Half an hour later, with the soft entrance music, the first Huaxia Aero Engine Industry Conference was officially opened.

Chang Haonan, who could only sit in the back row to listen to this kind of meeting in the past, was naturally invited to the middle of the first row as the most important guest and conference planner this time.

sat with Liu Zhenxiang, who was also specially invited.

Originally, the conference was going to arrange for him to make the first paragraph of the report immediately after his speech, but Chang Haonan said that the content he prepared was too long and too formal, and it was better to put it in the finale.

This also maintains a sense of anticipation among the participants to a certain extent.

He had read the reports prepared by several other people before, and in terms of the current level of development in the field of Huaxia aviation power, it can be regarded as a very high level, and many of the conclusions were achieved after the 21st century in the previous life.

Although they are all breakthroughs in very subdivided directions, so they are not a leap forward, but in terms of research ideas and research methods, they can definitely inspire researchers in other fields.

And if Chang Haonan throws out his blockbuster content first, then I'm afraid there won't be a few people who care about these things anymore-

You have to leave some opportunities for others.

Therefore, after a brief summary of the achievements made in the field of aero engines in the past year, Chang Haonan generously gave the first opportunity to officially come to power to Academician Liu Zhenxiang next to him.

Although the latter is also a Taishan Beidou-level figure in the industry, the main content of his report is about the Huaxia aero engine industry standards that are currently in the process of being formulated, especially the relevant standards in the plateau environment of 3000 meters and above, and there is not much overlap with the following reporters.

"Due to the special geographical and topographical conditions of China, a considerable number of airports in key directions are built in the plateau and high plateau areas, which is a situation that almost no other country has faced, therefore, a plateau condition standard that meets the requirements of our national conditions will undoubtedly be of great significance for China's national defense security and flight safety of the civil aviation industry......

“……”

As Liu Zhenxiang's report came to an end, Chang Haonan also lowered his head, ready to sort out the main points he had just written down.

But at this moment, he suddenly heard his name.

"In the end, I would like to give special thanks to Comrade Chang Haonan."

Chang Haonan almost subconsciously raised his head, and then found Liu Zhenxiang behind the podium staring at him with a smile.

"If it weren't for the fact that he submitted a key technical document to his superiors at the critical moment of the high-altitude test of the turbojet 14 engine, I am afraid that the entire aviation industry standard content that we see today would not have appeared, and the series of new projects and models derived from it would undoubtedly not exist."

As soon as these words came out, the audience was in an uproar.

The large-scale revision of aviation-related clauses in the national military standard is a matter that has been very dynamic since the second half of last year, and it is also closely related to the projects of almost everyone here, so naturally no one is unaware.

But for a long time, there are not many people who know the specific inside story.

Everyone only understands that the whole thing started when the aero-engine quality acceptance standard GJB/Z64-94 was suddenly revised to the new GJB/Z64-97A.

This is definitely something that everyone expects, after all, the original set of standards copied from the Americans is completely unsuitable and lacks operability, and since its release more than two years ago, let alone passing the test, no one can even explain how it should be tested.

Now it is a great pleasure to change to a set of new standards that are comparable in strictness, but I can't wait to tell you which screw is turned a few times during the test.

It's just that before today, not too many people knew that the core content of GJB/Z64-97A was almost completed by Chang Haonan alone.

After a few seconds, the entire venue finally reacted and began to give Chang Haonan thunderous applause.

Since the scene had come to this point, the latter had no choice but to stand up, turn around and gesture slightly to the back.

However, Liu Zhenxiang seems to have made a not-so-good start.

The content of the report on this aviation industry conference is actually more or less related to Chang Haonan.

Now even Academician Liu has specially expressed his gratitude, so do other people still have a reason to bring it out and talk about it?

So everyone has to say a sentence at the end of the report, or a rainbow fart.

Chang Haonan had already read all the contents of the report, so his original plan was to wait for Liu Zhenxiang to finish speaking, then sneak out to rest, and then return to the venue when it was his turn.

As a result, the eyes of the audience had to focus on him every once in a while, and there was no chance at all.

Since the conversion of standards, even if the old standards are not implemented at all, it is quite complicated to only involve the conversion of paper content, so Liu Zhenxiang distributed a lot of less important content in the form of vertical topics to some project teams with sufficient confidentiality.

Although the funds are not large, it is almost a lifesaver for many people.

And many of you here today have benefited from that.

It is no exaggeration to say that Chang Haonan can be regarded as half of their food and clothing parents.

Therefore, even during lunch and recess, waves of people came to the front to express their gratitude or admiration to Chang Haonan......

……

When the meeting process finally proceeded to Chang Haonan's stage, he even felt a little relaxed.

The applause lasted a little longer than the previous ones.

Chang Haonan stretched out his hands and pressed down, which made the audience quiet again.

