mentioned the comprehensive evaluation method of aerodynamic stability in the engineering design stage. I took a brief look at it and found that it could only be written by someone with experience in engine design. It is very instructive.”
"So this is by no means a tinkering with the 1994 standard. We should treat it as a brand-new standard that belongs to China!"
(End of this chapter)