Chapter 987 Multi-stage adjustable stator blade matching technology

In Chang Haonan's opinion, with the precedent of QC130, it should not be particularly difficult for the navy and shipbuilding industry system to accept the QC606, which is also designed by the 300 Institute and uses the same aero-derivative fuel.

It is highly likely that Yan Zhongcheng made this trip just to seek safety.

"Speaking of which, Mr. Yan."

After finishing the discussion on gas turbine selection, Chang Haonan couldn't send the guest away right away, so he took this opportunity to talk to the other party about the issue of aviation fuel reform project establishment:

"As for the specific research and development of QC300, my idea is... if you are healthy, you will continue to take the lead."

Upon hearing this proposal, Yan Zhongcheng was shocked and a bright light flashed in his eyes.

Due to relatively complex historical factors, his efforts to become an academician last year failed.

In fact, he no longer had any thoughts about this matter.

But QC300 is a project purely initiated and developed by Aviation Power Group.

If I could be the chief designer...

It is definitely a great help in breaking through to the academician level.

But in a flash, he had some concerns:

"This……"

Yan Zhongcheng glanced at Chang Haonan:

"Thanks to the organization's care, I haven't had much burden in the past two years since the QC130 was finished. I have had a lot of rest, so I'm sure there's nothing wrong with my body."

"It's just that... after all, you know more about the WS-10, and you developed the entire core engine yourself..."

In other units, leaders always take advantage of others halfway.

As a result, when it came to him, he actually picked the peach of the leader.

Although Chang Haonan did have more than 100 million peaches in his hand.

But it's still weird.

At least I feel guilty.

However, before Yan Zhongcheng could finish his words, Chang Haonan waved his hand:

"The WS-10 core engine will have a wide range of uses in the future. I have a lot of things to do, and it is impossible for me to handle every project personally. If I do that, I will have no time to do anything else."

"So... my main focus from now on should be on the high bypass ratio turbofan. Also, after the high temperature alloy technology is improved, the potential of the WS-10 as a fourth-generation core engine will be released."

"Although both aviation power and ship power are essentially combustion engines, there are still significant differences when it comes to engineering. In this regard, you, President Yan, are the only one in our group who has the successful experience of QC130, and you will definitely play an important role..."

Yan Zhongcheng didn't really want to do it, but he had some psychological burden, and he had not directly participated in the development of WS-10, which made him feel unsure.

Now that Chang Haonan has said so, he can't continue to refuse.

So after a little hesitation, he nodded.

“Don’t put too much psychological pressure on yourself.”

Chang Haonan laughed when he saw this:

"I don't want to be a hands-off manager. I still have to take responsibility for the overall work..."

What this means basically 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, that is mainly due to different division of labor.

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

If someone like Chang Haonan becomes the chief engineer, he will basically play the role of a stabilizing force and providing technical support.

"Please don't scare me, Mr. Chang..."

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

"To be honest, the other parts of the WS-10's aero-derivative combustion are all fine. I can either understand them or, like the combustion chamber, I can just use the test results as known items. The only thing is the design of the high-pressure compressor. After reading the design plan, I am still confused..."

Although the aviation-derivative fuel is developed based on the aero-engine core, the working conditions are very different, so the only parts that change slightly are often the combustion chamber and the turbine.

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

Especially after the introduction of indirect cooling and heat recovery technology, thermal management will become more complicated.

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

"Don't worry about this."

Chang Haonan leaned back on the sofa pretending to be relaxed:

"The QC300 has a good foundation, so it is not difficult for the model to last for decades. There is no need to achieve success all at once and pile all the technologies on hand on it."

"As a first step, we can build a simple cycle gas turbine to solve the most pressing problem of users, and then gradually add other cash technologies to gradually upgrade."

"Also, regarding the compressor part you just mentioned..."

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

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

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

"You continue."

Looking at the opponent's smooth little combo, Chang Haonan showed a helpless expression:

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

Having said that, Yan Zhongcheng's things had already been placed on the coffee table, and it was impossible for him to ask someone to put them away.

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

"You look confused because you don't know where to start. I can actually explain to you how the high-pressure compressor of the WS-10 is designed, including the margin left for upgrading to the fourth-generation engine with a thrust-to-weight ratio of 10. These parts are actually not very difficult..."

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

"I suggest that you change your perspective, Mr. Yan. Throw aside all parts except the combustion chamber and turbine, and design an axial compressor from scratch based entirely on the characteristics of ship-borne engines. This way, there will be fewer constraints and it will be more effective in training the technical team."

Yan Zhongcheng stopped writing thoughtfully, stroking his chin as he thought about what Chang Haonan had said.

"For example, compared to aircraft engines, marine gas engines are less sensitive to weight, but may need to operate at lower conditions for a long time, especially if they adopt full fuel power in the future."

"Therefore, we can try to adopt an adjustable stator blade control strategy at the design level of the 7-stage high-pressure compressor. By changing the stator blade angle, we can provide an ideal angle of attack for the rotor of the subsequent stage and establish an inter-stage matching condition that is suitable for the load of each operating condition. This will allow the engine control system to automatically select the most appropriate stator blade angle for different operating conditions, thereby improving the surge boundary and working efficiency."

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

"In general, before officially launching the project, you can 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 local units using other types of gas turbines to compile a model library for performance prediction."

"This way, when we need to build a variable-dimensional gas turbine model later, at least we don't have to reinvent the wheel from scratch..."

"Also, from a cycle perspective, simply placing an intercooler between the high-pressure and low-pressure compressors will have relatively little impact on the cycle itself, but it can significantly reduce the compression power consumption of the high-pressure compressor. If there is enough capacity, you can consider taking the lower intake temperature into account when designing the high-pressure compressor..."

"..."

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

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