The Military-industrial Scientific Research System of the Academic Master Chapter 987

Chapter 987 Multi-level adjustable vane matching technology

In Chang Haonan's view, after the precedent of QC130, it should not be particularly difficult for the navy and shipbuilding industry to accept the QC300, which is also designed by 606 and also uses aeroderivative fuel.

Yan Zhongcheng's trip was most likely just for stability.

"Speak of it, Mr. Yan."

After talking about the serious matter of gas turbine selection, Chang Haonan couldn't see off the passengers right away, so he took this opportunity to chat with him about the establishment of an aeroderivative gas turbine project:

"My idea for the specific research and development work of QC300 is...if you have no physical problems, you will continue to take the lead."

Upon hearing this suggestion, Yan Zhongcheng's whole body was shaken, and a bright color flashed in his eyes.

Due to relatively complex historical factors, his efforts to challenge academicians failed last year.

Originally, he actually no longer thought much about this matter.

But QC300 is purely a project developed by the Aerospace Power Group.

If I could serve as chief designer...

It is definitely a big help to break through the academician realm.

But in an instant, he had some concerns:

"this…"

Yan Zhongcheng glanced at Chang Haonan:

"I asked the organization to take care of me. In the two years since the end of QC130, I haven't had a lot of burdens. I have been able to recuperate a lot. There must be no physical problems."

"It's just...after all, you know better about the situation of Turbofan 10, and the entire core machine was developed by you..."

In other units, leaders pick peaches halfway.

As a result, when he got here, he actually picked the leader's peach.

Although it is true that Chang Haonan has more than 100 million peaches in his hand.

But it's still weird.

At least guilty.

However, before Yan Zhongcheng finished speaking, Chang Haonan waved his hand:

"The core machine of Turbofan 10 will be used in a wide range of applications in the future. I have many things to do. It is impossible to handle every project personally. Then I will have no time to do other things."

"So... my main focus next should be on the high-bypass ratio turbofan, and then wait until the technology of high-temperature alloys is developed to unleash the potential of the turbofan 10 as a fourth-generation core machine. come out."

"Moreover, although aviation power and ship power are both gas turbines in essence, when it comes to engineering, the difference is still quite big. In this regard, only Mr. Yan in our group has the successful experience of QC130, and you will definitely play an important role. of…"

Yan Zhongcheng didn't really want to do it, but he was just a little bit mentally burdened. In addition, he had not directly participated in the research and development of the turbofan 10, which made him feel unsure.

Now that Chang Haonan has said so, it is impossible for him to continue to refuse.

So after hesitating for a moment, he nodded.

"Don't have too much psychological pressure."

Chang Haonan laughed when he saw this:

"I don't want to be a completely hands-off shopkeeper. I still have to be responsible for the work of grasping the boss..."

What this basically means is that he will still serve as chief engineer.

Although in most cases, the chief engineer does not interfere with the technical details of the project, this is mainly due to the different division of labor.

As the top decision-maker and person in charge of the project, if the chief engineer is willing and capable, he can of course intervene in the design work when needed.

If someone like Chang Haonan were to be the chief engineer, he would basically play the role of a stabilizing figure and a technical backbone. "Mr. Chang, please stop scaring me..."

Hearing this, Yan Zhongcheng finally breathed a sigh of relief:

"To be honest, other parts of the turbofan 10's aeroderivative combustion are fine. Either I can understand it, or like the combustion chamber, I can just use the test results as known items. Only the design of the high-pressure compressor, I After seeing the design plan, I'm still confused…”

Although aeroderivative combustion is developed on the basis of the core aircraft engine, because the working conditions are so different, only the combustion chamber and turbine are often the only ones that change less.

Although the high-pressure compressor is also part of the "core engine", it often requires extensive modifications.

Especially after the introduction of intercooling heat recovery technology, the thermal management situation will become more complicated.

It is far from a problem that can be solved by putting a shell on the aviation engine and changing the calibration.

"There's no need to be anxious about this."

Chang Haonan pretended to be relaxed and leaned on the sofa:

"The foundation of QC300 is pretty good, so it is not difficult for the model life to last for decades. There is no need to build it overnight and use all the technologies at hand."

"The first step is to build a simple cycle gas turbine to solve the most pressing problems of users, and then gradually add other cash technologies to gradually upgrade it."

"Also, as far as the compressor part you just mentioned..."

Originally, Yan Zhongcheng had gradually relaxed at this moment, but when he heard Chang Haonan suddenly talk about technical issues, his nerves suddenly became tense again:

"Mr. Chang, wait a moment..."

He stretched out his hand to signal the latter to wait, and at the same time quickly took out the notebook and pen he carried with him from his bag:

"You continue."

Looking at the opponent's silky little combo, Chang Haonan showed a dumbfounded expression:

"Actually, I'm just providing an idea, not any specific technical guidance..."

Having said that, Yan Zhongcheng's things have already been placed on the coffee table, and it is impossible for anyone to put them away.

So, he just explained casually, and then returned to the topic:

"You seem confused, just because you don't know where to start. I can actually tell you specifically how the high-pressure compressor part of the turbofan 10 is designed, including for the fourth-generation engine that will be upgraded to a thrust ratio of 10 in the future. With the margin left, these parts are actually not very difficult..."

"But if you talk about it before the overall design of the QC300 is finalized, I'm worried that it will interfere with your thinking."

"I suggest Mr. Yan to change the angle, put aside everything except the combustion chamber and turbine, and design a set of axial flow compressors from scratch based entirely on the characteristics of naval gas engines. This will only make you more constrained. Less, and the training effect for the technical team is stronger. ”

Yan Zhongcheng stopped writing thoughtfully, touching his chin while thinking about Chang Haonan's words.

"For example, compared with aerospace engines, marine gas engines are relatively less sensitive to weight, but they may need to work under lower operating conditions for a long time, especially if full-combustion power is used in the future."

“Therefore, we can try to adopt an adjustable vane control strategy at the design level of the 7-stage high-pressure compressor. By changing the vane angle, we can provide an ideal angle of attack for the rotor of the subsequent stage, and establish a control strategy suitable for the load of each working condition. The inter-stage matching conditions allow the engine control system to automatically select the most appropriate vane angle for different operating conditions, improving surge boundaries and work efficiency.”

"In addition, marine gas turbines do not need to consider performance optimization under supersonic operating conditions, so there is no need to take into account the problems caused by too high a boost ratio. The total pressure ratio after removing the fan can be increased to 24, or even above 26 , to improve output power and fuel economy..."

"In general, before officially establishing the project, you can first consider doing some preliminary work with relatively low investment, such as using a relatively simple one-dimensional average streamline method to establish an aerodynamic parameter calculation model, and then see if you can cooperate with the Navy and other places Cooperate with units that use other types of gas turbines to compile a model library for performance prediction.”

"In this way, when you need to build a gas turbine model with variable dimensions later, at least you don't have to build the wheel from scratch..."

“Also, from a cycle perspective, simply placing an intercooler between the high- and low-pressure compressors will have a relatively small impact on the cycle process itself, but it can significantly reduce the compression power consumption of the high-pressure compressor. In this case, you can consider taking the lower inlet air temperature into consideration when designing the high-pressure compressor..."

Although Chang Haonan said before that this is not specific technical guidance, for older generation technicians like Yan Zhongcheng, things in the research and development direction are more important.

Therefore, the latter still picked up his pen and wrote down almost word for word what Chang Haonan said...

(End of chapter)

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