In the control room, several people who saw the results for the first time looked at each other.

Air film pore cooling is a proper black technology in this era, and the blockade of this technology by foreign countries is extremely strict, so that in the past ten years, only one paper in related fields has been published in the world - that is, the one that originally proposed the concept of air film cooling.

According to the basic principles of physics, the size, distribution, and most importantly the shape of the pores will affect the heat dissipation effect, but in the late 80s, Huaxia undoubtedly did not have the ability to conduct in-depth research.

Similar to Chang Haonan's active flutter control method, which was hidden by 603, the specific design of the air membrane holes in turbine blades is as secret to companies like Rolls-Royce, General Motors, Pratt & Whitney, or Rurika-Saturn.

I can't find a way to learn from it.

Therefore, when Yan Zhongzhong and others designed the turbine blades, they chose a very conservative round hole design.

The cooling effect can only be said to be unsatisfactory, but fortunately, the temperature before the turbine of the turbojet 14 is not very high, and the key point is that the design process is relatively simple and there will be no mistakes.

Moreover, if it is a design flaw brought out of the mother's womb, then its performance will be relatively stable, but it will be stable to a very poor extent.

But this is not the case.

So the problem is in the manufacture of turbine blades.

Or more precisely, it should be in the process of processing the air film hole.

The plant-site separation system commonly used in the aviation system does ensure that resources are concentrated in their respective key directions under the background of relatively difficult conditions, but the loose coupling and cooperation between the design institute and the main engine factory determines that there is no mutual subordination between the two parties in essence.

Although Factory 410 needs to cooperate with the work of the 606 Institute, it does not obey the latter's management.

This time, the engineers who followed Yan Zhongzhong to Fucheng were all engineers from the 606 Institute, and they generally knew little about the manufacturing process, and they were difficult to face this problem for a while.

The chief engineer responsibility system established only a few years ago was to a large extent to solve this problem, and the results were good from the later situation, but the 83 project and Kunlun engine, which had been established in the mid-80s, did not set up this team.

After all, it is rare to be able to lead the overall situation as the chief designer like Yang Bonghata.

Not only do you need to have enough prestige, but more importantly, your superiors must be willing to support you in the back.

"Xiao Chang, I remember that you should have been to Factory 410 before coming to Fucheng this time, and did you find any problems, I mainly refer to...... At the management level? ”

After a long while, Yan Zhongzhong asked.

Of course, he himself often goes to the 410 factory, but as the chief model engineer and the "leader of the brother unit", the goal is too big, and even if he goes, he may not be able to see anything.

Chang Haonan shook his head:

"Of the two engines newly assembled, only the casing and compressor are newly built, and the combustion chamber and turbine behind are all previously produced parts, at least from the perspective of the production and assembly process of the compressor blades, it can be regarded as well-organized."

He suddenly remembered the pile of blades in the scrap area of the workshop.

That afternoon, when he was in the restaurant in the production workshop, Zhong Shihong once talked in detail about the manufacturing and testing standards of compressor blades.

Although I can't remember the specific data, the other party said that these standards were determined after nearly 30 years of exploration.

So he opened his mouth and added:

"The manufacture of air film holes is completely new to our aviation manufacturing field in China, and I think it is possible that they have overlooked some of the key points."

The atmosphere fell silent again.

Theoretically, this is not a flaw serious enough to be fatal.

But the people here had just experienced that exhilaration, a joy of finally turning over and singing to the serfs.

A second-generation engine was stunned to come up with a performance close to that of the third-generation turbofan.

The turbojet 14 in front of me is the baby bump in the hearts of everyone in 606 at present.

Even if there is only a 1 in 10,000 chance that something will go wrong, everyone wants to eliminate the possible hidden dangers.

Once bitten by a snake, he was afraid of the well rope for ten years.

The Turbojet 14 has experienced too many ups and downs.

It would have been nice if they had been in the dark, but now they have seen the light of hope.

No one wants to lose it again.

"Perhaps, we can ask Factory 410 to send the prototype No. 02 that has been assembled to be tested, maybe it is an isolated case?"

Finally someone spoke.

"Can you also try a new high-pressure turbine?"

“……”

Listening to the increasingly noisy discussions around him, Chang Haonan suddenly realized a problem.

It seems that everyone's focus is a little off.

The person who wanted to find out the reason for the unstable working condition of the engine at the beginning was indeed himself.

But now these people around me seem to be more obsessed with eliminating hidden dangers.

Well...... Paranoia, perhaps, or fanaticism.

It's a bit similar to Yao Mengna from the previous period.

Only this time there is a real possibility that it will lead to delays.

In fact, Chang Haonan's biggest concern before was that there were structural defects in the engine that he couldn't know.

If that's the case, simply improving the surge margin to treat the symptoms will certainly not work.

So after really identifying the problem, he himself breathed a sigh of relief.

First, it has been proven that this problem is not fatal, and secondly, subsequent production improvements will not affect the task of finalizing the design.

If conditions permit, he is of course willing to continue to dig deeper and satisfy the perfectionist plot in his heart as a scientific researcher.

However, there is no such thing as perfection in engineering, and it must be considered comprehensively in combination with the actual situation.

Even rockets for manned space flight have an overall reliability of only 99.8% instead of 100%.

The risk is not terrible, but the risk is terrible when it is out of control.

Moreover, for the turbojet-14, a power that can be used on the J-7 and J-8 main fighters, the delay in progress itself is a risk.

The choice between safety and efficiency is like walking a tightrope.

The layer of window paper between bold and blind brutality was still placed in front of Chang Haonan after all.

Perhaps even he himself has not realized that he has unconsciously begun to think about problems from the perspective of overall project management.

……

"It seems that it would be more appropriate for Yan Zhongzhong to come forward and talk about this matter?"

Looking at the people who were discussing enthusiastically, Chang Haonan was a little hesitant.

If he had left it to work, he would probably have made such a decision eventually.

But this time, there seemed to be something different, constantly urging him in his mind.

"Comrades, the high-altitude platform test cannot be interrupted and should continue as planned."

Chang Haonan stood up almost uncontrollably and said this.

So much so that he heard a familiar voice first, and then realized that he had opened his mouth.

The eyes in the control room all looked at Chang Haonan, who was the only one standing.

Including Yao Mengna.

(End of chapter)