Chapter 1029 Does the Trent 900 Have a Design Flaw?

That evening, the R&D team, which had been officially named the "Trent 900 Turbine Production Project Team", held its first project seminar attended by all major members.

"Comrades, I think there is no need to emphasize the importance of this mission to Haofei and the entire group."

Chang Haonan opened the game and went directly to the topic:

"The production contract given to us by Rolls-Royce includes two parts. One is the relatively traditional high-pressure turbine. I briefly looked at the information on this piece in the afternoon. It is an upgraded model of the aviation materials used in the RB211-524B4. It can be found at Build on previous experience.”

He pulled out a piece of paper from the folder in front of him:

"Moreover, after preliminary testing by the technical department, the turbine blades given to us by the British are semi-finished blanks. The blade crown part has not yet been processed, and the surface has not been coated with a heat-insulating coating..."

Obviously, as an established company, Rolls-Royce is still on guard against some particularly sensitive parts.

Although hiring someone to process it will inevitably reveal some confidential information, by removing the two key details of the turbine structure, the detailed design parameters of the blade tip and the material used for the heat-insulating coating, it can at least prevent China from replicating a Trent 900 as it is. —

By 2002, very few Western companies dared to say, "You can't even make technology if you leave it to them."

"Of course, everyone is just doing what they need in business, and it's normal to keep one hand."

Chang Haonan is very open-minded about this:

"Moreover, such semi-finished blanks are easier to handle. Firstly, there is no need to consider coating issues, and secondly, the clamps can be directly fixed on the blade ends and blade roots, without even redesigning..."

"In general, this part of the work is to find suitable processing parameters based on the properties of the new nickel alloy material. The workload may be a little bit, but it is basically step-by-step."

When they first heard this, everyone, especially Zhang Zhenhua, couldn't help but heave a sigh of relief.

As a result, Chang Haonan's next words made them stop laughing:

"So, now that I have accumulated previous experience, I am ready to leave it to you to do the high-pressure turbine..."

After finishing speaking, the former held his chin with both hands and glanced flatly at the many faces in front of him.

And stayed in several locations for a period of time.

It’s like thinking about who to pick as the lucky listener…

In an instant, the temperature in the conference room seemed to drop a lot.

Although Chang Haonan's expression is still warm, in the eyes of others, he looks like the head teacher who appeared outside the back door window of the classroom when he was at school...

"Chang...Mr. Chang."

Zhang Zhenhua subconsciously looked around and felt that there was a high probability that this matter would fall on him, and he inevitably felt a little guilty:

"I think...should it settle down a little more?"

You can't blame him for being slow to comprehend.

When the turbofan 10 production was finalized, Chang Haonan himself started the research from scratch. Although the 606 Institute may not have been able to keep up with the pace at the time, it at least went through the whole process.

It's amazing that you can slowly understand it after you go back.

But when it came time to trial-produce the RB211 turbine blade sample, not only Chang Haonan himself was already very proficient, but even the senior staff who came to support from the 606 Institute had already experienced the two models of turbofan 10 and M88-3.

So the progress is actually very fast.

You know, Luoluo felt like almost 40 days had passed, but in fact, for Haofei, after receiving data, docking requirements, and several rounds of trial production, it only took a month.

In addition, Zhang Zhenhua was born in Factory 430, so his foundation is already weaker.

It’s normal to feel unsure.

However, Chang Haonan knows very well that if you don't push some people hard, they will never reach their limits.

Moreover, he happens to be in Haojing right now, so even if something goes wrong, he can easily cover it up.

If Zhang Zhenhua had to wait until the end of this project to start taking the lead, the cost of error correction would be high...

"Old Zhang..."

Chang Haonan said in a half-joking tone:

"We have two production tasks on hand. The other one is a low-pressure turbine using high-temperature resistant titanium alloy. This type of material is almost completely blank for us."

"Originally, I planned to be responsible for the latter part myself, but if you really don't want to, then we can change it..."

It can only be said that the roof-lifting theory is indeed useful sometimes.

Zhang Zhenhua, who was numb, immediately shook his head:

"No, no, no... Then I'd better take charge of the high-pressure turbine part..."

The conference room was suddenly filled with cheerful air.

However, you can't just squeeze it out at this time.

Definitely still need to give some support.

So, after the laughter gradually subsided, Chang Haonan continued:

"In addition, I will ask Comrade Chen Zhongsheng and Comrade Zhong Yi to join you as technical consultants. They are already relatively experienced in the process development of nickel-based alloy materials."

"I believe that with the cooperation of the three of you, we will be able to properly solve the production problem of high-pressure turbines..."

The two names he called were from the 606 Institute and Liming Factory respectively. They were both technicians selected by Liu Yongquan to support the work of his brother units.

And, if nothing else happens, Zhong Yi will still stay in a leadership position with Hao Jing even after the project ends.

"Then thank you, Mr. Chang..."

Zhang Zhenhua's originally pale face turned a little red.

Chang Haonan waved his hand and then switched directly to the next topic:

"The next part is about the low-pressure turbine..."