"Comrades, what I am going to talk about today is more formal."

Chang Haonan said and clicked on his first page of PPT and projected it onto the screen:

Full 3D Design and Unsteady Analysis Method of the Third Generation High Thrust Turbofan Engine

The moment this title appeared, the entire venue fell silent in an instant.

This was followed by the clatter of almost brushing open the notebook.

Everyone is in the industry, and everyone understands what the description of "third-generation high-thrust turbofan engine" means.

You must know that the successful finalization of a second-generation turbojet engine last year injected a huge amount of money and vitality into the field of aviation power that was unimaginable in the past.

And now this is clearly to move the turbofan 10 from the pre-research stage to the real project.

If you can participate in it, it is immeasurable whether it is the improvement of your ability, resume or network.

So everyone immediately cheered up.

Seeing that everyone was ready, Chang Haonan officially started his report:

"Today's previous speakers have introduced in great detail some of the most cutting-edge research in the field of aero engines in China, and I am very pleased to see that after the successful completion of the design and production finalization of the turbojet 14, our aviation development research has not stayed in place, but has been further pushed to a new height by you......

After affirming his previous work, he changed his conversation and went straight to the point:

"But that's not enough, comrades."

"Everyone must have known more or less that our two domestic third-generation fighters, the medium-sized Project 10 and the heavy Project 11, are progressing smoothly, and in fact, if it weren't for the recent weather, it might even have completed the first flight."

"But these two types of aircraft, in terms of aviation power, are still imported from Russia AL31F engines, of course, in the current situation, the Russians should not be like the Americans, to cut off the supply of engines to us, so in a short time, there is no need to worry about the problem of stuck neck."

"However, we people engaged in aviation have already had too many historical lessons, in the final analysis, it is better to have a father and a mother than to have oneself, whether it is from the perspective of saving foreign exchange for the country, or from the perspective of ensuring the independent development of national defense capabilities, we need to develop a new type of aviation power that is sufficient for the third generation of fighters!"

"Of course, in all fairness, with the technology we have mastered now, to make a turbofan push with a push ratio of more than 8, from design to manufacturing, there are problems almost everywhere, but I think it doesn't matter, it is difficult to pass the pass, all the difficulties, are step by step, and the content I want to focus on today, but also the starting point of a new model of aero engine, is a new design theory!"

Speaking of this, Chang Haonan clicked the mouse again, and a formula familiar to everyone appeared on the curtain.

N-S equation.

"As we all know, the N-S equation is the most universal differential equation in fluid mechanics calculation, and it is also the basic physical model for studying the internal flow mechanism of compressors, but due to the lag of related research technology development and the imperfection of people's understanding of the flow mechanism, this equation needs to be simplified corresponding to the engineering requirements, and a series of design methods and theories have been derived."

"Before the aerothermodynamic theory of turbomachinery was formally formed, the aerodynamic design of the impeller has always adopted a one-dimensional flow method, but this has little to do with the topic we are going to talk about today, because the simplification is too serious, and there is little value in engineering practice."

"The design theory we are currently using is based on two assumptions, the S1/S2 flow surface quasi-3D analysis design theory, which is based on two assumptions, both constant and partially considering the influence of viscosity, and transforms the three-dimensional flow solution problem of the compressor into two iterations of two two-dimensional flow problems. In this theory, the flow from the root of the blade to the tip of the leaf in the compressor channel is simplified to the flow on a certain S2 flow surface, and the flow between the blades is simplified to the flow on an S1 flow surface, and the three-dimensional flow field solution is obtained through the mutual iteration between the two types of flow fields. So far, this is also the mainstream design method applied in developed countries in Europe and the United States. ”

"Originally, this should be the most advanced theory we can use."

Chang Haonan showed a smile and gently tapped the podium in front of him:

"But I was lucky, a few months ago, I stumbled upon a completely new method for reducing the dimensionality of nonlinear partial differential equations."

The originally solemn atmosphere suddenly became a lot more relaxed, and there was a light laugh from below.

Everyone knows that this kind of thing, of course, is not entirely done by luck.

It's just that Chang Haonan is willing to be so modest, and naturally no one can break it.

"This new method of numerical solution to partial differential equations, combined with the multiphysics simulation modeling software that I have also recently developed, especially the new mesh generation technology, provides us with a whole new possibility."

The screen shows the TORCH Multiphysics software interface.

"A complete viscous simulation calculation is introduced into the design system, and the flow field structure can be analyzed and evaluated according to the calculation results, and improvement measures are proposed in time. This method can not only accurately ensure that the designed compressor has high efficiency and wide surge margin, but also reduce the number of iterations in each design stage, reduce the dependence on research test components in the research process, and even directly enter the whole compressor test. ”

"According to the rules of several methods in the past, I named this theory - full 3D design and flow analysis!"

(End of chapter)