Having said this, he also slightly adjusted his posture and sat up straighter.

This means something like "I'm going to get serious.jpg".

Following Chang Haonan's actions, dozens of people in the entire room became serious.

"In fact, under normal circumstances, the operating temperature of low-pressure turbines is relatively low, and the heat dissipation requirements are not strict... However, the situation of the low-pressure turbine of the Trent 900 is quite special."

This time, he no longer gestured directly in the air, but turned on the laptop and projector next to him.

A design drawing marked with many data was quickly displayed on the screen.

But it is not the blade part that is the top priority.

But the turbine disk.

Or strictly speaking, it is the part where the turbine disc and turbine shaft are connected.

"In the case of the low-pressure turbine, the difficulty is on the one hand the material issues I just mentioned. We have never done it before and are not familiar with it. On the other hand, the design of this turbine is rather... strange."

Chang Haonan considered the words for a long time, and finally found a more euphemistic way of saying it.

"It may be because the three-rotor structure itself has made the rotating shaft part very complicated, or it may be for other reasons. In short, Rolls-Royce did not provide an anti-overrotation design for the Trent 900 in the low-pressure turbine part... and although there is not enough information , but I doubt they even have one on the medium-pressure turbine side..."

"Normally, this will not have any impact, but once a fault occurs and the turbine shaft breaks, the medium-pressure and low-pressure turbines that have lost their load will rise sharply in speed driven by the airflow, until the blades cannot withstand the huge centrifugal force. Being thrown out of the engine..."

As an aviation designer, Chang Haonan inevitably has some occupational diseases.

In short, it looks awkward no matter how you look at it.

The key is that he does not have complete technical information on the Trent 900 and does not know how Rolls-Royce plans to solve this hidden danger.

Or are they really confident that their engines will not have shaft breakage problems?

"Speaking of this, Mr. Chang."

Ren Bingda suddenly interrupted:

"When I was communicating with Ciro Company before, I heard Mr. George Breen mention it accidentally."

"He said that those responsible for the production of Trent 900 engine turbine shafts and turbine accessories are Ishikawajima Harima Heavy Industries and Kawasaki Heavy Industries..."

"Ahem——"

Chang Haonan almost lost his temper.

I wanted to laugh, but I felt it wasn’t appropriate.

As a result, I choked on my saliva...

In fact, IHI and Kawasaki themselves were not involved in the quality crisis among Japanese companies that year.

However, after experiencing such an incident, Luo Luo still dared to choose them as a supplier. All I can say is...

The courage is commendable.

"Forget it, let's do our own thing first..."

Chang Haonan stopped his smile and waved his hand towards Ren Bingda:

"In short, what is relevant to us is that the density of air film holes in the part where the turbine disc and turbine shaft are connected is larger than that of ordinary models, and the requirements for stress control and defect control during the processing are also higher... …”

"..."

Chang Haonan spent about three hours briefly introducing his R&D plan and the specific directions that each group is responsible for.

It has to be said that this is a challenge even for him.

Mainly it’s a matter of construction period——

On the surface, Luo Luo wanted to take it easy this time.

They even specifically requested that the contract signing date be written to December 2002.

The delivery of samples must not be earlier than signing the contract, so it was pushed to before April 2003.

This works out to nearly 8 months.

The schedule seems to be very generous.

But Chang Haonan knew that an unexpected incident was likely to occur in early 2003, which would affect the entire work progress in the first half of next year.

If you exclude this part, there are only four months left.

Excluding the fact that Perelman could not be contacted for a while, the International Congress of Mathematicians was postponed to the end of the year...

There are only three and a half months left...

We still have to race against time.

…

After assigning tasks, the seminar came to an end.

Everyone went back to rest for a night, and then officially started work the next day.

Chang Haonan, however, stopped Ren Bingda alone who was about to leave:

"Old Ren, wait a moment."

The latter had just raised his butt halfway before sitting back on the chair:

"Mr. Chang, please tell me."

Chang Haonan reached out and tapped on the high-temperature titanium alloy material in front of him, and said in a deep voice:

"You are a local, so you should be familiar with the situation at Hao Jiaotong University and Hao University of Technology."

"After I go back, think about it and see if there are any scholars who are relatively reliable and have decent level of skills in metal materials research. When the time comes, we will bring them. Of course, I will also find some comrades who meet the requirements from the 621 Institute and bring them to us. Come to the project team.”

Ren Bingda didn't reply, just showed an "I understand" smile, and then nodded.

According to the contract signed between Xiluo Company and Haofa Group, Party B shall not hand over the technical information about Trent 900 to any third party organization or unit without Party A.

Of course, this is just a sentence that must be added to the contract template.

The actual situation is that Luo Luo knew that Gaofa Group would definitely use the information for reference.

Gaofa Group also knew that Luo Luo knew that he would use the information for reference...

However, for such things, knowing it in your heart is knowing it in your heart.

Still, you can't do it too ugly.

So Chang Haonan is not going to openly violate the regulations -

Not handing over the information to a third party is fine.

But if I invite someone from a third party to join our project team, you can't control this...